Abstract
An investigation into the effects of spanwise camber in the form of anhedral and dihedral on a 75-deg sweep delta wing is detailed. Data are presented encompassing force balance, surface pressure measurement, seven-hole probe surveys, and vortex burst trajectories. The results show that the net effect of this form of nonplanarity is an increase in lift for anhedral and a decrease in lift for dihedral compared to the planar wing. Small anhedral angles aremosteffectivein augmenting lift. Anhedral doesnot appearto greatly augmentthestrength of theleading-edge vortex. The major benee t from anhedral would appear to be due to its displacing effect on the vortex trajectory: drawing the vortex closer to the wing surface and inboard compared to the planar wing. As the vortex is drawn inboard, its induced surface loading acts on a greater area of the wing. Dihedral also draws the vortex closer to the wing surface (to a greater extent then anhedral ) while moving the vortex toward the wing leading edge. In addition, anhedral doesnotappearto introduceany detrimental effectson longitudinal stability and doesnot incur any penalties in terms of vortex burst characteristics.
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