Accession Number : ADP006067
Title : Numerical Optimization of Conical Flow Waveriders Including Detailed Viscous Effects,
Corporate Author : MARYLAND UNIV COLLEGE PARK DEPT OF AEROSPACE ENGINEERING
Personal Author(s) : Bowcutt, Kevin G. ; Anderson, John D., Jr. ; Capriotti, Diego
Report Date : NOV 1987
Pagination or Media Count : 23
Abstract : This is the second in a series of papers describing some new research on hypersonic waveriders. In particular, a family of optimized hypersonic waveriders is generated and studied wherein detailed viscous effects are included within the optimization process itself. This is in contrast to previous optimized waverider work, wherein purely inviscid flow is used to obtain the waverider shapes. For the present waveriders, the undersurface of the inviscid flow over a tapered cylinder (calculated by the axisymmetric method of characteristics), and the viscous effects are treated by integral solutions of the boundary layer equations. Transition from laminar to turbulent flow is included within the viscous calculations. The optimization is carried out using a nonlinear simplex method. The resulting family of viscous hypersonic waveriders yields predicted high values of lift/drag, high enough to break the L/D barrier based on experience with other hypersonic configurations. Moreover, the numerical optimization process for the viscous waveriders results in distinctly different shapes compared to previous work with inviscid-designed waveriders. Also, the fine details of the viscous solution, such as how the shear stress is distributed over the surface, and the location of transition, are crucial to the details of the resulting waverider geometry. Finally, unique to the present paper is a study of the moment coefficient variations and heat transfer distributions associated with the viscous optimized waveriders.
Descriptors : *AEROSPACEPLANES, *HYPERSONIC AIRCRAFT, INVISCID FLOW, WING BODY CONFIGURATIONS, LIFT TO DRAG RATIO, SHEAR STRESSES, BOUNDARY LAYER TRANSITION, HEAT TRANSFER, SYMPOSIA.
Subject Categories : Fluid Mechanics
Research and Experimental Aircraft
Distribution Statement : APPROVED FOR PUBLIC RELEASE