Influence of surface deformation of inflatable deceleration structure on thermochemical non-equilibrium flow
Under the pressure of hypersonic inflow,the surface of the inflatable deceleration structure will deform on the windward side,thereby changing the flow field.To analyze the influence of surface deformation on the flow,simu-lations are conducted for the flow past the inflatable deceleration structure before and after surface deformation based on the thermochemical non-equilibrium reaction model.The shape of inflatable deceleration structure is a blunt nosed cone with a radius of 2.4 m and a half cone angle of 60°,consisting of a rigid head face and 6 inflatable rings.The nu-merical model adopts a 5-component dual-temperature thermochemical reaction model,and the wall catalytic condi-tions include non-catalytic and fully catalytic wall.The influence of surface deformation on flow characteristics,heat flux,and pressure under different attack angles is investigated.The results show that surface deformation can lead to periodic temperature and pressure fluctuations in the shock layer of the inflatable deceleration structure,as well as non-uniform distribution of dissociated components.The influence of surface deformation on flow variables weakens as the attack angle increases.After surface deformation,the change in velocity leads to increase in the heat flux and de-crease in the pressure at inflatable rings,as well as decrease in the heat flux and increase in the pressure at the con-cavities between inflatable rings.The effect of surface deformation on the pressure is weaker than that on the heat flux.There is no significant change in the aerodynamic coefficients of the front face of the inflatable deceleration struc-ture after deformation.
inflatable decelerationhypersonic flowaerothermodynamicsnon-equilibrium reactiondual-temperature model
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