脉冲爆震发动机多循环工作过程仿真及性能分析

Numerical simulation and performance analysis of multi-cycle pulsed detonation rocket engine

针对脉冲爆震发动机零维性能模型的局限性,建立了火箭式脉冲爆震发动机(PDRE)多循环工作过程的一维非稳态仿真性能模型,仿真模型能够捕获PDRE的非定常的工作特征,可研究各种调节参数对PDRE性能的影响,通过模拟计算直管PDRE和带收敛扩张喷管PDRE在多循环工作过程中的压力分布及其性能参数,可以看到,由于循环过程之间的耦合性,使得多循环脉冲爆震发动机(PDE)的内部流场与单循环PDE有很大的不同;同时,同样进气条件下,PDRE要比常规火箭发动机有优势,对其工作频率和隔离气体使用量是有要求的。

One-dimensional unsteady performance analysis model for simulating work process of multi-cycle pulsed detonation rocket engine（PDRE） was established.It can be used to obtain the unsteady characteristic of PDRE and to study the influence of regulate parameters on the performance of PDRE.Through the simulations of PDRE with and without convergent-divergent nozzle, it can be seen that great difference exists between multi-cycle pulse detonation engine（PDE） and single-cycle PDE because of the coupling of each cycles.And,work frequency and purge gas quantity of PDRE must be carefully chosen if the propulsive performance of PDRE needs to be better than conventional rocket.