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建立了液体火箭发动机的液氧贮箱与底部预冷回路的数值计算耦合模型,模拟了地面停放过程中贮箱与底部预冷回路的三维非稳态两相流动与传热过程,分析了自然循环预冷条件下液氧贮箱和底部预冷回路中的三维物理场分布及随时间变化规律。结果表明:随着停放时间的增加,液氧的蒸发量增加,停放中后期贮箱内的热传递基本趋于稳定。回流管内的气化导致回流口处的温度一直呈现波动。
A numerical coupling model of liquid oxygen tank and bottom pre-cooling circuit of liquid rocket motor was established. The three-dimensional unsteady flow and heat transfer process between tank and bottom pre-cooling circuit during ground parking were simulated. Three-dimensional physical field distribution and its variation with time in liquid oxygen storage tank and bottom pre-cooling circuit under pre-cooling condition. The results show that the evaporation of liquid oxygen increases with the increase of parking time, and the heat transfer in the middle and late stages of parking has basically stabilized. Gasification in the return pipe causes the temperature at the return port to fluctuate constantly.