Abstract
The purpose of the present paper is to study the flow structure induced by a combined type of actuator system which is composed of a synthetic jet and fixed vortex generator. The synthetic jet promotes the flow mixing and prevents flow separation, because it introduces a periodic disturbance which is more effective for the flow separation control at low range of the Reynolds number. The negative point is that the jet is not located near the wall, but away from the wall. The fixed vortex generator provides with a longtitudinal vortex structure with a common flow down motion. The vortex structure downstream of the combined actuator was measured by a scanning stereo-scopic particle image velocimetry(SSPIV). An experiment was conducted in the two-dimensional channel flow with the aspect ratio of 12 and channel height of 10 mm where Reynolds number is 1300. Orifice diameter of synthetic jet is 1.0 mm and Stokes number based on the operation condition is 6.3-12.7. Nondimesional stroke length is 2.7-16. Then, it is confirmed from the experiement that strong interaction between the two vortices introduces an effective vortex structure for flow control of the near-wall flow.
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