脉冲爆轰发动机两点点火实验研究

Experimental study of ignition in pulse detonation engine by two ignition sources

为研究两点点火对脉冲爆轰发动机内爆轰波起爆及传播的影响,开展了脉冲爆轰发动机两点点火实验研究。实验结果表明,两点点火能有效促进脉冲爆轰发动机内爆轰的形成,能大幅提高爆轰波的峰值压力及爆轰波传播的速度。当两点点火源距离为260 mm时,两点点火时间间隔必须大于0.47 ms,爆轰发动机内才能形成促进爆轰发生的有利条件;适当增大两点点火的时间间隔能缩短缓燃转爆轰的距离,缓燃转爆轰的距离从590 mm缩短至420 mm。

To investigate the effects of two ignition sources in pulse detonation engine on the propagation of detonation wave, the ignition and propagation of detonation waves in pulse detonation engine were studied experimentally.The experimental results show that two ignition sources in pulse detonation engine can induce the formation of detonation wave.When the distance between the two ignition sources was 260 mm, the ignition time interval between the two ignition sources must be larger than a critical value （0.47 ms）, the detonation wave can be formed in the pulse detonation engine.The distance of deflagration to detonation transition （DDT） can be shortened by increasing the time interval between the two ignition sources, the DDT run-up distance was shortened from 590 mm to 420 mm.