引射器形式对脉冲爆震发动机性能的影响分析

为了研究引射器结构形式对脉冲爆震发动机性能的影响,以氢气和氧气混合物为例,采用数值计算方法,对加装收敛、扩张和收扩型三种引射器的脉冲爆震发动机进行了数值模拟,并对其性能进行了比较与分析.计算结果表明,只有收扩型引射器能起到增推作用.同时,将二次流率与增推比相比较,发现二者成正比关系.研究结果对脉冲爆震发动机设计中引射器的选型具有一定的参考意义.

Analyse of ejector forms influence on pulse detonation engine performance

To research thrust augmentation of ejector forms driven by pulse detonation engine, numerical calculation method was used to simulate pulse detonation engine with converging, diverging and converging-diverging ejector. The simulation was carried out in hydrogen-oxygen mixture. The results indicated that ejector systems can utilize the energy stored in the strong shock wave exiting the detonation tube to augment the impulse obtained from the detonation tube alone. And the increase of mass flow rate of secondary stream can lead to the increase of impulse augmentation ratio. Impulse augmentation ratios of converging-diverging ejector of 1.68 were achieved.