Optimizationof viscous Waveriders Derived from Axisymmetric Power-Law Blunt Body Flows

A method based on a Euler code is used to study waveriders generated from the flowfield around comes or axismmetric power-law blunt bodies. In the cone case, the results are compared with those given by the Talor-Maccoll system and inviscid hypersonic small-disturbance theory. This last theory shows its limits at a Mach number of 5, for cone angles providng the best lift-to-drag ratios. In the axisymmetric power-law blunt body flows case, the optimization is led using a nonlinear simplex method to get the upper surface that enables the waverider to have the best lift-to-drag ratio, the thickness-to-length ratio being fixed. Compared with the cone-derived waverider, the proposed blunt-body-derived model allows a 20% gain in volume for near equal optimized lift-to-drag ratios.