Wake Flow Stabilization by the Action of Base Bleed

Abstract

Experimental investigation into the effects of base bleed on wake stabilization for the suppression of flow-induced oscillation has shown that when the bleed flow rate is increased, the initial vortices are formed downstream, thus constituting the main cause of the removal of vortex excitation from the body which has produced them. Base ejections, if unsuitably placed, however, could aggravate oscillation. In wake buffeting, the situation can be greatly improved if base bleed is introduced from the downstream body but not from the upstream body.