Efficiency analysis of depressurization process and pressure control strategies for liquid hydrogen storage system in microgravity |
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| Affiliation: | 1. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an 710049, China;2. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, China;1. NASA Marshall Space Flight Center, Huntsville, AL 35812, USA;2. NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, USA;1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai, 200240, China;2. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing, 100028, China;3. Shanghai Institute of Aerospace System Engineering, Shanghai, 201108, China;1. Institute of Refrigerating and Cryogenic Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;2. State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing, 100028, China |
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| Abstract: | In order to investigate dynamic characteristics of pressure fluctuation and thermal efficiency of a liquid hydrogen (LH2) storage system during depressurization process under microgravity condition, a transient CFD model of LH2 tank is established. Based on the assumption of lumped vapor, a UDF code is developed to solve phase change and heat transfer between liquid phase and vapor one. The thermal efficiency is provided for assessing the performance of different pressure control methods. Results show that raising the injection velocity and decreasing the temperature of the injection liquid can enhance the effect of fluid mixing and shorten the depressurization time. Increasing the pressure lower limit can also improve the efficiency of depressurization process. The model can predict the tendency of pressure changes in the tank, and provide theoretical guide to design LH2 tank and optimize its parameters for space application. |
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| Keywords: | Liquid hydrogen Thermal efficiency Pressure control Microgravity |
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