有压力梯度湍流边界层条纹结构的流动显示

A Visual Study of Streaks of a Turbulent Boundary Layer in the Flow with Different Pressure Gradients

本文利用氢泡技术对有压力梯度的湍流边界展进行了流动显示的研究,发现在不同的压力梯度下条纹结构的形状以及强度等发生了变化,得出:逆压梯度能够激励和促进湍流边界层条纹结构的发生和发展。

The streaks of a turbulent boundary layer in the flow with different pressure gradients was inves-tigated with hydrogen bubble technique. The shape, scale and intensity of streaks for different pressure gradi-ents were different. The coherent structures were suppressed in flow with favourable pressure gradient and were enhanced in flow with adverse pressure gradient.