An experimental study of controlling the flow over highly slender, sharp-edged bodies at high angles of attack was conducted, Four forebodies with similar planform shape will be studied: an 80-deg sweep delta wing, a diamond-shaped forebody, and two chine forebodies with different cross sections, A small flat plate used as a flow deflector on the leeward side was used as the vortex control device, Significant controlled forces and moments can be produced on all the forebodies, especially at high angles of attack, The optimal position of a deflector is inboard of the leading edge for the delta wing, and at the leading edge for the other forebodies, On the delta wing, the deflector induces a vortex that situates closer to the surface than the vortex on the side without the deflector, The opposite is true for the other forebodies, Changing the height, location, deflection angle; and shape of the deflector alter these vortex behaviors, which in-turn changes the forces and moments, At very high angles of attack the deflectors promote vortex breakdown, and the control effectiveness thereby is diminished.
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