过渡领域高超声速圆柱绕流直接模拟

本文用直接模拟蒙特卡罗方法模拟了再入速度为７．５ｋｍ／ｓ，高度分别为８０、８５、９０ｋｍ，物壁是完全漫反射有限催化壁的圆柱绕流。在８０ｋｍ考察了壁面催化率的影响。

The Monte Carlo Direct Simulation of the Hypersonic Nonequilibrium Flow Past a Circular Cylinder in Transition

Presented are the results of Monte Carlo direct simulation of hypersonic flow past a circular cylinder for reentry velocity of 7,5km/sand altitudes of 80km, 85km and 90km,The wall is assumed to be diffusewith full thermal accommodation and finite catalysis. The numerical simu- lation shows that the effect of rarefaction on the wall physical qualitiesand flow field structure is significant, the thermodynamic and chemicalnonequilibrium effects are evident, and that the effect of the surface recom-bination probabilities on the surface heat transfer is more evident at loweraltitudes. As the flow field characteristics change slowly along the wall di-rection, satisfactory macroscopic results are obtained with relatively coarsegrid along the wall. Finally, a DSMC calculation of the flow around asphere is made and the heat transfer rate is compared with the measurementsobtained in a hypersonic wind tunnel by Boylan, The results are shown to bein good agreement.