冲压发动机点火前内流场数值仿真研究

冲压发动机在点火前由于燃烧室的压力较低,内通道流场状态与发动机正常工作时的差别很大。因此,在发动机设计时,必须要考虑形成正常点火条件对发动机结构的约束。本文利用有限体积法对N-S方程进行空间离散,对发动机点火前的不同内通道结构下的冷流场进行了数值模拟,结果表明稳定器和喷油装置对形成合理的点火条件很重要,稳定器的布局对点火状态有很大影响。

Numerical study of the ramjet engine inner flow before ignition

Inner flow states of a ramjet engine before ignition is very different from those under normal operation conditions because of the low chamber pressure. So when design an engine, the limits for the engine structure has to be considered so as to form an appropriate ignition condition. This paper simulates the flow field with different inner configurations using finite volume method discretization N-S equations. The simulation results show that the flame holder and injector are important to a proper ignition condition, and the arangement of a flame holder has great effect on ignition conditions.