热化学非平衡流场辐射特性数值计算

设计了耦合辐射的三维热化学非平衡流场计算方法，以适用于任意形状的网格。采用Jameson有限体积法求解耦合辐射源项的三维N-S方程。化学模型包含11个组元，20个化学反应。辐射源项通过直接求解辐射输运方程RTE获得。在空间和方向上分别离散后，利用有限体积法求解不同方向上的辐射输运方程，精确计算了波长为100-1500nm所有主要组元的吸收系数，逐条计算了目前已观测到的空气组元的原子谱线，而对分子的带状谱采用了带模型计算，并最终得到了驻点处辐射密度随波长变化的分布情况。

NUMERICAL SIMULATION OF THERMAL NON-EQUILIBRIUM RADIATION ON UNSTRUCTURED GRIDS

A numerical method is developed based on an unstructured mesh to compute an ionized hypersonic flowfield with radiation in the thermo-chemical nonequilibrium. The flowfield is described by multi-species Navier-Stocks equations. The chemical model includes 11 species (O2,N2,O,N,NO,NO ,N ,O ,N 2,O 2,e-) and 20 reactions. For simulating the thermal non-equilibrium effect, the two-temperature model is considered. The finite volume method (FVM) used for the spatial and directional discretization of radiative transfer equation(RTE) is described for unstructured grids. The numerical code can handle different kinds of species and radiative bands in a gas thermodynamicly described by two temperatures. In particular, the Delta, Epsilon, Beta prime, and Gamma prime bands of NO are choosen and the distribution of the radiation intensity is obtained.