回流口位置对液体火箭液氧贮箱热分层影响规律研究

低温液体火箭射前需要采用自然循环方式对火箭发动机进行充分预冷，循环预冷管路的回流口位置是影响液氧贮箱内部场分布的重要因素。本文采用CFD技术，通过对不同回流位置的液氧贮箱物理场的数值模拟，揭示了贮箱内部温度场及速度场的分布特性，分析了回流口位置对贮箱内部热分层的影响规律。研究表明，当回流口位于下封头以上2米位置时，贮箱内部液氧过冷度最大，过冷液体含量最多，回流位置最佳。此研究结果为运载火箭推进系统的设计提供了重要的理论支持。

Study on the effect of the return flow locations on the thermal Stratification in Liquid Oxygen ta

The engine of cryogenic liquid rocket is required to precool fully by natural circulation before launching, and the return flow location of the circulation loop plays an important part in field distribution of tank. In the present investigation, a numerical study was performed for physical field of tank with different return flow locations based on CFD technique and the distributions of temperature and velocity fields were depicted, the effect of the return flow location on thermal stratification was analyzed. It is found that the return location at 2 meter above the bottom header is optimal, where the volume and depth of subcooled liquid oxygen in tank have the most values.