Effect of DFC Parameter on Flow Control Around Wings with PSJA

Abstract

Flow around wings was investigated with plasma synthetic jet actuator. Plasma synthetic jet actuator is a flow control device which is composed of the electrodes with A.C. signal, using electro hydrodynamic (EHD) effect and induces a flow around the electrodes. From the characteristics of electrical device, plasma synthetic jet actuator has some important advantages; for example, miniaturization, maintenance free, and easy to control. From these characteristics, it is effective to apply flow control around wings. In this study, the experiment is held to see effect of the delayed feedback control (DFC) parameter of DFC on plasma synthetic jet actuator placed on the surface of the wing. A NACA0012 wing with plasma synthetic jet actuator is set in the wind tunnel. The parameter τ as the time delay parameter for delayed feedback control is varied to see the effect and change to the flow condition. From the experimental result, the flow velocity converged to certain stabilized periodic motion especially where the τ has shown the most actuating effect. As the characteristic of DFC, the controlled object converges to a limit cycle with the period of τ . In this paper, the flow has converged to the limit cycle with the period respectably linear to the time delay τ but different from its value of the time delay itself. Also, the change of the flow velocity effects the periodic cycle of the flow.