较低电场湍流边界层分离磁流体力学控制OA

Boundary layer separation Magnetohydrodynamics(MHD)control of high applied electric field and electro-magnetic energy requirements is one of the difficulties in practical engineering.A coupled computational method of hy-personic turbulence and electromagnetic field considering various physical effects is established by solving the govern-ing 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 con-trol 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 around 85%.Lorentz force dominates local MHD control,while Joule heat dissipation weakens electro-magnetic control effect.The influence of turbulent pulsation electromagnetic dissipation is small and can be almost ig-nored.The influence characteristics of applied magnetic field,gas conductivity or applied electric field on electromag-netic 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 rela-tively low external electric field.