基于火焰面模型的推力室起动过程仿真

Numerical Simulation on Start-up Process in Thrust Chamber Based on Flamelet Model

关键词:  火箭发动机  起动过程  火焰面模型  数值仿真 

Key words:  Rocket engine  Start-up process  Flamelet model  Numerical simulation

摘要:

采用计算流体力学的方法,对氢氧火箭发动机推力室的起动过程进行了数值仿真。起动的非定常过程由双时间步方法模拟,燃烧过程由稳态层流火焰面模型模拟,火焰面建库采用6组分8步反应的化学动力学模型。按照地面试车时序进行推力室起动过程仿真,获得了起动过程的建压曲线以及详细的流场建立过程。结果表明,经过点火瞬间压力松弛控制的稳态层流火焰面模型可用于火箭发动机的点火过程动态仿真,仿真得到的压力曲线与试车曲线相比符合良好。 

Abstract:

Numerical simulation on start-up process in thrust chamber of hydrogen-oxygen rocket engine was performed by computational fluid dynamics method. Dual-time-step method and steady laminar flamelet model were utilized to simulate the unsteady process and combustion process, respectively. The database of flamelet model was set up by 8steps with 6specices chemical reaction model. The pressure curve and the detailed parameters of flowfield were achieved from the simulation, which was performed according to the time sequence of start-up process. It turns out that, the steady laminar flamelet model is available to the start-up process and the pressure curve shows good consistency with the test curve. 