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对吸气式脉冲爆震发动机(APDE)的反传进行了数值研究,分析了反传的形成及传播特性,得到了爆震室长度对反传的影响。结果表明:反压能够影响整个进气道,缩短爆震室长度有利于降低反压强度。要使反压强度大幅下降,爆震室长度需要大幅缩短。爆震室长度较长时,增长爆震室长度对反压强度影响不大,但会延长进气道的泄压时间。反压会造成进气道内流动反向,反流速度随着爆震室长度增长而增大,爆震室较短时这个趋势更加明显。反传燃气的影响区域明显小于反传压力,当爆震室长度缩短到一定程度时,燃气不会传入进气道。爆震室长度较长时,爆震室上游与进气道下游之间的流道内会出现燃气分布不连续的现象。
The back propagation of the aspirated pulse detonation engine (APDE) was numerically studied, and the formation and propagation of back propagation were analyzed. The effect of detonation chamber length on back propagation was obtained. The results show that: the back pressure can affect the entire inlet, shortening the length of the detonation chamber is conducive to reducing the compressive strength. In order to significantly reduce the back pressure, detonation chamber length needs to be significantly shortened. When the detonation chamber length is longer, the length of detonation chamber has little effect on the anti-compression strength, but it will prolong the relief time of the inlet port. The backpressure will cause the flow in the inlet to be reversed, and the velocity of back flow increases with the length of the detonation chamber. This trend is more obvious when the detonation chamber is shorter. The area affected by the anti-passing gas is obviously smaller than the back pressure, and when the length of the detonation chamber is shortened to a certain extent, the gas will not pass into the air intake. When the detonation chamber length is longer, the gas distribution may appear discontinuous in the flow passage between the upstream of the detonation chamber and the downstream of the intake passage.