Effect of orifice shape on interaction between synthetic jets and crossflow

A Synthetic jet device is a tool for generating a jet, and a useful tool for active flow control. Synthetic Jet actuators are low operating power, zero-net-mass-flux and very compact devices. Therefore, a synthetic jet is expected as a new method of boundary layer control. The orifice shape is an important parameter, which have an effect for boundary layer control. However, the effect of non-circular synthetic jets for boundary layer control is unknown. The purpose of this study is to investigate the effect of orifice shape for boundary layer control. In this experiment, circular orifice and two rectangular orifices were used. For the rectangular orifices with long side set in the spanwise direction, the boundary layer mixing is promoted and makes effective the separation control.