Simulation Study on Thermal Stratification inside Cryogenic Tank under High Heat Flux Condition of Vehicle Launching
To reveal the temperature field distributions of the bare-wall cryogenic propellant tank during vehicle launch-ing,a coupling simulation model,including fluid region and solid wall region,was established to realize the continuous pre-diction of ground pre-pressurization,launching aerodynamic heating and pressurized discharge processes.The thermal strati-fication and pressurization performance inside a bare-wall tank and a foamed wall tank were compared.The simulation re-sults show that the pressurization effect in the pre-pressurization stage was closely related to the thermodynamic state in the ullage region of the tank.Aerodynamic heating in the lift-off process of the bare-wall tank could produce strong natural con-vection and thermal stratification,which further affected the temperature quality of liquid oxygen.The maximum tempera-ture of liquid oxygen in the tank might exceed 93 K.The effect of aerothermal heating on the temperature of cryogenic pro-pellant in the tank could be significantly reduced by using a foam insulation layer.Generally,the present research could pro-vide guidance for the design of thermal insulation scheme for rocket cryogenic tank in the future.
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