Study on the combination influences of homotype rough element on hypersonic blunt cone flow

Abstract

Abstract To study the influence of the homotype rough element combination and spacing on the flow around the hypersonic blunt cone, the high-order accuracy finite difference method is used to directly simulate the flow field around the hypersonic compressible blunt cone, and the influence of the homotype of rough element on the boundary layer parameters such as heat flux and friction coefficient is discussed. It is concluded that two K-type rough elements lead to the formation of three compression waves and two expansion waves in the flow field. On the contrary, two D-type rough elements form two compression waves and three expansion waves in the flow field, and a long flow separation will be formed between two K-type and D-type rough elements. When the spacing of rough elements is 1, the drag reduction and heat reduction effect of K+K rough element is better than that of D+D rough element. When the spacing between the two rough elements is greater than a certain length, the two rough elements will not affect each other.