中文摘要：

应用流动显示的方法研究水槽中上游圆柱绕流尾涡与平板边界层的相互作用，发现边界层外的尾涡可以诱导边界层内流体产生新的二次涡结构，对二次涡的产生条件、形成机理和演化规律进行了探讨。结果表明：尾涡／二次涡的相互作用是尾涡与边界层相互作用的核心，尾涡涡脱落St数的变化、尾涡反弹现象、边界层内二次涡的产生和尾涡／二次涡相互作用的不同形态等均与无量纲参数ye／D有关（儿为圆柱距离平板的法向位置，D为圆柱直径），并可以此参数对尾涡／边界层相互作用的特性进行分区。

英文摘要：

The interaction between the wake vortex of the upstream-positioned cylinder and the flat plate boundary layer is investigated using flow visualization technique in the water tunnel. As a result of the inducement from the outer wake vortex, a secondary vortex is found emerging from the boundary layer, whose birth condition, generation mechanism and evolution type is carefully investigated. The result shows that the interaction between the wake vortex and the secondary vortex is the core phenomena to understand the vortex/boundary layer interaction. Moreover, a non-dimensional parameter ye/D is used to descript the influence of both the diameter and the normal position of the cylinder, which divides the vortex/boundary layer interaction into three regimes, characterising the variation of the cylinder wake vortex shedding St number, the rebound of the wake vortex, the generation of the secondary vortex and the different patterns of wake vortex/secondary vortex interaction.