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

作　　者：刘兆存[1] 范玮佳[1] 傅华[1] 邓宇中[1] 吕坤能[1] 

机构地区：[1]重庆交通大学内河航运行业重点实验室与省部共建水利水运工程重点实验室,重庆400074

出　　处：《西南大学学报（自然科学版）》2011年第7期21-25,共5页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市教委基金资助项目(KJ110415);省部共建水利水运工程重点实验室资助项目(SLK2009A01;SLK2010B03);重庆交通大学青年基金资助项目(XN-2009-04)

摘　　要：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.

关 键 词：雷诺数 摩阻流速 涡动力学 

分 类 号：O357.5[理学—流体力学] TV131.21[理学—力学]