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采用计算流体力学(CFD)方法对燃烧室一维冷流和两维燃烧过程进行了数值仿真,着重研究了温度、密度、熵等变量的脉动与压力脉动的区别,以及喷射过程与声学振型的耦合。结果表明,压力和速度主要表现声特征,温度和密度部分表现声特征,部分表现流特征,而熵则只表现流特征。对于化学反应过程激发的燃烧振荡,最容易受到激发的振型是压力波腹与化学反应分布相关最强的振型。
Computational fluid dynamics (CFD) method was used to simulate the one-dimensional cold flow and two-dimensional combustion process in the combustion chamber. The difference between the pulsation and pressure pulsation of temperature, density and entropy variables was emphasized. And the relationship between the injection process and acoustic vibration mode Coupling. The results show that the pressure and velocity mainly show the acoustic features, the temperature and the density partly show the acoustic features, the partially express the stream features, and the entropy only show the stream features. For the combustion oscillation excited by the chemical reaction, the most easily excited mode is the mode that the pressure antinode has the strongest correlation with the chemical reaction distribution.