摘要
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 thernlochemical nonequilibrium flow coupled with radiation is carefully in restigated. In the thermochemical-kinetic aspect, the thermal and chemical nonequilibrium model and the two--temperature thermal model are used. The full Navier-Stokes equations are regarded as the governing equations. Consider the reaction air model with eleven chemical species: N_2, O_2, N, O, NO, NO^+, N_2^+, O_2^+, N^+, O^+, e^--. Charge neutrality is assumed throughout tile flow field. In the radiation aspect, the 'line-by-line' radiation model is developed. The thermochexnical nonequilibrium flow coupled with radiation is simulated numerically with this model. The NND scheme and the time-dependent shock capture method are used in the computation. Since vibration time scale, chemical time scale and flow time scale are extremely different. We may come across stiffness problem. In this thesis, time preconditional matrix technique is used for numerical solution, showing that the time preconditioner can deal with difficulties due to stiffness. When coupled with radiation, the radiative flux divergence term is involved in the energy equation. It. may introduce additional iterations. We use the 'double circulation' model to speed up convergence. Finally, the flow field around a symmetric capsule FIREII is numerically simulated. Radiative heat transfer and radiation spectrum are obtained and compared with experiments and previous research.
出处
《力学学报》
EI
CSCD
北大核心
2000年第5期541-546,共6页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金!(9188010)&&
