1619 Periodic Behavior of Longitudinal Vortices for Pulsed Vortex Generator Jets
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Vortex Generator Jets (VGJs) have significant effects on separation control. The longitudinal vortices generated by VGJs embedded in the boundary layer ware investigated experimentally. In this study, to understand the reasons why the vortices for T-shaped jet orifice case behave in a manner different from those for the circular jet orifice case, velocity measurements were carried out in various phases of issuing jets discretely (pulsed jets).The pulsed VGJs with T-shaped orifices make the separation control effective in contrast to the circular jet orifice case. The pulsed VGJs with T-shaped orifices promote the interaction between adjacent vortices, and the strong longitudinal vortices were generated in the region close to the lower wall. The different feature of longitudinal vortices between the T-shaped jets and the circular jets can be explained by considering the vortex behavior in each phase of pulsed jets.
