Unsteady Aerodynamic Flow Control of Moving Platforms

摘要

This ARO program focused on the experimental investigation of fundamental flow mechanisms that are associated with transitory aerodynamic forces and moments effected by fluidic actuation on the flow boundaries of stationary and moving platforms. Aerodynamic forces and moments are induced on a movable, wire-mounted wind tunnel model of an axisymmetric bluff body with novel embedded fluidic actuation for aft-body control. Control is effected fluidically by interactions of azimuthally- and streamwise-segmented individuallyaddressable synthetic jet actuators with the embedding flow over the platform. The interaction between the actuation and the local cross flow over the moving surface is investigated using high-resolution PIV, while the global aerodynamic effects are assessed from the timeresolved force measurements. Of particular interest is the transitory onset and evolution of streamwise vorticity concentrations, which are amplified by the body-tailored adverse pressure gradient, and their effects on three-dimensional separation.