Direct measurement of wall-shear stress of plane shear layer with plasma synthetic jet actuator

Abstract

One of the useful ways to measure the effect of the flow control devise is to use the wall-shear stress sensor to measure the wall-shear stress directly. The sensor used in this study measures the force produced by the wall-shear stress, which is reduced by the flow control devise. In this paper, the wall-shear stress of the plane turbulent shear layer with the plasma synthetic jet actuator (PSJA) is investigated. PSJA is a flow control device composed of electrodes with A.C. signal. The actuator uses electrohydrodynamic (EHD) effect and induces flow around the electrodes. Plasma synthetic jet actuator has great advantage such as the miniaturization, maintenance free, and easy to control compared to other actuators. In this paper, the wall-shear stress of the flow in a lowspeed wind tunnel is observed to experiment the effect of the PSJA to the plane turbulent shear layer. The results show that the PSJA changes the flow condition of shear layer by accelerating the flow in the shear layer.