旋转爆轰发动机工作过程的数值模拟 *

Numerical Simulation of Operation Process of

关键词:  计算流体力学  Euler方程  旋转爆轰  点火方式  高频振动

Key words:  Computational fluid dynamics  Euler equations  Rotating detonation  Method of ignition  High-frequency vibration

摘要:

为了深入研究旋转爆轰发动机工作过程，采用高精度高分辨率迎风通量分裂格式(AUSMPW+)、氢氧7组分8反应化学动力学模型，求解三维带化学反应的Euler方程。对旋转爆轰发动机工作过程进行了数值模拟，分析了采用预爆轰管点火过程的流场特征以及整个发动机推力、推力偏心距、侧向力随时间的变化规律。计算结果表明:切向预爆轰管紧贴喷注入口时，点火过程仅产生一道单向爆轰波，能成功点燃旋转爆轰发动机；在本文给定的计算条件下，旋转爆轰发动机平均推力约180N，旋转爆轰波传播频率约为14285Hz；旋转发动机正常工作过程中，推力偏心矩、侧向力随时间周期性变化。

Abstract:

In order to study the operation process of rotating detonation engines，three dimensional Euler equations with chemical reactions are solved by coupling with high-resolution upwind flux split scheme (AUSMPW+)，7 species and 8 reaction kinetics model. The operation process of rotating detonation engines are simulated，the flow characteristics of the ignition process using pre-detonation ignition method，the thrust，the eccentric moment of thrust，and the lateral force varying with time are analyzed. Calculation results show that when pre-detonation is close to the injection inlet，ignition can produce detonation wave in a direction，and then allows rotating detonation engine to work properly. In the given calculation condition，the average thrust of the rotating detonation engine is about 180N，and the propagation frequency of rotating detonation wave is about 14285Hz. In the operation process of rotating detonation engines，eccentric moment of thrust and lateral force periodically vary with time.