OPTIMUM LIFTING BODIES IN HYPERSONIC VISCOUS FLOW.
Rept. for Nov 65-Feb 66,
AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
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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 LD 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 LD 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 LD obtained from a viscous chine strip is only 6.5 greater than that obtained from a flat plate. Author
- Fluid Mechanics