周期的擾乱を与えた水平二平板後流の渦構造の解明

抄録

A wake without reverse flow like a flat plate wake is a very unstable flow, and the vortex structure in such a wake is affected by various disturbances in main flow. In this study, the vortex formation process in the wake of the flat parallel plates with periodic disturbance was shown by using flow visualization technique in order to control the wake structures by disturbance frequency. As a result, it was found that the lock-in phenomenon of the vortex shedding frequency occurs when the disturbance frequency is close to the natural vortex shedding frequency, but the flow pattern changes sensitively depending on the disturbance frequency even the lock-in occurs.