非结构网格高超声速绕流数值模拟及涵道构型减阻特性分析

在非结构网格上对二维高超声速化学非平衡粘性绕流进行了数值模拟，并应用此方法对涵道构型高超声速减阻特性进行了数值分析。空间离散采用VanLeer逆风通量分裂格式，时间推进采用显式的Runge—Kutta格式。化学非平衡动力学模型为五组元五反应模型，对化学反应源项进行了点隐式格式处理，温度场的计算采用牛顿迭代法。分别对二维类弹头体涵道构型、二维半圆柱模型的高超声速绕流流场进行了数值模拟，得到了数值结果，并与完全气体绕流计算结果进行了对比分析。结果表明本文方法可以应用于高超声速绕流计算，并且涵道构型具有高超声速减阻特性。

Numerical Simulation for Hypersonic Flow on Unstructured Grid and Analysis of Drag Induction Effects on Channel-Configuration

Numerical methods for hypersonic flow with chemical non-equilibrium reactions on the unstructured grid are used to analyze the drag induction of channel-configurations. The flow control equations i.e. Navier-Stokes equations with chemical non-equilibrium reactions are considered. Numerical scheme of finite volume based VanLeer flux splitting scheme on unstructured grids is used for inviscid terms, central difference method for viscous terms, and explicit 5-steps Runge-Kutta scheme for time step. The chemical reaction model is five species and five reactions (non-ionization considered), the point implicit scheme is used for the chemical source, and the Newton iterative method is implemented in the calculations of the temperature distribution. Numerical results are compared with the perfect flow without chemical effects.