湍流边界层中马蹄形涡的形成方式

THE WAYS OF THE FORMATION OF THE HORSESHOE VORTEX IN TURBULENT BOUNDARY LAYER

本文使用一种新的流动显示方法——激光片光运动法和几种实验技巧对湍流边界层中的马蹄形涡进行了观测,发现并描述了其形成的四种方式:二次不稳定式、组合式、变形式和突发式。对这四种马蹄形涡的形成及发展进行了研究和比较。实验结果表明,这些马蹄形涡在尺度、运动速度和变形上是有差别的。

Experimental observation and measurement were performed for the horseshoff ortex in turbulent boundary layer through using a new method of visualization-moving sheet of laser light and several experimental skills. It was discovered and described that the horseshoe vortices form in four ways: secondary instability, combination, deformation and burst. The formation and development of these horseshoe vortices were studied and compared. The test results show that these horseshoe vortices are different in size, moving velocity and deformation.