| Citation: | LI Jiachao, LIANG Guozhu. Experiment and numerical simulation of liquid nitrogen tank atmospheric ground parking[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(1): 99-107. doi: 10.13700/j.bh.1001-5965.2017.0016(in Chinese)
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In order to study the progress of the cryogenic propellant during atmospheric ground parking, a visualization liquid nitrogen tank experiment system was designed. The experiment researched how the filling rate and ambient temperature affected the evaporation mass of liquid nitrogen, and measured the fluid inside tank and the wall temperature outside tank which changed with the time and location. The experimental results show that during atmospheric ground parking the phase transition mainly happens in the wall and gas-liquid interface, air pillow zone has temperature levels, and the air pillow temperature increases with the decrease of the distance from the exit. The liquid stays in the saturated state with almost consistent temperature, and the outer wall temperature distribution of the tank is significantly different in the axial direction and lower in liquid zone. The heat and mass transfer between liquid and gas is deduced from the Hertz-Knudsen equation based on the molecular dynamics theory. According to the temperature boundary conditions acquired from the experiment, physical process of 30 min in liquid nitrogen tank during atmospheric ground parking was simulated using mixture model. The simulation results show that the deviation of volume vaporization rate between simulation and experiment is within 5%, and the deviation of temperature simulation and experiment in the liquid zone is about 0.15 K.
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