摘要
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。计算结果表明：稀薄程度对壁面物理量和流场结构有十分显著的影响，热力学和化学非平衡效应显著。随着高度降低，壁面催化率对壁面热流量等有明显影响。而流场沿物面方向变化比较缓慢，应用较粗的沿壁向网格也可以得到满意的宏观结果。最后，我们作了球体绕流的数值模拟并与半球头柱头部热流量的实验结果作了比较，二者符合良好。
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.
出处
《空气动力学学报》
CSCD
北大核心
1995年第4期405-413,共9页
Acta Aerodynamica Sinica
基金
国家自然科学基金
关键词
DSMC方法
壁面催化
稀薄
高超声速流
DSMC method, nonequilibrium, surface catalysis,rarefac-tion, hypersonic flow.
