Abstract
An active dimple with oscillating bottom surface was developed for flow separation control. It can provide a periodic disturbance into the flow by means of piezoelectric element. In this study, the basic characteristics of the active dimple are obtained by measuring the induced flow around dimple using dynamic PIV. The dimple diameter is 5 mm and Reynolds number of the cross flow based on the channel height is 650. The induced flow of solid dimple indicates the maximum value with the dimple depth of 0.5mm. It is found that the active dimple causes stronger induced flow than that in the solid dimple. Moreover, frequency of the induced flow from the active dimple can be easily controlled.
