Accession Number : AD0483805

Title :   OPTIMUM LIFTING BODIES IN HYPERSONIC VISCOUS FLOW.

Descriptive Note : Rept. for Nov 65-Feb 66,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS

Personal Author(s) : Lewellen, William S. ; Mirels, Harold

Report Date : APR 1966

Pagination or Media Count : 13

Abstract : The problem of minimizing the drag and maximizing the lift-to-drag ratio of power-law half-bodies in hypersonic viscous flow is considered. Emphasis is placed on obtaining optimum L/D for different prescribed conditions. Both two-dimensional and axisymmetric half-bodies, at zero angle of attack are treated. It is assumed that the body is slender, the shock is strong, and the ratio of specific heats is close to unity. In the two-dimensional case, the effect of removing the restriction to power-law shapes is examined. The result is a viscous generalization of the 'Newtonian chine strip.' For each of the lift cases treated, the maximum L/D is never increased very much over the corresponding value obtained for a straight surface. For a given value of freestream Mach number and Reynolds number, the absolute maximum L/D obtained from a viscous chine strip is only 6.5% greater than that obtained from a flat plate. (Author)

Descriptors :   (*REENTRY VEHICLES, HYPERSONIC FLOW), (*BOOST GLIDE VEHICLES, LIFT), AERODYNAMIC CONFIGURATIONS, AERODYNAMIC CHARACTERISTICS, ANGLE OF ATTACK, SKIN FRICTION, PRESSURE, DRAG, SHEAR STRESSES, OPTIMIZATION.

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE