Reseach on Coupling Simulation of High-temperature Thermochemical Nonequilibrium Flowfield and Thermal Radiation for Reentry Vehicle at Extremely High Speed
Accurate prediction of aerothermal environment of reentry vehicles is of vital importance for deep space exploration and return missions.In this paper,a non-gray gas multi-step model is employed to calculate the radiation absorption coefficient of high-temperature atmosphere,and the discrete coordinate method is used to solve the radiation transfer equation,and combined with the self-developed hypersonic thermochemical non-equilibrium flow field solver,the coupled and non-coupled simulation studies of the flow field and radiation are carried out respectively for the FIRE II flight test examples.The predicted surface heat flow of FIRE II in this paper is consistent with the results of LAURA and DPLR,which verifies the reliability of the numerical method in this paper.The results show that the flow field and thermal radiation field have a significant coupling effect under the example condition.On the one hand,the absorption and emission of radiation energy in the shock layer make the flow field non-adiabatic,resulting in a radiative cooling effect,which reduces the temperature,increases the density and makes the shock layer thinner.On the other hand,radiation coupling affects the chemical reaction process of atmospheric components,and the composition of air components and their thermodynamic states directly affect the level of radiation.The difference between uncoupled and coupled simulations is small,but the coupling value of radiant heat flow is about 15%lower than that of uncoupled.The effect of radiation coupling cannot be ignored.The research in this paper can provide good method support and theoretical reference for aero-thermal environment prediction and thermal protection design of very high speed reentry vehicle.
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