钝锥有攻角分离流动的数值模拟及其分析

本文定性分析了开式分离的性状,并对钝锥有攻角超声速绕流的开式分离作了数值模拟。分析指出,开式分离可能存在两种形态,第一种分离线的起点为正常点,第二种分离线的起始为鞍、结点(包括螺旋点)的组合。对于第一种形态,分离线的起点是横向分离的起始点,除分离线外,分离面上的流线不是从分离线的起点发出的。对文中计算的情况,流动属第一种开式分离。计算证实了定性分析的结论。计算和分析均指出,对第一种开式分离,在分离的起始区域,分离流面尚未卷曲,但在下游,则变成卷曲面。文中还研究了围绕物体的流管在分离诱导下的变形情况。

NUMERICAL SIMULATION AND ANALYSIS FOR HYPERSONIC FLOW WITH SEPARATION OVER BLUNT CONE AT ANGLE OF ATTACK

The nature of an open separation has been analysed qualitatively and the numerical simulation has been made for the hypersonic flow with an open separation over the blunt cone at angle of attack. It is now recognized that the starting point of an open separation line is one of two kinds as shown in figure 1 and 2. The first kind was first proposed by K. C. Wang. The starting point is a regular point. The second kind is depicted in figure 2. The upstream separation line is the combination of saddle point and nodal point. In this paper, the spatial flow pattern of an open separation for the first kind is also studied. The crossflow separation exists along the separation line and begins from the starting point of an open separation line. This is no streamline passing through a starting point on the separated flow surface except for the separation line itself.