H_2／O_2燃烧的超声速非平衡流动的数值模拟

NUMERICAL SIMULATION OF SUPERSONIC NONEQUILBRIUM FLOWS FOR H_2/O_2 COMBUSTIONS

本文从包含组分方程的完全ＮＳ方程出发，采用ＮＮＤ格式和Ｈ２／Ｏ２燃烧模型，通过求解ＮＳ方程，模拟了具有压缩拐角的二维管道和球头两类激波点火、燃烧流动。计算清楚地给出了流场中的激波、爆震波以及各种物理量的分布，并分析了激波、爆震波及其相互之间的耦合。在此基础上，讨论了稀释剂添加情况对流场的影响。计算中为了解决耦合方程组的刚性，提高计算的稳定时间步长，对化学生成源项，妥善地采用了隐式处理技术。

Navier-Stokes equations governing the supersonic H2/O2 combustion flows with nonequilibrium chemistry have been solved numerically(Two chemical reaction models,One with two reactions and the other with eight reactions have been adopted. In order to capture the shock wave and detonation wave satisfactorily and over come the stiffness of the individual species continuity equations,the high resolution NND-4 scheme presented by Zhang and the implicit treatment of the chemical source term are used. Results obtained for shock-induced ignitions of 2-D compression corner of ramped duct and sphere are presented. The flow features,such as shock waves,detonation,Von Neumann spike of the density distribution and so on,are given clearly.