Numerical Investigation on Mechanisms of MHD Heat Flux Mitigation in Hypersonic Flows

Numerical simulations of hypersonic magnetohydrodynamics (MHD) flow over a typical sphere–cone blunt body are carried out based on the assumption low magnetic Reynolds number. The effects an external dipole field surface heat flux analyzed in detail, and multiple mechanisms MHD mitigation revealed systematically for first time. following is found: (1) can effectively reduce stagnation point flux, increase boundary layer thickness due to effect counter-flow Lorentz force, which equivalent adding adverse pressure gradient, main reason. (2) In head region body, relative shows complex trend rising falling because there two could produce opposite flux. One that force results thickness, other Joule heating increases static temperature behind shock wave. (3) shoulder component, normal streamline, change direction fluid elements, causing streamline deviate from wall or even separate, thus affecting (4) large area downstream still be reduced by more than 30% “upstream historical effect”.