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Mechanism analysis of magnetohydrodynamic control in hypersonic turbulent flow

Based on the low magnetic Reynolds number assumption, the coupled model are established for the turbulent flow field and the externally applied magnetic field. The AUSMPW+ scheme and LUSGS method are implemented to solve turbulent MHD flow equations, within which the Spalart-Allmaras one-equation turbulence models was used. A series of numerical simulations over various geometry configurations, namely, a flat plate and a compression corner, have been conducted by application of an external electromagnetic field. Results show that, the performance of MHD boundary layer flows control is mainly determined by the Lorentz force in the streamwise direction. With an external magnetic field applied，the low velocity fluid in the boundary layer can be decelerate and increased the static temperature locally. Moreover, the counter-flow Lorentz force always brings negative effects on the turbulent skin friction coefficients, and the location for the MHD zone has a great influence on the control efficiency of the ramp-induced separation. A reasonable magnetic field layout scheme should be configured in practical engineering application.