高速气流冲击柱状泡沫多孔体的传热特性分析

采用流体/多孔区域一体化单区域算法，数值研究了高速绕流条件下前置于圆柱体前缘表面的柱状泡沫多孔体内部的传热特性。基于蒙特卡罗法考虑多孔域内的辐射热效应，分析了变化多孔区域长度和多孔阻力特性对模型激波阻力和前缘多孔区域气动热的影响。结果表明:在圆柱体前缘安置一定长度及带有适当阻力特性的泡沫多孔材料，可同时减小整体激波阻力并降低前缘表面的气动热效应。在模拟工况下，无量纲长度1.0、黏性阻力系数0.2×107m-2及惯性阻力系数200m-1的前缘泡沫多孔可减小激波阻力13.5%，降低约75%的前缘表面的平均气动热流密度。保持无量纲长度不变，减小泡沫多孔区域惯性阻力系数会降低激波阻力，但会略微增加前缘壁面气动热流密度。 

Analysis of heat transfer characteristic of cylindrical foam porous block with high speed flow around

Numerical investigation on heat transfer characteristic inside the cylindrical foam porous block attached to frontal surface of cylinder body with high speed flow around was performed by employing single-domain approach through integration of fluid and porous region. Radiation effect within porous region was considered based on Monte Carlo method. The influences of variable porous region length and porous drag characteristic on both the wave drag of entire model and the aero-heating effect of frontal porous region were analyzed. The results show that installation of certain length porous foam material with appropriate drag characteristic in front of the cylinder body can reduce both the wave drag of entire body and aero-heating effect of the frontal surface. Under simulation condition, the frontal foam porous with parameters (dimensionless length 1.0, viscous coefficient 0.2×107m-2 and inertial coefficient 200m-1) can reduce 13.5% of the wave drag and approximately 75% of the frontal surface average aero-heating heat flux. With the dimensionless length being kept unchanged, the wave drag was decreased with the decline of inertial coefficient of foam porous region, whereas the aero-heating flux of frontal surface was slightly increased.