进气温度和当量比对脉冲爆轰发动机工作过程影响

Effect of inlet temperature and equivalence ratio on working process of pulse detonation engine

为了研究进气温度和当量比对脉冲爆轰发动机工作过程的影响,建立了带简单化学反应的气液两相爆轰欧拉-拉格朗日模型,使用二维时空守恒元与求解元(CE/SE)方法和变步长4阶龙格-库塔法分别求解气液两相爆轰方程.计算结果表明:提高进气温度,能加速液滴雾化、蒸发,缩短燃烧转爆轰距离和时间,但是会降低爆轰波的峰值压力;当量比小于1.1时,增加当量比,能缩短燃烧转爆轰距离和时间,提高爆轰波的峰值压力,加快爆轰波传播速度;当量比大于等于1.1时,增加当量比,能小幅提高爆轰波速传播度和缩短燃烧转爆轰距离和时间,但对爆轰波的峰值压力影响很小.

To investigate the effect of inlet temperature and equivalence ratio on the working process of pulse detonation engine,the Euler-Lagrange model considering chemical reaction mechanism for gas-droplets two-phase detonation was built,while the gas-droplets two-phase detonation equations were calculated respectively by the two-dimensional spacetime conservation element and solution element（CE/SE）method and variable-step fourthorder Runge-Kutta method.Numerical results show that increasing the inlet temperature can accelerate the droplets atomization and evaporation,shorten the deflagration to detonation transition distance and time,and reduce the peak pressure of detonation wave;when equivalence ratio is less than 1.1,increasing the equivalence ratio can shorten the deflagration to detonation transition distance and time and also increase the peak pressure and speed of detonation wave;when equivalence ratio is greater than or equal to 1.1,increasing the equivalence ratio can slightly shorten the deflagration to detonation transition distance and time and also increase the speed of detonation wave,but has a very small effect on the peak pressure of detonation wave.