Mechanism analysis of thermochemical nonequilibrium flow field for re-entry vehicle with magnetohydrodynamic control technology
Based on theoretical research,a coupled calculation method is established for the thermochemical nonequilibrium flow field,external magnetic field,and Hall electric field.Subsequently,the effect of controlling the high-temperature thermochemical nonequilibrium flow field of a typical re-entry vehicle is numerically analyzed under different conditions of applied magnetic fields.The results show that,unlike perfect gases,considering the effect of high-temperature gas,the chemical reaction absorbs heat and decreases the flow-field temperature,reducing the efficiency of the hypersonic magnetohydrodynamic(MHD)thermal protection system.In the high-enthalpy thermally ionized MHD flow field,the counterflow Lorentz force in the stagnation-point region decelerates the fluid,while the normal Lorentz force in the shoulder region alters the structure of the local flow field,deflecting shock waves.The influence of the Hall effect on the flow field could be negligible when using insulation walls.Under such conditions,the stagnation-point and shoulder heat flux in typical states are reduced by 26.5％and 52.7％,respectively,and the control effect of the heat flux is better than using conductive walls.
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