Abstract
Development of a vortical structure over a delta wing with an oscillating leading-edge flap is studied experimentally. The base delta wing has a 60-deg sweep-angle and was inclined at 25 deg angle of attack. The width of the leading-edge flap varies from the apex to the trailing edge of the wing, forming a triangular shape of 5-deg apex angle. As the leading-edge flap is deflected statically on the windward side, the flow structure strongly depends upon the angle of attack and the flap deflection angle. Significant delay of the vortex breakdown location can be attained while the time scale (or the period) of the oscillating leading-edge flap is close to one convection time scale. When the oscillating leading-edge flap has a period much shorter than the convection time scale, the effectiveness in delaying the vortex breakdown location is reduced. Meanwhile, the development of vortex breakdown experiences a certain amount of time delay (or phase shift).
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