钝体高超声速三维分离流场特性数值研究

以双子星座简化外形为模型，通过有限差分法求解全Ｎ－Ｓ方程，数值研究了高超声速绕流中的三维分离流动特性。来流Ｍ＿∞＝７．０，Ｒｅ＿∞＝４．５×１０￣５，攻角范围为１０°－４０°。首先通过与实验油流照片的比较，证明了本文计算分离结构定性上的正确性。然后研究了不同攻角下背风面三维分离结构的变化，给出了柱段背风区常点型开式分离随攻角变化转变为整体闭式分离的过程，并从物理上分析了这种转变过程的合理性，认为不同分离形态在分离线起始点附近都有共同的压力条件，即垂直于分离线的逆压梯度，因此横向分离可以从常点型开式分离直接转化为闭式分离。

NUMERICAL STUDY OF THREE-DIMENSIONAL SEPARAIED FLOW OVER A BLUNT BODY AT HYPERSONIC SPEED

The study of three-dimensional separation over a capsule-type vehicle at hy- personic speed are carried out using the finite difference numerical method with M_∞= 7.0,Re_∞=4.5 ×10￣5. Five kinds of topological pattern on the vehicle surface are found when the angle of attack is increased from 10°to 40°,and the transition process from regular open separation to close separation on leeward surface are sliown. Analysis shows that different separation patterns are caused by same pressure condition adverse pres...