VISUALIZATION OF FLOW STRUCTURES IN A TURBULENT BOUNDARY LAYER USING A NEW TECHNIQUE

摘要

In this paper, an experimental investigation on the flow structures in a turbulent bounda-ry layer employing a special laser light sheet-Hydrogen bubble flow visualization technique is described.It is observed that the high/low speed streaks are directly related to the hairpin or horseshoe-likevortices. This observation can give a better understanding of the physical mechanism in the turbulentboundary layer.