Fin dihedral effects on wing-body carryover for supersonic noncircular missiles

Abstract

The aerodynamic effects of fin dihedral, Mach number, and fuselage cross section shape on wing-body carryover are investigated for supersonic, wing-body missiles at low angles of attack. A steady, three-dimensional, Euler code was used to numerically determine the normal force and center of pressure (CP) on infinitely thin delta wings in the presence of the missile body. The wing normal force is presented in terms of the component buildup parameter Kw(B)> a measure of the wing-body interference due to body up wash. KW(B) was found to be sensitive to dihedral, Mach number, and body cross-sectional shape. Fin dihedral influenced the wing CP for the inverted-triangular and triangular fuselage cross sections, but it did not appreciably affect the CP for circular, square, and diamond cross sections. For all fuselage cross sections, increasing Mach number moved the fin CP inboard. Changing the fuselage cross section from a circle to a diamond or triangle generally moved the fin CP outboard. Nomenclature a = shape factor (Appendix) M. = aspect ratio of wing formed by joining two fins CN]V(B) = fin normal force coefficient in presence of body (CNU)W = fin-alone normal force curve slope, deg1 (CNU ) W(B) = fin normal force curve slope in presence of body, deg-1 KW(B) = fin-body interference factor due to upwash KQ = fin-fin interference factor due to sideslip