The influence of surface ablation on aerodynamic characteristics of hypersonic vehicle
In view of the complex physico-chemical process of micro-ablation on the surface of carbon-carbon material affected by aerodynamic heating during high-speed flight of aircraft,the reaction products enter the boundary layer of flow field and interact with high-temperature gas,the thermochemical non-equilibrium numerical calculation of wing-body assembly and HTV-2 aircraft under typical working conditions is carried out.The effect of surface ablation of carbon-carbon materials on aerodynamic characteristics of hypersonic vehicles is analyzed.The results show that the more intense the surface ablation of carbon-carbon material,the higher the surface gas ejection velocity,the more obvious the effect of heat and drag reduction of aircraft.The surface ablation model of carbon-carbon materials mainly affects the calculation results of surface heat flow in the areas of the end head and leading edge of the wing,mainly affects the calculation results of friction in a large area of the windward side,and has little influence on the flow field in the leeward area.The surface ablation effect effectively reduces the predicted value of axial force,and has little effect on normal force and pitching moment.
hypersonic vehiclesurface ablationheat fluxC-C materialsheat and drag reducing
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