连续旋转爆轰波传播过程试验研究

Experimental investigation on the propagation process of continuous rotating detonation wave

为研究连续旋转爆轰波的传播过程,采用充填H2/O2混气的切向预爆轰管起爆,开展了H2/Air连续旋转爆轰发动机试验研究。在当量比为0.76的工况下,试验成功起爆并实现了旋转爆轰波的自持传播,获得的连续旋转爆轰波传播主频为5211.25 Hz,传播波速为1439.97 m/s。分析了连续旋转爆轰波的起爆、传播和熄爆过程,发现在连续旋转爆轰波的起爆过程中,预爆轰管产生的初始爆轰波进入连续旋转爆轰发动机后,并未直接转变为连续旋转爆轰波,而是经历了一个爆燃转爆轰的过程。在此过程中,激波压力峰值的分布由疏到密,激波强度不断增大,说明连续旋转爆轰发动机内压缩波系逐渐汇合增强,形成前导激波,不断诱导引爆可燃混气,最终形成爆轰波。在旋转爆轰波的熄爆过程中,切断燃料供给之后,爆轰波并没有立即解耦,而是在旋转数周之后,才完全解耦为爆轰产物。

To study the propagation process of Continuous Rotating Detonation Wave(CRDW),an experimental investigation on a H2/Air Continuous Rotating Detonation Engine(CRDE) initiated by a tangential pre-detonation tube filled with H2/O2 was conducted. At an equivalent ratio of 0.76,the continuous rotating detonation engine has been successfully initiated and realized the self-sustaining propagation of the CRDW with a main frequency of 5211.25 Hz. The velocity calculated by the main frequency was1439.97 m/s. The initiation,propagation and quenching processes of the CRDW have been analyzed. During the initiation of the CRDW,the detonation wave generated by the pre-detonation tube underwent a process of deflagration to detonation transition instead of direct transformation into the CRDW after it entering to the CRDE. In this process,the peak pressure distribution of the shock waves was transformed from sparse to dense and the shock intensity increased continuously. It illustrates that the compression wave system in CRDE is gradually converged and strengthened. A leading shock has been appeared,which induces and ignites the combustible gas mixture,so that the CRDE was formed finally. When the fuel supply was cut off,the CRDW did not decouple immediately but continued to propagate for several cycles and then decoupled to detonation products completely.