分叉管内爆轰波传播特性实验研究

Experimental Study on Propagation Characteristics of Detonation Wave in Bifurcated Pipe

为了研究爆轰波在分叉管内的传播特性,对以H_2/O_2为燃料的分叉式脉冲爆轰发动机进行了实验研究。分别测试了不同工况条件下管内不同采样点爆轰波压力,并对其变化过程进行了深入分析。实验结果表明:爆轰波在分叉管内传播过程中,分叉口下游主管道内爆轰波在经过6倍管径长度的过渡区后恢复稳定,爆轰强度不变。爆轰波绕射进入分叉支管2,并且在管壁发生多次碰撞和反射,形成过驱爆轰,在燃料充分填充的条件下可以恢复稳定爆轰,爆轰强度与主管道内爆轰波强度相同。在分叉支管2内加装扰流片对加快形成爆轰的影响甚小,分叉支管2内燃料填充率是形成稳定爆轰的关键。

To study the propagation characteristics of detonation wave in bifurcated pipe, the experi-mental study which using the mixture of hydrogen and oxygen as fuel is carried out on a bifurcated pulse detonation engine. The pressure of detonation waves at different sampling points under different conditions is tested, and the change process is analyzed. The experimental results show that the detonation wave in the downstream main pipe of the branch becomes stable after the transition zone with the diameter of 6 times and the detonation intensity is unchanged when the detonation wave propagates in the bifurcation pipe. The overdrive detonation is formed due to detonation wave collides and reflects on the pipe wall when it diffracts into the bifurcated pipe 2. Stable detonation can be recovered under fully filled fuel condi-tion, and the detonation intensity is the same as the detonation strength in the main pipe. It has little effect on accelerating the formation of detonation with installing spoiler in the bifurcated pipe 2, and the fuel filling rate into the branch pipe is the key to the formation of stable detonation.