Effect of Multi-rough Element Combination on Hypersonic Boundary Layer

Abstract

In this paper, the influence of multi-rough element combination controlled by cubic polynomial on the flow field of hypersonic blunt wedge is studied by direct numerical simulation. The influence mechanism of six continuous rough element combinations on the flow parameters in the boundary layer is analyzed in depth, and compared with the influence of double rough elements. It is concluded that the first rough element of the continuous rough element combination has a great influence on the flow field pressure, and the influence of the latter rough element decreases in turn. The combination of six continuous rough elements on the wall can better suppress the incoming flow heating and reduce the wall friction compared with the double rough elements. Compared with smooth wall, wall friction and incoming flow heating are reduced by 25.23 % and 2.69 %, respectively.