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采用小能量点火方法,对吸气式脉冲爆震发动机的反传现象进行了数值研究。获得了反传现象的形成及传播特性。结果表明,吸气式脉冲爆震发动机的反传可以分为压力反传和燃气反传两部分。两者都是由缓燃和回传爆震引起的,回传爆震占主导作用。反传燃气的影响区域小于反传压力,由于尾部膨胀波的作用,反传燃气在一定位置会停止向上游进气道流动。反传压力会一直向进气道上游传播,并且迫使流道内的流体也向上游流动。等截面流道内反传压力减小的速度较慢,应对进气道进行优化设计。
The small-energy ignition method is used to study the anti-transmission phenomenon of aspirated pulse detonation engine. Obtained the formation and spread of anti-transmission phenomenon. The results show that aspirated pulse detonation engine can be divided into anti-counterpulse and anti-pass gas two parts. Both are caused by burn-in and return knocking, and return knocking dominates. The area affected by the anti-passing gas is smaller than the anti-transmitting pressure. Due to the effect of the tail expanding wave, the anti-passing gas stops flowing to the upstream inlet port at a certain position. The back pressure will always propagate upstream of the inlet and force the fluid in the flow to also flow upstream. Reverse cross-flow channel pressure reduction is slower, should be optimized for the intake port design.