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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yc/D有关(yc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。
The application of the flow display method to study the interaction between the wake vortex and the slab boundary layer in the upstream of the flume shows that the wake vortex outside the boundary layer can induce a new secondary vortex structure in the fluid in the boundary layer. , Formation mechanism and evolution law were discussed. The results show that the interaction between the wake vortex and the secondary vortex is the core of the interaction between the wake vortex and the boundary layer. The variation of the number of tail vortex shedding St, the vortex wake vortex, the secondary vortex in the boundary layer and the vortex / The different forms of the secondary vortex interaction are all related to the dimensionless parameter yc / D (yc is the normal position of the cylinder from the slab and D is the diameter of the cylinder), and this parameter can be used to partition the vortex / boundary layer interaction characteristics .