Abstract

In this study, a synthetic jet array which can be actuated and injected individually at the different phases is employed. Influence of the phase difference on reattachment process and flow structure in the low Reynolds number flow over a backward facing step is discussed. Flow visualization and measurement of near-wall flow using the micro flow sensor are conducted. In counter-phase injection, the excitation of the separating shear layer and the transverse vortex structure are different from those in common-phase injection. It is also found from the wall shear stress measurement that the transverse vortex structure is affected by the strength of the vortex which is induced by each synthetic jet.

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