Altitude and Design Length Effects of Optimized Waverider Derived from Cone Flow

The hypersonic waverider has characteristics of higher lift over drag ratio.This paper is concerned with waverider optimized design,the object function was lift over drag ratio,viscous optimized process was completed by Nelder and Mead's method,Altitude and design length that determined the Reynolds number was discussed in the optimized process of waverider,The result is: Reynolds number is smaller,coefficients of friction drag is larger,and lift over drag ratio is smaller.