从耦合辐射的轴对称热化学非平衡N-S方程出发,采用双温度、11组元反应气体模型,耦合``线-线''精细辐射模型,利用隐式NND有限差分格式和时间预处理技术数值求解了FIREII飞船热化学非平衡辐射流场,得到了有关辐射热和辐射光谱计算结果,并与有关文献的实验结果和计算结果进行了比较.%In this thesis, the thermochemical nonequilibrium flow coupled withradiation is carefully in restigated.rn In the thermochemical-kinetic aspect, the thermal and chemicalnonequilibrium model and the two-temperature thermal model are used. Thefull Navier-Stokes equations are regarded as the governing equations.Consider the reaction air model with eleven chemical species: N2,O2, N, O, NO, NO+, N2+, O2+, N+, O+, e-. Chargeneutrality is assumed throughout the flow field.In the radiation aspect, the ``line-by-line'' radiation modelis developed. The thermochemical nonequilibrium flow coupled withradiation is simulated numerically with this model.rn The NND scheme and the time-dependent shock capture method are used inthe computation. Since vibration time scale, chemical time scaleand flow time scale are extremely different. We may come acrossstiffness problem. In this thesis, time preconditional metrix technique is used fornumerical solution, showing that the timepreconditioner can deal with difficulties due to stiffness.When coupled with radiation, the radiative flux divergence term isinvolved in the energy equation. It may introduce additional iterations. We use the``double circulation'' model to speed up convergence.rn Finally, the flow field around a symmetric capsule FIREII is numericallysimulated. Radiative heat transfer and radiation spectrum are obtainedand compared with experiments and previous research.
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