Efficiency analysis of depressurization process and pressure control strategies for liquid hydrogen storage system in microgravity
| Autor: | J.J. Shuang, Ya-Peng Liu |
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| Rok vydání: | 2019 |
| Předmět: |
Thermal efficiency
Materials science Renewable Energy Sustainability and the Environment business.industry Pressure control Nuclear engineering Mixing (process engineering) Energy Engineering and Power Technology 02 engineering and technology Computational fluid dynamics 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Fuel Technology Cabin pressurization Heat transfer Transient (oscillation) 0210 nano-technology business Liquid hydrogen |
| Zdroj: | International Journal of Hydrogen Energy. 44:15949-15961 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2018.11.213 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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