基于波传播算法的火焰不稳定性

基于波传播算法构造了多组分反应流的数值格式,利用CH4空气基元反应动力学模型,并采用分离算法,对CH4空气混合物中,入射激波与火焰的相互作用,以及反射激波与火焰的二次作用过程进行了数值模拟.根据计算结果,讨论了激波诱导火焰失稳的发展过程及其特点.结果表明,Helmholtz不稳定、RichtmyerMeshkov不稳定以及反应放热速率对火焰失稳过程有重要影响.计算结果与实验结果进行了比较,对数值方法的有效性进行了验证.

A Study of Flame Instability with Wave Propagation Algorithm

Based on the wave propagation algorithm, a numerical scheme of muhi-component reactive system is constructed. The interaction between the incident shock wave and the flame bubble, and between the reflected shock wave and distorted flame of the CH4/air mixture are investigated numerically in the CH4/air elementary, reaction model and the splitting method. The evolution and properties of the flame instability induced by incident and reflected shock waves are discussed. The computation indicates that the Helmhohz instability, Richtmyer-Meshkov instability and chemical heat release rate play important roles in the interaction between shock waves and the flame. The calculated results are compared with experimental ones, and an agreement is shown.