爆震波点火器管路传播过程数值模拟

Numerical simulation of detonation propagation in tube of detonation wave igniter

关键词:  液体推进剂火箭发动机  爆震波  点火器  数值仿真

Key words:  Liquid propellant rocket engine  Detonation wave  Igniter  Numerical simulation

摘要:

为了进一步研究液体火箭发动机爆震波点火器的工作过程,结合实际试验发动机用爆震波点火器的工作条件,在混合比为3,初始氢氧混气压力为0.1MPa情况下,采用常用的两步显式M acCorm ak差分格式和有限速率化学反应动力模型,对爆震波点火器管路中爆震波的传播过程进行了数值模拟,研究了爆震波形成后在一维管路中传播特性及性能参数。从数值模拟结果来看,稳定传播的爆震波温度可达3500K,压力达到2MPa,其传播速度可达3430m/s,从爆震波形成到其传播到2m距离的出口,用时不到0.6m s。并与试验结果进行了对比分析,数值模拟结果和试验结果符合很好,为爆震波点火器的工程设计提供了理论依据。

Abstract:

To investigate the process of detonation wave igniter of liquid rocket engine,one-dimensional reacting flow and finite reaction velocity model were used and the two-step explicit MacCormak scheme is adopted to numerically simulate the detonation wave propagation in the tube of the detonation wave igniter,with the factual experimental engine condition in which H₂/O₂ mixture ratio is about 3 and the initial pressure is 0.1MPa.The characteristics of detonation wave in a one-dimension tube with detonation wave formed were studied.The numerical results show that,the stable detonation wave has a high temperature of 3500K and high pressure of 2 MPa,and its propagation velocity is about 3430m/s.It costs less than 0.6ms when the detonation wave arrives at the exit of a 2m-long tube. The numerical results agree well with experimental data and provide theoretical basis for engineering design of detonation wave igniter.