Abstract
The vortex generator jets (VGJs) method can control flowfields or especially suppress flow separations in a wide range of conditions. The experiments were conducted using a low speed wind tunnel with a two-dimensional diffuser. To make better separation control we investigated the effect of jet orifice shape. Orifices of square and triangle shapes were investigated instead of circular ones. Vorticity distributions, secondary flow vectors and the static pressure in the divergent portion of the wind tunnel were measured. At the pitch angle which affects heavily flowfields, 30deg., for triangle orifices, pressure recovery was improved. Orifice shapes result in the difference of separation control.
