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中文摘要：
二维后向台阶分离流动是研究流动分离再附特性及机理的经典物理模型.运用二维时间解析粒子图像测速（PIV,Particle Image Velocimetry）技术,对雷诺数在300~3 000之间后向台阶分离再附流动进行了二维速度场测量,研究后向台阶层流剪切层转捩位置随雷诺数的变化.研究发现,随雷诺数的增大,再附点的位置不断前移,转捩点的位置随之前移.转捩点在剪切层中的相对位置与雷诺数成反比函数关系.另外,在转捩发生之前,扰动会经历一段线性增长阶段,其空间增长率与雷诺数正相关.
英文摘要：
The backward-facing step flow is a classical model for the investigation of shear layer separation and reattachment characteristics. The transitional shear layer and its Re dependence was discussed by using two-dimensional time-resolved particle image velocimetry（ PIV） measurement. It was observed that the location of reattachment point moves upstream if Re increases,while the transition point of the shear layer moves forward at the same time,leading to the dimensionless reattachment length inversely proportional to Re.In addition,before the transition occurs,the perturbation contained within the shear layer presents initial exponential growth,whose spatial growth rate is positively correlated with Re.
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