脉冲爆震发动机孔板型气动阀工作特性实验研究

采用流动显示和压力测量两种手段对应用于脉冲爆震发动机的三种不同阻塞比孔板型气动阀进行了试验研究。研究结果表明，在不存在燃烧的流场里，孔板型气动阀具有较强的阻隔压力波动的能力；然而对于采用自适应供油的脉冲爆震发动机，发动机点火后，由于压差，燃油液雾必然向上游流动，孔板型气动阀将处于可燃混合物中，较强的燃烧火焰穿越孔板时，孔板将担当起射流点火的作用，从而加速火焰的传播，最终破坏孔板阻隔压力回传的作用；增大孔板阻塞比可以减少燃油液雾的反流量，这有助于爆震室对进气系统的影响。

Experimental investigation on characteristics of porus aerodynamic valve for pulse detonation engines

Three kinds of porus aerodynamic valve, which applied for pulse detonation engine, were researched by the methods of flow visualization and pressure measuring. It was shown that porus plate can be used for obstructing strong pressure wave in the fluid without combustion. However, for the pulse detonation engine with adaptive fuel supply, when ignition occurs, fuel spray will flow upstream for the reason of differential pressure and combustible mixture will flow through porous plate. If flame also transports through orifice, the jet ignition function of porous plate will be activated. Flame velocity accelerates and function of pressure attenuation is destroyed. The backflow flux of fuel spray can be decreased by increasing the block ratio of porous plate and it is useful to weaken the influence of detonation chamber on air intake.