激波在平板上诱导的旋涡强度的测量

The Measurement of Strength of Vortices Induced by a Shock Wave on an Inclined Plate

运动激波通过两个等攻角平板后诱导出两个同向旋转的旋涡，这两个旋涡在随当地气流向下游运动的同时，绕涡核连线中心旋转。本文通过测量涡对的转动角速度，获得了每个旋涡的强度。实验结果表明，由此测得的旋涡强度不同于用小攻角平板起动涡公式计算的起动涡强度。

When a moving shock pass through two plates with equal angle of attack,two co-rotating vortices are induced.Both vortices move with the flow behind the shock wave, and simultaneously,rotate around the center of the vortex pair. In present paper,the angular velocity of the co-rotating vortex pair is measured, then the strength of the vortices is obtained.The result shows that the measured strength of the vortex is not equal to the strength of the impulsive motion of the plate with a small angle of attack.