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 3D CFD model of the liquid oxygen tank with a natural recirculation cooling loop was established.The unsteady two-phase flow and heat transfer in the tank and bottom loop was numerically investigated.The mass fraction,pressure and temperature fields in the tank were analyzed under different natural recirculation cooling conditions.Results showed that the evaporation of liquid oxygen increased with the test time.The heat transfer process became steady at the end of test time.The fluid temperature at the loop exit fluctuated due to the evaporation in the bottom loop.
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