较低电场的湍流边界层分离MHD控制研究

doi:10.7527/S1000-6893.2025.32481

Abstract

Abstract: Boundary layer separation MHD control of high applied electric field and electromagnetic energy requirements is one of the difficulties in practical engineering. A coupled computational method of hypersonic turbulence and electromagnetic field considering various physical effects is established by solving the governing equations of flow with electromagnetic source term Poisson equation of electric potential integral equation of magnetic vector and turbulence equation considering electromagnetic dissipation. The local electromagnetic flow control of turbulent boundary layer separation in typical inlet under low applied electric field is systematically studied. The influence mechanism of Lorentz force and current Joule heat on separated flow is emphatically analyzed, and the MHD control law and electromagnetic energy variation characteristics under different applied magnetic field, applied electric field and gas conductivity conditions are obtained. The results show that: At low applied electric field, local MHD control can effectively suppress turbulent boundary layer separation in the inlet, and the maximum separation area can be reduced by 85% under the calculation conditions in this paper. Lorentz force dominates local MHD control, while Joule heat dissipation weakens electromagnetic control effect; The influence of turbulent pulsation electromagnetic dissipation is small and can be almost ignored. The influence characteristics of applied magnetic field, gas conductivity or applied electric field on electromagnetic energy are significantly different. On the premise of satisfying engineering constraints and MHD control effect, it is suggested to choose the scheme with relatively large external magnetic field, relatively high conductivity and relatively low external electric field.

Key words: MHD, Boundary layer separation, Turbulence, Electromagnetic dissipation, Numerical simulation

CLC Number:

V411.3/O354.7

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MHD Control of Turbulent Boundary Layer Separation with Low Electric Field

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