Design, Optimization And Numerical Simulation Of Cone-derived Waverider

The waverider configuration is considered as the ideal aerodynamic configuration for hypersonic flight vehicle. Isentropic expansion design has been done to the upper surface, and better performance such as higher lift to drag ratio is obtained. This is the first study to develop waverider with expansion angle used as one of the basic design parameters.A series of 60 meters Mach 6 waveriders flying at 30 kilometers are optimized for cruise in this paper. Cone flow field is used here as the generating flow field. The projection of the leading-edge on the base surface is defined using a forth-order function. The lower surface is produced tracing streamlines and isentropic expansion is done in some part of upper surface. Five main design parameters are as follows: shock angle, semi-spanwise angle, expansion angle, length-to-span ratio and a function coefficient.A computer code of producing waverider is written and the effect of each design parameter to waverider performance is discussed. Some useful concludes are obtained. Cruise configuration is viscous optimized for maximum lift to drag ratio. The complex method is chosen for the current work for it is proven very successful in constrained optimization. Several constraints have been added to the optimization, such as the matching of lift to weight, the height of inner room, and so on. All five parameters are optimized at the same time.Two groups of waveriders under different constraints are obtained, comparisons show that lift to drag ratio can be improved by expanding the upper surface.The on-design and off-design performances of one optimum waverider configuration produced in this paper are calculated by CFD software. Results show that this viscous optimized waverider configuration with expansion angle and matching lift to weight is a promising choice for an engine/airframe integrated design, especially for a cruise type application.