Fluidic Control of Aerodynamic Forces on a Bluff Body of Revolution

The aerodynamic forces and moments on a wind tunnel model of an axisymmetric bluff body are altered by induced local attachment of the separated base flow. Control is effected by an array of four integrated aft-facing synthetic jet actuators that emanate from narrow, azimuthally-segmented slots, equally distributed around the perimeter of the circular tail end within a small backward facing step that extends into a Coanda surface. The model is suspended in the wind tunnel by eight thin wires for minimal support interference with the wake. Fluidic actuation results in a localized, segmented vectoring of the separated base flow along the rear Coanda surface and induces asymmetric aerodynamic forces and moments to effect steering during flight. The aerodynamic effects associated with quasisteady and transitory differential, asymmetric activation of the Coanda effect are characterized using direct force and PIV measurements.

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