Experimental and Computational Study on Flow Characteristics by Synthetic Jets Configuration

Abstract

Synthetic jets have been used in a variety of flow applications, and there have been a lot of studies on the possibilities of synthetic jets as a flow control device. Many experimental and numerical researches are reported on the jet structure with cross flow, the jet evolution in the quiescent condition. However, some issues are not fully investigated yet, such as an optimal exit configuration for flow control, and so on. Jet exit configuration strongly affects the vortex developing process which determines the mechanism of jet momentum transport. In this study, the flow characteristics of synthetic jet depending on jet exit configuration are investigated using experimental and numerical approaches. Two exit configurations are selected, one is a conventional rectangular slot type and the other is a serial circular slot type. In the quiescent condition, velocity profiles of the two type jets are examined using hot wire measurement and numerical computations, and the jet interaction with cross flow is investigated. Detailed comparison of the static velocity data shows the difference of flow evolution structure induced by the two type jets, and the dynamic data reveal how each of exit configuration interacts with surrounding cross flow.