Aerodynamic Characteristcs Of Hypersonic Vehicles By Applying Magnetohydrodynamic Flow Control

Due to intense aerodynamic heating,a bit of air will ionize,which is beneficial for magnetic field to control flow field contactlessly.By using Maxwell to construct complex magnetic fields,and using??????to realize MHD(Magnetohydrodynamics)equation's calculation,the aerodynamic-force characters under different magnetic fields were analyzed.In order to research the MHD aerodynamic effect and MHD shock control,some specific constructions were built to simulate MHD flow.The basic theories of hydromechanics and electromagnetics were introduced.On the basis of finite element modeling of Maxwell,the computing method of static magnetic fields and adaptive grids were introduced.The numerical solution of ?????? on MHD was described in detail,meanwhile the integral disperse form of FVM was given.In allusion to axial symmetry bulb model,on the basis of low magnetic Reynolds MHD equation,the MHD mechanism of three basic uniform magnetic fields was analyzed.The saturation effect of magnetic field was found,and the radial magnetic field is more effective to control the flow field.Then under the dipole magnetic field and the solenoid field,the difference of flow will be compared and the coupling mechanism of basic magnetic fields will be discussed.For 2D semicircle,by changing magnetic dip angle,the aircraft will catch a pitching moment with the overlap effect of Lorentz force and aerodynamic force.Because of the positive feedback mechanism among shock strength,temperature and Lorentz force,the Raizer's conductive model will lead to larger asymmetry under the incline magnetic field.The possibility of MHD drag increase on a wedge model will be analyzed in theory.Considering the lower compressed strength of oblique shock,the electric conductivity behind the shock is too low to realize an effective MHD function.So seed particles and e-beam ionization methods will be introduced to strengthen the conductivity and the life-drag ratio of the wedge will be calculated.With the same ionization method,the flow of MHD inlet will be simulated.Then the MHD effect of uniform magnetic fields for inlet will be researched under different working conditions.Especially,the SOL condition and the performance parameter changing will be analyzed.