带扩张喷管脉冲爆轰发动机一维两相流场的计算

Calculation and Analysis on One-Dimensional Two-Phase Flow Field of Pulse Detonation Engine with Diverging Nozzle

应用CE/SE方法对带锥形扩张喷管的气液两相脉冲爆轰发动机的爆轰波在管内传播过程和排气过程进行了数值计算。分析了锥形扩张喷管对两相脉冲爆轰发动机内流场和性能的影响。数值模拟结果表明:爆轰波在锥形扩张喷管中压力峰值比在爆轰管中小;锥形扩张喷管内气流在排气的大部分时间保持超音速;锥形扩张喷管加速了发动机的排气过程,为提高发动机频率提供条件;脉冲爆轰发动机带锥形扩张喷管时的冲量比带直喷管和不带喷管时大。研究成果对脉冲爆轰发动机喷管设计具有重要理论指导作用。

A numerical simulation of detonation wave propagating through a diverging nozzle and the in- ternal flow field in the exhaust process in a gas-droplets two-phase pulse detonation engine （PDE） were carried out by means of CE/SE method to investigate the effect of diverging nozzle on pulse detonation en- gine. The numerical simulation results showed that the detonation pressure peak in the nozzle was found to be lower than that of in chamber. The airflow in tapered diverging nozzle was supersonic in the most time of blowdown process. Tapered diverging nozzle accelerates the exhaust process, and makes it possible to increase the engine operating frequency. The impulse of pulse detonation engine is higher in the case of diverging nozzle, when compared to the performance metric of a straight nozzle or non-nozzle PDE. All of the simulation results here can provide some theory guidance for nozzle design of PDE.