Abstract
Jets issuing through small holes in a wall into a freestream have proven effective in the control of boundary layer separation. In this study, in order to obtain better understanding of the effect of jet orifice shape on longitudinal vortices, the suppression effect of the jet orifice shape was investigated and the jet velocity distribution was measured. The vortex generator jets with three types of jet orifice (circular, triangular and square orifices) were used in the separation control of the two dimensional diffuser. For the triangular jets, the jet velocity contours are not symmetrically elongated in the spanwise direction, and there is a significant difference in the strength between the positive and the negative vorticities. The triangular orifice produces the strong longitudinal vortices and makes effective the pressure recovery in the diffuser in contrast to the other orifice shapes.
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