| Citation: | SUN Qiang, MA Yuan, GAO Yan, et al. Comparative investigation and experimental verification on depth subcooling schemes of cryogenic liquid oxygen[J]. Journal of Aerospace Power, 2023, 38(12):2905-2911 doi: 10.13224/j.cnki.jasp.20210382 |
The advantages of using subcooled liquid oxygen were illustrated in terms of density, apparent cooling capacity and pressurization pressure of the tank. For the purpose of acquiring 66 K subcooled liquid oxygen, three subcooling schemes, including: liquid oxygen evacuation, negative pressure liquid nitrogen bath and helium refrigeration cycle, were quantitatively and qualitatively compared from the perspectives of cryogenic mass consumption, work consumption, system process complexity and system security. The single-stage and two-stage subcooling schemes were further compared for the liquid nitrogen bath subcooling technology, and the two-stage liquid nitrogen bath subcooling scheme was finally recommended to acquire 66 K depth subcooled liquid oxygen. A semi-industrial experimental system of subcooled liquid oxygen acquisition was established based on the two-stage subcooling scheme, and liquid nitrogen was successfully subcooled to below 66 K. The experimental results showed that within the flowrate range of 0−3 L/s, the temperature of liquid oxygen in the process of subcooling filling decreased with the increase of flowrate due to the pipeline heat leakage. The feasibility of the two-stage liquid nitrogen bath subcooling scheme was verified by this experiment. This research could provide a theoretical and technical reference for the upgrading of propellant filling systems at launch sites for cryogenic rockets.
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