关键词: 激波边界层相互作用;MHD流动控制;小磁雷诺数;边界层分离

Abstract: In order to study the effects of MHD accelerating boundary layer on Shock Wave–Boundary Layer Interactions (SWBLI),high order finite difference method (FDM) was used to solve the low magnetic Reynolds numbers MHD turbulent flow.In the CFD code,the inviscid and viscous flux vectors were discreted with WENN scheme and Roe-averaged central difference scheme respectively,and the explicit-implicit method was used to solve the MHD equations.The dependence of separation parameters to the turbulence,electrical field intensity,magnetic intensity and electrical conductivity of ionized air were discussed.The numerical results show that,with the same inverse pressure gradient,the time to establish steady flow for separated turbulent is shorter than that of laminar flow.The separation bubble size is smaller than that of laminar flow.With Lorenz force accelerated,the turbulent boundary layer profiles turns full,displacement thickness decreases,and the separation/reattach point moves toward the point where the incident shock impinges on the flat plate,and thus the separation bubble size is diminished or even eliminated.

Key words: SWBLI;MHD flow control;Low magnetic Reynolds number;Boundary layer separation