小能量点火脉冲爆震发动机工作过程数值模拟

摘要

The research presented in this paper focuses on the simulation of the operation of pulse detonation rocket engine （PDRE） with small energy ignition model, for the aim to form a better numerical simulation method. A finite-rate chemistry computational fluid dynamics model and second order upwind scheme are used in the 2-D simulation of PDRE working processes. Spark ignition model in CFD software is used to simulate the spark plug ignition（50 mJ）which is also used in the experiment. The results of simulation are well agreed with those in our experiment. It is demonstrated that the methods of mesh generation and calculation in this paper can be used in the simulation of working process of PDRE initiated by small energy ignition.%为完善脉冲爆震发动机数值模拟模型，采用有限速率化学反应模型，通过二阶迎风格式差分逼近二维欧拉方程，模拟以煤油和氧气为可爆混合物的小能量点火触发爆震的脉冲爆震发动机工作过程。采用CFD软件中spark ignition模型模拟实验中电火花塞点火，实现了50mJ小能量点火触发爆震。数值模拟结果和试验结果吻合，说明所采用的计算方法和网格生成方法，可以用于小能量点火触发爆震情况下脉冲爆震发动机完整工作循环的数值模拟。