低温贮箱在轨压增数值研究

nterface distribution in microgravity could be easily obtained based on VOF model of CFD. And ullage zone and liquid zone of hydrogen tank were computing separately with Lump-Vapor model. With the UDF considering the heat and mass transfer happened in gas-liquid interface, pressurization process of hydrogen tank could be predicted quickly. The simulation results indicted that the gas-liquid interface shape achieved stability in 7200 seconds under the cooperation of microgravity and surface tension. After 4 days in orbit, the temperature of interface increased 4.87K, and the pressurization rate was about 70.75kPa per day with the constant space heat leakage flux of 6.5W/m2. In the premise of certain precision, the Lump-Vapor model can not only better predict the tank pressure characteristics and physical distribution, but also safe more computing time, significantly improve operation efficiency.