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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.采用计算流体力学(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 m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.
The rocket engine needs to be precooled sufficiently by natural circulation before the low-temperature liquid rocket launching, and the location of the return port of the circulating pre-cooling pipeline is an important factor that affects the internal field distribution of the liquid oxygen storage tank. Computational fluid dynamics (CFD) The numerical simulation of the physical field of liquid oxygen storage tank at different backflow locations revealed the distribution characteristics of the temperature field and velocity field inside the storage tank and analyzed the influence of the position of the return port on the thermal stratification inside the storage tank. When the mouth is located at 2 m above the lower header, the maximum degree of subcooling of liquid oxygen and oxygen in the tank is the largest, the content of supercooled liquid is the most, and the position of reflux is the best.The results of this study provide important theoretical support for the design of launch vehicle propulsion system.