Unsteady Flow Characteristic and Separation Control of Lifting System Under High Angle of Attack
The experimental study and numerical simulation on unsteady flow characteristics of the lifting systems, including two-dimensional airfoils and wing-body configurations have been performed at high angles of attack, with the emphasis placed on the flow phenomena induced by the time-dependent motion of the body itself or by the external excitations imposed on the flow field. The excitation methods used to control the flow in this investigation are :local flow field perturbations and the interactions of a moving vortex imposed on the flow with the separated flow from the body surface. It is found that, at high angle of attack near or beyond the static stall angle, by means of the appropriately selected unsteady excitations, the favorable effects of alleviating the separation, delaying the stall and enhancing the aerodynamic efficiency can be achieved successfully.
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