平板流道交变流动速度环状效应分析

为了分析管内交变流动速度环状效应的特性, 通过数值模拟对平板流道内可压缩交变流动的速度环状效应进行研究. 根据速度环状效应的产生机理, 分析得出在黏性流体管内交变流动中必然存在速度环状效应, 并且在流道截面中心速度为零相位下最容易观察到速度环状效应. 为了定量描述速度环状效应, 根据流道中心速度为零相位下的速度分布曲线的斜率情况, 提出定量评价指标速度环状效应系数, 并针对平行平板流道内层流交变流动,利用该评价指标定量分析了无量纲参数(包括瓦伦西数Va和最大雷诺数Re_max)速度环状效应的影响. 

ANALYSIS OF VELOCITY ANNULAR EFFECT OF OSCILLATORY FLOW INSIDE PARALLEL PLATE CHANNEL

This study focuses on the velocity-annular-effect（VAE） of compressible oscillatory flow inside parallel plate channel.By analyzing the mechanism of VAE,we conclude that VAE,which inevitably occurs in viscous oscillatory pipe flow,is most visible at the phase when the centerline velocity reaches zero.In order to quantitatively evaluate the VAE,coefficient of velocity annular effect（CVAE） was proposed as an index parameter,based on the slope of velocity profile when the centerline velocity reaches zero.Numerical computations with the index parameter CVAE were conducted to analyze the impacts of dimensionless parameters, i.e.,Valensi number Va and maximum Reynolds number Re_max,on the VAE of oscillatory flow inside parallel plate channel.