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Rapid modification of the flow field about a free moving airfoil by controlled, trapped vorticity concentrations

Daniel P. Brzozowski
Graduate Research Assistant, Woodruff School of Mehcanical Engineering Georgia Institute of Technology, Atlanta, Georgia, USA

Ari Glezer
George W. Woodruff School of Mechanical Engineering Georgia Institute of Technology 771 Ferst Drive, Atlanta, Georgia 30332, USA

Abstract

The dynamic coupling between trailing edge flow control and the unsteady motion of a maneuvering airfoil is investigated in wind tunnel experiments. The airfoil is mounted on a 2-DOF traverse and the commanded maneuvers are effected without moving control surfaces. Bi-directional changes in the pitching moment over a range of angles of attack are effected by controllable, nominally-symmetric trapped vorticity concentrations on both the suction and pressure surfaces near the trailing edge. Manipulation and regulation of vorticity concentrations are effected by hybrid actuators comprised of a miniature [Ο(0.01c)] obstruction integrated with synthetic jet actuators.