引射器位置对脉冲爆震发动机性能影响

以氢气和氧气混合物为例,通过对加装收敛扩张型引射器,采用数值计算方法对脉冲爆震发动机性能进行模拟,获得了爆震管出口相对引射器喉部处于上游、中间和下游三种引射器位置对脉冲爆震发动机性能的影响规律.计算结果表明,爆震管出口相对引射器喉部处于下游时的增推效果最好,处于中间时次之,上游时效果最差.将二次流率与增推比进行比较,发现引射器的冲量增推比随引射的二次流率增加而增大.

Influence of Ejector Location on Pulse Detonation Engine Performance

To investigate the influence of ejector location on pulse detonation engine performance, pulse detonation engine with converging-diverging ejector was numerically simulated by hydrogen-oxygen mixture. The rule of the influence of different ejector location on PDE performance was obtained. Relative to ejector throat, the exit of detonation tube was located respectively at upstream, middle and downstream. The best performance can be observed when the exit of detonation tube was located at downstream of ejector throat. It is concluded that increased mass flow rate of secondary stream can further increase impulse augmentation ratio.