平行边壁剪切流的雷诺数与摩阻流速特性初探

A Discussion of the Properties of Reynolds Number and Shear Velocity of Parallel Wall-Bounded Shear Flows

应用涡动力学观点,分析平行边壁剪切流的流动特性和从层流到湍流转捩的特点;对雷诺数和摩阻流速的概念及他们之间的关系进行分析和评述;给出了雷诺数的不同表达形式,把它与脉动过程和失稳机制联系起来,弥补以往的动力学参数缺乏流动物理机制的不足;最后,指出摩阻流速实际上是反映流场与边壁互相作用的一个系统整体参数.

From the viewpoint of vortex dynamics,the flowing properties of parallel wall-bounded shear flows and the characters of transition from the laminar flow to the turbulent flow are analyzed,and the concepts of the Reynolds number and the shear velocity and their relations are reviewed and studied.The different forms of the Reynolds number are presented to relate it to the fluctuating and the breaking down processes to show its dynamical mechanism.The shear velocity is,in essence,a comprehensive parameter to measure the interactions between the flowing field and the boundary conditions.