不同形状随行波湍流边界层减阻特性研究

Drag-reduction Characteristics of Turbulent Boundary Layer Flow over the Variform Traveling Wave Surface

针对U型,V型,半圆型三种不同形状的随行波,对它们的湍流边界层减阻特性进行了研究。通过比较其粘性底层厚度,湍流强度,壁面剪切应力,摩擦阻力系数,得出:V型和U型湍流边界层阻力特性相似,且均优于半圆型随行波;U型随行波减阻效果比顶角角度较小的V型稍好,但是如果将V型顶角增大会得到更好的减阻效果。

Concerning characteristics of turbulent turbulent intensity, wall bo sh with the V, U and semicircular traveling wave, the drag-reduction undary layer are studied. By comparing their thickness of viscous sublayer, ear stress and friction coefficient, it is found that the drag-reduction characteristics of V and U travelling wave are similar, and both of them are better than semicircular travelling wave. Furthermore, U is a little better than V, whereas, better drag-reduction characteristics can be＇got by increasing the angle of V.