Study On The Reverse Pressure Conduction Characteristics Of The Rotating Detonation Wave

Detonation has the advantages of fast burning and high thermal efficiency,and it can increase the total pressure.It can reduce the number of compressor stages in traditional turbine engine,make engine length shorter and structure simpler.And because it can work stably in the lean oil condition,can reduce the emission of pollutants.However,there are still some technical problems in the application of the rotating detonation chamber to the turbine engine.The detonation waves in the rotating detonation chamber will produce oblique shock waves upstream.If the upstream is directly connected with the compressor,it will inevitably affect the stability of the compressor.Therefore,the study of the reverse pressure conduction characteristics of the rotating detonating wave is of important to the application of the rotating detonation chamber.Firstly,the reverse pressure conduction of a rotating detonating wave is studied with a slit tube.It is found that the pressure fluctuation at the upstream of the rotating detonation wave is not simply caused by the oblique shock wave caused by the lateral expansion of the detonation wave.The expansion of the high pressure area after the detonation wave and the reflected shock wave will cause the pressure oscillation in the annular gap.The reflection and intersecting of the shock wave in the annular gap will cause the pressure peak to be further improved on the basis of the pressure after the first oblique shock wave.The area of high pressure in the inner seams of the inner seams is larger.For different radius and width slotted bends,it is found that increasing the radius of the rotary detonation combustor and reducing the width of the channel will reduce the angle between the detonation wave and the reflected shock wave and the inner and outer walls,so as to reduce the intensity of the reflected shock wave and reduce the maximum pressure peak in the upstream annulus.Secondly,the wave elimination mechanism and wave elimination effect of the slit plate are studied.It is found that the larger the slotting angle is,the more obvious the expansion effect of the shock wave is in the joint.The fan shaped shock wave which constitutes the transmission shock wave is also larger by the expansion of the outlet of the joint,and the intensity of the transmission shock wave is smaller.Even in the case of regular reflection,the 150 degree slotted plate can also reduce the intensity of the transmission shock by 35%.After the increase of the intensity of the incident shock wave,the range of the high Maher number expansion zone after the plate increases,the intensity of the transmission shock decreases,and the effect of the wave elimination is stronger.The geometrical configuration of the slotted plate used to study the effects of wave dissipation effect,reduce the increase of plate thickness and porosity can help reduce the transmission of shock strength,but compared with the transmitted shock intensity variation change slotted angle caused by the calculation of small bowel transmission wave intensity change condition in this paper.Finally,the design criteria of the parameters of the rotating detonation chamber are summarized.The concept of flow coefficient is introduced,and the flow coefficient of oxidant and fuel is calculated based on the existing experimental results.Finally,the formula of jet area ratio is obtained based on the empirical pressure ratio and discharge coefficient of oxidant and fuel gas chamber.In order to measure the concrete strength of the oblique shock wave upstream of the rotating detonating wave,a new measurement scheme is designed.The rotating detonation experiment system is designed in detail,including the gas supply system,the flow control system,the ignition system,the data measurement and acquisition system.