Military Review

Pulse detonation engines as the future of missiles and aviation

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Direct-flow impulse detonation engine. Burn and Explosion Graphics


Existing propulsion systems for aviation and rockets show very high performance, but are very close to the limit of their capabilities. To further increase the thrust parameters, which creates a groundwork for the development of the aviation rocket and space industry, other engines are needed, incl. with new principles of work. Great hopes are pinned on the so-called. detonation engines. Pulse-class systems of this type are already being tested in laboratories and on aircraft.

Physical principles


Existing and operating liquid fuel engines use subsonic combustion or deflagration. A chemical reaction involving fuel and an oxidizer forms a front that moves through the combustion chamber at a subsonic speed. This combustion limits the amount and speed of reactive gases flowing out of the nozzle. Accordingly, the maximum thrust is also limited.

Detonation combustion is an alternative. In this case, the reaction front moves at supersonic speed, forming a shock wave. This combustion mode increases the yield of gaseous products and provides increased traction.

The detonation engine can be made in two versions. At the same time, impulse or pulsating motors (IDD / PDD) and rotary / rotating ones are being developed. Their difference lies in the principles of combustion. The rotary engine maintains a constant reaction, while the pulse engine operates due to successive "explosions" of a mixture of fuel and oxidizer.

Impulses form thrust


In theory, its design is no more complicated than a traditional ramjet or liquid-propellant rocket engine. It includes a combustion chamber and nozzle assembly, as well as means for supplying fuel and oxidizer. In this case, special restrictions are imposed on the strength and durability of the structure associated with the peculiarities of the engine operation.


Experimental Long-EZ aircraft with IDD. Photo National Museum of USAF

During operation, the injectors supply fuel to the combustion chamber; the oxidizing agent is supplied from the atmosphere using an air intake device. After the formation of the mixture, ignition occurs. Due to the correct selection of fuel components and mixture proportions, the optimal ignition method and the configuration of the chamber, a shock wave is formed, moving in the direction of the engine nozzle. The current level of technology makes it possible to obtain wave speed up to 2,5-3 km / s with a corresponding increase in thrust.

IDD uses a pulsating principle of operation. This means that after detonation and the release of reactive gases, the combustion chamber is blown out, re-filled with a mixture - and a new "explosion" follows. To obtain a high and stable thrust, this cycle must be carried out at a high frequency, from tens to thousands of times per second.

Difficulties and advantages


The main advantage of the IDD is the theoretical possibility of obtaining improved characteristics that provide superiority over existing and prospective ramjet and rocket engines. So, with the same thrust, the impulse motor turns out to be more compact and lighter. Accordingly, a more powerful unit can be created in the same dimensions. In addition, such an engine is simpler in design, since it does not need a part of the instrumentation.

IDD is operational in a wide range of speeds, from zero (at the start of the rocket) to hypersonic. It can find application in rocket and space systems and in aviation - in civil and military fields. In all cases, its characteristic features make it possible to obtain certain advantages over traditional systems. Depending on the needs, it is possible to create a rocket IDD using an oxidizer from a tank, or an air-reactive one that takes oxygen from the atmosphere.

However, there are significant drawbacks and difficulties. So, in order to master a new direction, it is necessary to carry out various rather complex studies and experiments at the intersection of different sciences and disciplines. The specific operating principle makes special demands on the engine design and its materials. The price of high thrust is increased loads that can damage or destroy the engine structure.


IDD for Long-EZ. Photo National Museum of USAF

The challenge is to ensure a high rate of fuel and oxidant delivery, corresponding to the required detonation frequency, as well as to perform a purge before fuel delivery. In addition, a separate engineering problem is the launch of a shock wave at each cycle of operation.

It should be noted that to date, the IDD, despite all the efforts of scientists and designers, are not ready to go beyond laboratories and test sites. Designs and technologies require further development. Therefore, it is not yet necessary to talk about the introduction of new engines into practice.

History of technology


It is curious that the principle of a pulsed detonation engine was first proposed not by scientists, but by science fiction writers. For example, the submarine "Pioneer" from the novel by G. Adamov "The Mystery of Two Oceans" used IDD on a hydrogen-oxygen gas mixture. Similar ideas appeared in other works of art.

Scientific research on the topic of detonation engines began a little later, in the forties, and the pioneers of the direction were Soviet scientists. Later, in different countries, attempts were made to create an experienced IDD, but their success was seriously limited by the lack of the necessary technologies and materials.

On January 31, 2008, the DARPA agency of the US Department of Defense and the Air Force Laboratory began testing the first flying laboratory with an air-breathing type IDD. The original engine was installed on a modified Long-EZ aircraft from Scale Composites. The power plant included four tubular combustion chambers with liquid fuel supply and air intake from the atmosphere. At a detonation frequency of 80 Hz, a thrust of approx. 90 kgf, which was enough only for a light aircraft.

Pulse detonation engines as the future of missiles and aviation
Russian rotary detonation engine "Ifrit". Photo by NPO Energomash

These tests showed the fundamental suitability of the IDD for use in aviation, and also demonstrated the need to improve designs and increase their characteristics. In the same 2008, the prototype aircraft was sent to the museum, and DARPA and related organizations continued to work. It was reported about the possibility of using IDD in promising missile systems - but so far they have not been developed.

In our country, the subject of IDD was studied at the level of theory and practice. For example, in 2017, the Combustion and Explosion magazine published an article about tests of a detonation ramjet engine running on gaseous hydrogen. Also, work continues on rotary detonation engines. A liquid-propellant rocket motor, suitable for use on missiles, has been developed and tested. The issue of using such technologies in aircraft engines is being studied. In this case, the detonation combustion chamber is integrated into the turbojet engine.

Technology perspectives


Detonation engines are of great interest from the point of view of application in various fields and fields. Due to the expected increase in the main characteristics, they can, at least, squeeze out the systems of existing classes. However, the complexity of theoretical and practical development does not yet allow them to come to use in practice.

However, positive trends have been observed in recent years. Detonation engines in general, incl. impulse, increasingly appear in the news from laboratories. The development of this direction continues, and in the future it will be able to give the desired results, although the timing of the appearance of promising samples, their characteristics and areas of application are still questionable. However, reports of recent years allow us to look to the future with optimism.
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  1. Ros 56
    Ros 56 20 November 2020 06: 42
    +4
    Good luck to all developers. Aircraft modellers launched pulsating taxiway models about 60 years ago. Anyone who can find the book "Fly a Model" will find there detailed drawings of how to make such an engine himself, nothing complicated for those who have hands. It turns out, roughly speaking, a pipe about a meter long and 80-90 mm in diameter. The engine shouts with a bad voice, it gets red-hot, so many parts are made of titanium. They were forbidden to use them in competitions due to the high fire hazard, no one knows where the model will fly and whether the next field will be burned with the harvest.
    1. Aviator_
      Aviator_ 20 November 2020 09: 18
      10
      Do not confuse the PuVRD, which was installed on the V-1, with a detonation engine. These are two different things.
      1. Ros 56
        Ros 56 20 November 2020 13: 37
        0
        Well, what is the difference, injection of a portion of fuel, instant combustion, opening of a valve, another injection of fuel, and so on indefinitely as long as there is fuel. But as with management, there is no such thing.
        1. Aviator_
          Aviator_ 20 November 2020 14: 17
          +4
          The difference is in the combustion process. Detonation still needs to be organized. Again, the Germans had to make a valve grill on subsonic so that the combustion products would fly out into the nozzle, and not into the air intake. After the war, Chelomey at CIAM tried to bring this engine up for 5 years, but failed.
          1. Ros 56
            Ros 56 20 November 2020 14: 21
            0
            Petal valves are put, blow there, and from there cuckoo. Therefore, they are pulsating. But you are right, there is an unpaved field of work here.
            1. Aviator_
              Aviator_ 20 November 2020 14: 25
              +4
              Veterans of CIAM, whom I still met at the very beginning of the 80s, said that PUVRD at the stands of CIAM rumbled almost half of Moscow in the late 40s.
              1. Ros 56
                Ros 56 20 November 2020 14: 28
                0
                So, and I wrote about what at the very beginning, and it was very difficult to launch.
          2. niksfromru
            niksfromru 20 November 2020 15: 36
            +2
            The common feature of a pulsating PDE with a PUVRD is that both can work only in a fairly narrow frequency range, and, accordingly, the developed thrust. Which is not very great for aviation. By the way, "valveless" PUVRD also exist
        2. abc_alex
          abc_alex 20 November 2020 21: 35
          +3
          Quote: Ros 56
          Well, what is the difference, injection of a portion of fuel, instant combustion, opening of a valve, another injection of fuel, and so on indefinitely as long as there is fuel. But as with management, there is no such thing.

          For detonation, specific conditions are required. If you simply inject fuel into the combustion chamber and ignite it, it does not detonate, but burns. For detonation, the fuel must be undermined - to create a local pressure drop and not to raise the temperature.
          In addition, the speed of the detonation front is much higher, which means that the impact on the engine parts is more destructive.
          And the main thing. Detonation is a very short pulse. A high pulse frequency is needed to obtain uniform engine thrust. And the RD is still a heat engine, it heats up during operation with each pulse, and I remind you that we need to get not combustion, but an explosion.

          Feel the difference?
        3. venik
          venik 20 November 2020 21: 45
          +1
          Quote: Ros 56
          Well, what is the difference, injection of a portion of fuel, instant combustion, opening of a valve, another injection of fuel, and so on indefinitely as long as there is fuel.

          ===========
          And the difference, and - the PRINCIPAL difference - is in the processes! In PuVRD - combustion, and in IDD - detonation!
          Do you catch the DIFFERENCE?
          1. Ros 56
            Ros 56 21 November 2020 09: 22
            -1
            So I do not argue, but wrote purely for informational purposes, to the fact that these technologies have long been used.
            And the details are already secondary.
      2. venik
        venik 20 November 2020 21: 42
        +2
        Quote: Aviator_
        Do not confuse the PuVRD, which was installed on the V-1, with a detonation engine. These are two different things.

        =========
        By the way - it is still used today:
        Air target E-95 (with PuVRD: and "cheap and cheerful"):
        1. Aviator_
          Aviator_ 20 November 2020 21: 51
          0
          It seems Kazan production. I saw it at some MAKS.
          1. venik
            venik 21 November 2020 09: 40
            +1
            Quote: Aviator_
            E-95

            ========
            I do not know exactly. Targets E-95 Produced by the company "ENIX". Their legal address: Moscow, Kashirka, somewhere near the metro station "Domodedovskaya" ..... And where are the production facilities - request
            PS By the way, the company is not very young - it was formed during the Soviet era! It looks like they grew up from avmodelists, but they are engaged in quite serious things - UAVs!
      3. Fantazer911
        Fantazer911 22 November 2020 19: 36
        0
        This is like in a belt lamp, but only with the fact that there is portionwise and due to detonation, but detonation occurs at the moment of compression as in a piston, and here it is like a mixture of an igniter with air, like gas and air, 10% air and 15% gas , there is an explosion, by what principle, completely confused
    2. tovarich-andrey.62goncharov
      tovarich-andrey.62goncharov 20 November 2020 18: 13
      -1
      make many parts of titanium "- well, it's that simple! And the necessary titanium glands can be found at the nearest landfill ...
    3. Local from the Volga
      Local from the Volga 20 November 2020 22: 19
      +1

      well, everyone read!))
  2. KCA
    KCA 20 November 2020 06: 47
    +3
    Is the V-1 coming back?
    1. mat-vey
      mat-vey 20 November 2020 08: 12
      +2
      Machine mathematics B. Stechkin.
  3. Aag
    Aag 20 November 2020 07: 01
    +1
    "... such an engine is simpler in design, since it does not need a piece of instrumentation ..."
    In this part, "vague doubts are gnawing" ... But how to control the modes, thrust? What is meant by "part of the instrumentation"?
    1. Fantazer911
      Fantazer911 22 November 2020 19: 40
      +1
      Based on what I have read, I can conclude that there is no way to control the thrust, if only the computer is controlled and then everything is vague, the process is only controlled with a certain portion of the mixture, and the excess sees either the damping of combustion or bad boom
      1. Aag
        Aag 22 November 2020 19: 53
        0
        Quote: Fantazer911
        Based on what I have read, I can conclude that there is no way to control the thrust, if only the computer is controlled and then everything is vague, the process is only controlled with a certain portion of the mixture, and the excess sees either the damping of combustion or bad boom

        Sorry, I can assume that you are not special. in this area. I can also safely say that I too ...))
        But, flashing a computer for certain modes, sensor readings, IMHO, is not a big problem at the modern level ...
        Traction control, from an amateur's point of view, is seen only by the pulse frequency, which, in turn, imposes restrictions on maneuverability, trajectory correction ...
        Or, in your opinion: fuel-oxidizer, -dosing ... We lose all the advantages of the impulse, we return to the classics of Korolev ...
        1. Fantazer911
          Fantazer911 22 November 2020 22: 33
          +1
          I'm not a specialist, although I am technically educated, but in any case, if the imagination resists the circuit, then the control, even dosed it is not the same compote, suppose the supply of fuel and oxidizer impulses, dosed, we create the frequency of pops, detonation, a pushing moment appears, we increase frequency, we increase the thrust, but with an increase in pops, detonation, the nozzle zone itself heats up, the temperature rises, as a result of which the detonation will go into the combustion process, since the temperature surrounding the detonation chamber will reach a maximum and there will no longer be cotton but combustion, the transition from one state to another, how, even by adjusting the supply system with the control unit, the computer can avoid the transition from pops, detonation, to direct combustion? As much as I understand the article is exactly the whole point in this process!
  4. The leader of the Redskins
    The leader of the Redskins 20 November 2020 07: 15
    +1
    With a regular frequency, articles about the next developments of detonation engines appear on the pages of technical publications, and things are still there ...
    1. gridasov
      gridasov 20 November 2020 09: 33
      -4
      WHO will remain there and there will be no progress as the torn blanket is being pulled over. Each particular problem is solved by a particular solution. There is no comprehensive approach. The theoretical substantiation of a comprehensive solution to ensure obtaining a high energy density of the flow in the absence of the possibility of its stalling at any speed and any changes in the parameters of the medium was developed in

      privately and outside laboratories and institutes. Therefore, the question hangs in the air, namely, the desire to obtain tenology at a new level of analysis of large and complexly linked data. There is definitely no progress in this. On modern approaches, it is analysis that does not solve the problem.
      1. AVA77
        AVA77 20 November 2020 21: 00
        +1
        Well now everything has become clear and understandable laughing Thank you for explaining everything so clearly. hi
  5. gridasov
    gridasov 20 November 2020 10: 25
    -3
    An efficient engine cannot operate on dominants associated only with mass rejection. This means that the basis of the solution is the possibility of converting the kinetic energy of the flow in combination with the transformation of the potential energy of the flow. Moreover, in such a way that there is no stall at high and any speeds. And such a solution is proposed!
    1. A009
      A009 20 November 2020 13: 50
      +6
      I am extremely curious, when will you be banned for apocalyptic nonsense, and moreover, for heresy in relation to science and physics in particular?
      Well, by God, it's impossible to read you without tears (and sometimes bloody ones)
      1. gridasov
        gridasov 20 November 2020 15: 22
        -2
        I wonder what I said this without refuting the laws of the academic sciences or the health of thinking. I'm talking about more in-depth research, in particular mathematics and fundamental physics. In mathematics, one cannot lie and hide the obvious, and the function of a constant value of a number is the obviousness that opens up new possibilities for the analysis of high-potential processes. In physics, we are talking about the possibility of analyzing just magnetic fluxes, which can only be analyzed by a function of a constant value of a number and large data. In general, I conclude that the more unusual the more difficult, first of all, it is accepted
      2. KKND
        KKND 20 November 2020 19: 35
        -2
        Quote: A009
        I am extremely curious, when will you be banned for apocalyptic nonsense, and moreover, for heresy in relation to science and physics in particular?

        I'm afraid they won't be banned soon. This is most likely one of the site employees' avatars. The logic is simple - we write a message of this nature, several people are bought on it and write their comments in the sense of laughing at it. Usually everyone laughs, everyone is happy, they come to VO again to read it, laughing at Gridasov in the team. The resource traffic does not drop as everyone is happy. IMHO.
      3. abc_alex
        abc_alex 20 November 2020 22: 06
        0
        Quote: A009
        I am extremely curious, when will you be banned for apocalyptic nonsense, and moreover, for heresy in relation to science and physics in particular?
        Well, by God, it's impossible to read you without tears (and sometimes bloody ones)

        What's so absurd?
        The man said only that for the stable operation of the jet engine in all modes, it is necessary to additionally communicate energy to the working fluid. The "artillerymen" are talking about this, for example, offering to heat up the powder gases in the barrel with an electric arc. In my opinion, it is logical, no?
    2. astepanov
      astepanov 20 November 2020 14: 49
      +3
      Quote: gridasov
      An efficient engine cannot run on dominants

      How! And I, out of my dullness, thought that the engine runs on kerosene and air. And there it is, on the dominants. How far the thought has advanced! Filled a full tank of dominants - and fly, wherever you want!
      Gridasov, you wanted to say something, if you translate from a highly educated person to a human? Why do you have everything with a twist, but without meaning?
      1. gridasov
        gridasov 20 November 2020 15: 25
        0
        You can imagine what you want! Only logical and complete developments are not and are not expected.
        1. A009
          A009 20 November 2020 17: 25
          0
          Now, without any humor, I am not strong in psychiatry, fundamental physics is much closer to me, but I have met schizophrenics. Your dialogue is very similar to their nonsense. Each phrase is quite logical and consistent. But the essence is just sheer rubbish. To be honest, it's sad to read what you write. Because I'm afraid my fears are true.
          1. gridasov
            gridasov 20 November 2020 20: 41
            0
            You can imagine how much information we can create communication. Personally, I know because everything that I say is only theses and a very small part to draw conclusions like yours. I don't think it's that simple.
      2. gridasov
        gridasov 20 November 2020 21: 05
        -1
        The mathematical model of engine operation should be described
        One language for all participants in the process, including fuel. What is kerosene for you is what you represent in the framework of certain
        parameters. And for me it is part of the interaction space. But all this has one language of description - mathematical.
    3. tovarich-andrey.62goncharov
      tovarich-andrey.62goncharov 20 November 2020 18: 15
      -1
      Scientific nonsense!
      1. gridasov
        gridasov 20 November 2020 20: 54
        0
        what kind of science are you talking about if there is no model for building local

        unbreakable space on





        all levels of dimensions of what it represents. In other words, we are talking about the science of low-potential and high-potential physical processes. But then the analysis of these high-potential processes must be carried out by a different mathematical method, and not by computational ones and applicable for low-potential physical processes.


  6. Stalnov I.P.
    Stalnov I.P. 20 November 2020 10: 48
    +1
    The principle of operation and all the justifications for this engine were developed by academician and first assistant Kurchatov on the atomic project of the USSR ZELDOVICH, an outstanding scientist of the Soviet Union, back in the 40th year of the last century.
    1. gridasov
      gridasov 20 November 2020 11: 36
      -1
      I'm sorry, but everything is fundamentally not logical. The influence of the information space in which they then lived is felt
      1. astepanov
        astepanov 20 November 2020 14: 46
        +3
        There is a fundamental subtlety here that must be understood. No tricks can improve the energy efficiency of the engine, because it is determined by three things: the calorific value of the fuel, the chemical composition of combustion products and the characteristics of the combustion cycle (temperature and pressure at the inlet, temperature and pressure at the outlet). The thermodynamic cycle in a detonation engine is hardly more efficient than in any other. This means that we are only talking about increasing the power by burning more fuel per unit mass of the engine, or reducing the mass of the engine with the same fuel consumption.
        1. gridasov
          gridasov 20 November 2020 15: 27
          -1
          Correctly! Only for fuel, as a source of energy, you need to take air and its main component water. It should be understood that the parameters of water compression are determined by the compression density ma
          shells and we are faced with these phenomena at every step. We are simply blind in analyzing what we see and perceive on primitive binary logic

          1. A009
            A009 20 November 2020 17: 27
            -1
            This is of course kapets. !!!!
            What are you carrying!
          2. tovarich-andrey.62goncharov
            tovarich-andrey.62goncharov 20 November 2020 18: 17
            -1
            perceived on primitive binary logic
            - Well, apply the ternary ...
            1. gridasov
              gridasov 20 November 2020 20: 49
              -1
              I am applying multipolar logic on natural numbers x. Modern mankind uses binary logic, which is inherent in converting a code into an electromagnetic pulse. In this case, the code does not have any mathematical meaning. It is just one and zero or ON-OFF. Therefore, it is unlikely that anyone will understand the principle of direct conversion of the value of the nat number of a series used as a code.
              in the electro magnetic impulse. This means that the logic of my work is multipolar. Do you think that you just think and reason. Far from it! All your thinking is based on associative knowledge and it is very limited.
        2. niksfromru
          niksfromru 20 November 2020 15: 42
          0
          As for an internal combustion engine, efficiency largely depends on the compression ratio, and for a jet engine, on the exhaust speed. But, besides this, the specific parameters of the power plant are much more important for aviation. What is the use of an engine, even with 100% efficiency and near-light outflow velocity, if the thrust it develops is not enough to lift it into the air? ;)
          1. gridasov
            gridasov 20 November 2020 16: 57
            0
            You forgot to write about suction speed and thrust.
        3. Hypatius
          Hypatius 20 November 2020 16: 09
          +1
          This means that we are only talking about increasing the power by burning more fuel per unit mass of the engine, or reducing the mass of the engine with the same fuel consumption.
          I will give a simple analogy without numbers and buzzwords, because too lazy to google. Set it on fire or make it detonate. The energy output, with the same amount of TNT, will differ several times, if not orders of magnitude.
          1. gridasov
            gridasov 20 November 2020 17: 02
            -1
            Correctly ! Look at the process of not just impulse detonation, but also the algorithms, as well as the explosion must be concentrated in order to obtain a directed energy output. But in my opinion, the creators of engines do not think about not only these, but also other aspects.
            1. astepanov
              astepanov 20 November 2020 17: 41
              0
              Quote: gridasov
              Correctly !

              Gridasov, leave me alone. Your depths frighten me.
              1. Abram Ivanovich
                Abram Ivanovich 21 November 2020 18: 26
                0
                A directed explosion is an interesting idea! But here's how to do it ... You can't do anything with liquid fuel. Orion and Kasaba ... Oops.

                (puts on lead panties and an aluminum cap)
          2. astepanov
            astepanov 20 November 2020 17: 40
            +3
            Quote: Hypatius
            I will give a simple analogy without numbers and buzzwords, because too lazy to google. Set it on fire or make it detonate. The energy output, with the same amount of TNT, will differ several times, if not orders of magnitude.

            Let's put it out of order. When detonating the tol, less energy is released, although this will seem strange to you. The reason is that detonation produces, among other things, soot, and when burned, the soot turns into carbon dioxide, releasing heat. But the detonation power is immeasurably greater. You are confusing power and energy.
            As for the energy of the explosion and combustion of the tol, do not be lazy, google it. You will be pleasantly surprised.
            1. chenia
              chenia 20 November 2020 18: 11
              0
              Quote: astepanov
              You are confusing power and energy.
              As for the energy of the explosion and combustion of the tol, do not be lazy, google it. You will be pleasantly surprised.


              Wo, right. Hypatia wanted to fix it too, but you were ahead. For example, the work (chemical reaction) of 1 liter of gasoline will drag a car per ton by 10 km. And if you use RDX with detonation, then a product (clearly not an auto) in a ton of small detonations will go about the same distance (equal power). And if a huge burst of energy per unit of time is just a large explosion power.

              The detonation engine will probably be only with a slightly higher (by tens of percent) efficiency (less to warm the atmosphere), perhaps that's all. But the organization of this process, you can see that headache. They have been talking about this for a long time, experimenting. but not more.
  7. gridasov
    gridasov 20 November 2020 15: 44
    0
    In general, I want to say that on the basis of the principles of mathematical uncertainty and linear sequences of construction of mathematical data, it is impossible not only to describe the turbulent level of motion of a mobile medium and transient processes, and therefore it is impossible to understand how to ensure the continuity of the flow, how the outflow surface is ionized and many other phenomena and processes. I'm talking about the possibility of constructing an algorithmically connected mathematical space and not only in its transformation, but also
    the diversity of processes. And most of all, I already do not really strive to promote the discovery and the complex of knowledge. In general, I am afraid of society. Therefore, I am accustomed to the fact that everything happens as it is. So there is no reason for many to be nervous - I'm not going to drive a wave
    1. tovarich-andrey.62goncharov
      tovarich-andrey.62goncharov 20 November 2020 18: 21
      0
      I generally want to say -
      You would be better off with the General Field Theory, or something ... It would be immediately and always, and not what is here.
  8. eklmn
    eklmn 20 November 2020 17: 54
    0
    What do they have?
    March, 2020
    "Raytheon has contracted with DARPA to develop a long-range attack missile with an RDE (Rotating Detonation Engine) engine"
    https://defpost.com/raytheon-awarded-darpa-contract-rde-powered-long-range-strike-missile/
    “A rotary detonation engine (RDE) is a proposed engine that uses a form of pressure-intensifying combustion where one or more knocks are continuously moved through an annular channel.
    In detonation combustion, the results expand at supersonic speed. In theory, this is 25% more efficient than conventional deflagration combustion. This improvement in efficiency would provide significant fuel savings, but disadvantages include instability and noise. ”
  9. Falcon5555
    Falcon5555 21 November 2020 02: 16
    0
    However, reports of recent years allow us to look to the future with optimism.
    And I look to the future with optimism and without "messages from recent years." laughing I don't even care about the "messages of recent years". Even on the penultimate ... laughing
  10. Knell wardenheart
    Knell wardenheart 21 November 2020 02: 50
    +1
    A dubious topic, although in theory everything is beautiful and effective. In practice, this will be an even greater load on the engine materials, which is already enormous now. In case of success in the implementation of such a technology, the remote control may turn out to be incredibly capricious and expensive, and the advantages in speed and weight and dimensions are more than compensated for by excessive capriciousness and accident rate.
  11. Mikhail3
    Mikhail3 21 November 2020 14: 14
    0
    So far, there is no impression that such engines can be used anywhere other than short-range strike missiles. The main enemy of an engineer using any engine known to mankind in his system is vibration. Vibration destroys any components and devices, and the more powerful the engine per unit of its mass, the more destructive the vibration.
    Today, there are simply no materials that can survive in an engine that uses vibration as part of the power generation process and has an aviation or rocket mass / energy ratio. Simply put, for an engine to last longer than a few seconds, it must be very, very heavy. Yes, now is not the forties of the last century. But alas, it doesn't matter ...
    We still do not know about the matter absolutely nothing. We cannot, and using the existing theory, we will never be able to change the properties of matter. Therefore, such engines will forever remain laboratory samples. Alas.
  12. Abram Ivanovich
    Abram Ivanovich 21 November 2020 18: 37
    0
    Quote: Mikhail3

    We still know absolutely nothing about the substance. We cannot, and using the existing theory, we will never be able to change the properties of matter.


    In the sense of "not known"? I see that the properties of substances are well known to you. Or is it a hit on materialism?
    And about changing properties - there is such a thing: metamaterials. There, the properties do not depend on the composition, but on the structure, in short. I don't want to change. Here's food for your mind!
    1. gridasov
      gridasov 22 November 2020 10: 40
      0
      We can change the properties of a substance through the methods of structural transformations of precisely nuclear interactions. And it's very easy to do
      1. Mikhail3
        Mikhail3 23 November 2020 09: 33
        0
        Quote: gridasov
        We can change the properties of a substance through the methods of structural transformations of precisely nuclear interactions. And it's very easy to do

        Wonderful. I've been waiting for this for a long time! Please present ten kilograms of atomically rebuilt titanium to create a ramjet working chamber. So that this titanium withstands at least 10 million degrees and has sufficient strength for the working pressures of the chamber. Since everything is done simply, I'm waiting for tomorrow.
        Well, as you quit chatting nonsense, it is worth considering - two dozen atoms that are "visible" as a result of "correct experience" are nonsense. That's all.
        1. gridasov
          gridasov 23 November 2020 17: 13
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          You are thinking wrong. Named a material with parameters in the Earth's atmosphere, and immediately talk about parameters that are far from our Planet. Therefore, for the sounded parameters it will no longer be titanium, but a different material. I think it makes no sense to explain to you. In addition, one must be far from technically uninformed to understand that such temperatures and pressures do not need to be created. Engines based on the principles I am talking about and with lower parameters will work orders of magnitude more efficiently.
          1. Mikhail3
            Mikhail3 24 November 2020 09: 41
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            What "Planet"? Explain what? You stated that you can easily get structurally transformed materials. So you get it, instead of empty chatter. You can! But you have nothing but getting everything in the world with the help of a flexible tongue without bones. Like ours, earthly, not from a certain Planet, physicists. Whoever just talks is just yap.
            And those who also receive money for the gallows chatter are scammers and swindlers. This is me about our modern physicists, yeah. And yes, "explaining", that is, trying to powder my brains, is useless. Such a nuisance))
            1. Storog dvornik
              Storog dvornik 27 November 2020 09: 48
              0
              You and others argue in vain, this is a bot in the most literal sense - a program, pseudo-AI ... It is periodically launched by people to trick people with pseudo-scientific texts ...
              1. Mikhail3
                Mikhail3 27 November 2020 12: 57
                0
                So what? He gives an opportunity to speak)
        2. gridasov
          gridasov 24 November 2020 10: 54
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          In the first place, it is not my task to convince or persuade. I'm just giving my opinion. Despite the fact that no one condemns you, and not the opposite. I am in my place, you are in my place. My capabilities allow me to build deep theoretical foundations and talk about fundamentally new, primarily processes. And then, first of all, I work with new methods for distributing large data based on the function of constant value of a number, which in turn allows us to avoid any uncertainties and build an analysis architecture with absolutely accurate parameters and data. You generally understand what a fractal radial and algorithmically connected non-breaking space is. But it is around and within you. Think and dare!
          1. Mikhail3
            Mikhail3 24 November 2020 11: 01
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            Then you are trying to explain, bitterly coming to the conclusion that it is useless to explain to me. Then suddenly it turns out that you are not trying. And you are simply expressing an unsubstantiated opinion on a completely practical issue. "And I say that the walls of the detonation chamber are made of marzipan cake. And, mind you, I don't have to substantiate anything at all! My chatter has an independent value, since it is MY OPINION." Ugh...
            Then you start chasing some kind of blizzard about how cool you are on some other issue. In the topic under discussion, I, and everyone, somehow absolutely do not care about the fact that you are engaged in killing sindrulek. Syndrulki are not relevant to the issue under discussion. And my lack of tripulence in sepulenie sepulek has nothing to do with it, suddenly)).
            Have some cold tea. Cool your overheated head ...
            1. gridasov
              gridasov 24 November 2020 12: 08
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              Closer to the subject! Everyone understands that the creation of new materials involves the creation of structural changes using strong magnetic processes that affect structural transformation. However, one must understand that the intrinsic magnetic processes in the material and those artificially submitted are very different in quality. Therefore, in order to harmonize this process and it is necessary to use natural ionization in the environment of various substances of a different aggregate state. And this is a very simple technology.
              1. gridasov
                gridasov 24 November 2020 12: 48
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                By the way I will add myself. I'm not just talking about metals and conductive materials. How, for example, can you create a current in the so-called strong electricians? In other words, how to destroy the whole theory in the bud
                Electrical conductivity of materials. Behind this there is a concept that is fundamentally new on the principle of the organization of physical processes in nuclear reactors. And here it doesn't matter at all fast electrons or what others. It doesn't matter whether the material is enriched or not. It all depends on one single condition.
    2. Mikhail3
      Mikhail3 23 November 2020 09: 24
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      Arrivals - this is to the bandits, please. Metamaterials are mixtures. We have learned to quite deftly stir in a bucket with a spatula and fill the steel frames with ceramic slurry. Fantastic achievement! Indicates the deepest penetration of human genius into the depths of matter. Tears from the eyes, snot from the nose ...
      To equate the obviously untenable theory of the composition of atoms, nuclei, etc. to materialism, it is very perspicacious. Reminds me of an objection to a new hypothesis in physics - yes, you are against Marxism-Leninism! Or the biologists: Weismanist-Morganist-Anti-Pauline! Alas and ah ...
      Physics can trample ideological cries. But physics cannot be fooled! You can build as many cyclotrons and other monstrously expensive toys as you like, puff out your cheeks and it is important to tell that "the Higgs boson has confirmed the correctness of the classical model." The facts are as follows - the classical model collapsed long ago and does not correspond to the data of experiments at all. Since we are not able to change matter, it means that we do not understand how it works. That's all.
      Judging by the fact that modern physics with an important and mysterious look is marking time in a dead end, from time to time reporting about "epoch-making discoveries" which, as usual, can neither be demonstrated nor even somehow applied, in general, the whole theory of matter is entirely completely wrong. This always happens with incorrect theories, built without sufficient data, and turned out to be applicable in a small fraction of cases. It's time to discard the obvious nonsense, and everything will be done again.
      However, it is possible to build monstrously expensive structures, rake out grants and receive fat salaries! Without doing anything! It's even much more profitable! You don't even need to be a physicist to be an adherent of the wrong theory! You just need to learn a couple of hundred difficult words and get closer to the powerful financial flows. Sharing with officials, you can imitate "scientific work" for many decades without doing anything or knowing. This is exactly what happens in modern physics.
      Such is materialism, panima ...
      1. gridasov
        gridasov 24 November 2020 11: 35
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        Wonderfully written! It is incredibly difficult to really promote new things in physics and mathematics. Especially in big data analysis theory. Therefore, when I talk about the constant value function of a number
        , I understand what it means to perceive not associative concepts, and even more so an array of complex processes
  13. alien308
    alien308 21 November 2020 23: 52
    +2
    As far as I understand lies, everything is written for the reasons of the use of detonation combustion modes. At high supersonic speeds, thermal death of the engine occurs. Deceleration of the flow to a subsonic speed in front of the combustion chamber heats up the air and the heating of the flow due to combustion becomes so insignificant that the efficiency becomes negative. The obvious solution is not to slow down until subsonic. Suddenly deflagration is too slow. The fuel does not have time to burn. Therefore, they want to switch to detonation modes. On subsonic noise, detonation combustion is pampering. Only niche applications like the engine is just a pipe.
    1. Alisher
      Alisher 22 November 2020 01: 14
      +1
      Agree with several previous comments, this is a very special niche solution. You need special fuel, with additives that provide the required detonation speed. The shock wave also presses on the walls - which means they need more durable and heavier ones, which means they are applicable only to large engines, or to stationary engines. And vibration is a problem for any technique and for pilots.
      In fact, this is a method of increasing the pressure of the outflowing gases, and, accordingly, their speed. But the amount of chemical energy in the fuel remains, as long as the power has increased, the fuel consumption will also increase.
      Perhaps it is possible to improve the efficiency or economy if, as in a turbofan engine, the bypass ratio is increased, i.e. to force the shock wave to push out not only the combustion products, but also the additionally mixed compressed incoming air, to increase the ejected mass.
      1. gridasov
        gridasov 22 November 2020 10: 35
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        I will only note that the shock wave is output to that part of the device in which its impulse is directed towards the movement of the rotor. Moreover, the radial vectors of the explosive impulse form the rotation of the energy carrier flow
      2. Mikhail3
        Mikhail3 23 November 2020 09: 41
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        Quote: Alisher
        But the amount of chemical energy in the fuel remains, as long as the power has increased, the fuel consumption will also increase.

        Right. But the method of extracting it in conventional taxiways is not the most efficient one. The proposed method allows you to extract more energy from conventional fuel and use more energy-intensive fuel, which is quite possible to create. That's just ... see above.
    2. gridasov
      gridasov 22 November 2020 10: 38
      +1
      Therefore, there is a talk about the possibility of using such techniques that, as algorithms for successive stages of the process, use only positive extremes of each stage.
  14. Alisher
    Alisher 22 November 2020 01: 36
    +1
    Perhaps what Gridasov writes about "the outflow surface is ionized" is applicable, but to ion engines. First, the detonation engine must create a plasma using high pressure and speed, and then it must be further accelerated by a magnetic / electric field.
    After all, the high temperature of the outgoing gases is associated losses, the reactive force is the mass per speed, the temperature is not included in the formula.
    1. gridasov
      gridasov 22 November 2020 10: 31
      0
      Ionization of the surface of the outflow of air passing through the turbine must be used in order for the blades of the rotating rotor, namely the rotating one, to create a magnetic moment of rotation around the blade. then the flow rate increases dramatically. But, it should be borne in mind that it becomes possible to use the potential energy of air as a substance with certain parameters and physical properties. Algorithms of the new process correspond to both ionic and detonation and turbines for all environments and in general changes everything to a completely new level and possibilities.
      1. Alexander Grizodub
        Alexander Grizodub 28 November 2020 04: 51
        0
        I still don't understand, is this your trolling, or do you really think so?
        1. gridasov
          gridasov 28 November 2020 18: 03
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          Not only think, but I will note that they are justified.