基于新型解耦算法的激波诱导燃烧过程数值模拟

Simulation of shock induced combustion based on a novel uncoupled method

摘要

摘要:对一种模拟化学非平衡流动的时间和空间二阶精度新型解耦算法进行两方面改进，流动算子采用基于Runge-Kutta方法的时间格式以后, 可以推广到更多的空间差分格式，化学反应源项求解算子可以采用梯形公式、拟稳态逼近法和变系数常微分方程求解器. 对H_2/Air预混气体中激波诱导振荡燃烧的Lehr试验进行模拟，考察了化学动力学模型、网格尺寸和差分格式耗散大小对计算结果的影响，同时对不同的化学反应源项算子求解算法的计算效率进行了比较.

Abstract:This paper improved a novel uncoupled method of simulating chemical non-equilibrium flow whichwas introduced in Ref.1. The flow operator can be numerical solved by Runge-Kutta method; the reaction operatorcan be solved by trapezoidal rule, quasi steady state approximation and VODE.The oscillating shock-inducedcombustion experiments conducted by Lehr had been studied, and the numerical scheme and stiff ode solver wereevaluated. The effects of computing grid and chemical reaction mechanism also were studied.Key words chemical non-equilibrium flow, uncoupled method, numerical method刘