IERTING CHARACTERISTICS ANALYSIS DURING GAS INJECTION STAGE IN HIGH-PRESSURE HYDROGEN FUEL CYLINDERS

Tuo Zhonglan; Xue Dawen; Xia Haishan; Pan Yun; Wang Xueren

doi:10.19912/j.0254-0096.tynxb.2024-0465

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 550-558. DOI: 10.19912/j.0254-0096.tynxb.2024-0465

Special Topics of Academic Papers at the 85th Annual Meeting of the China Association for Science and Technology

IERTING CHARACTERISTICS ANALYSIS DURING GAS INJECTION STAGE IN HIGH-PRESSURE HYDROGEN FUEL CYLINDERS

Tuo Zhonglan, Xue Dawen, Xia Haishan, Pan Yun, Wang Xueren

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Abstract

This study investigates the coupling mechanisms between the inerting flow field structure and gas mixing characteristics during the gas injection stage in high-pressure hydrogen fuel cylinders. Numerical simulations are conducted to evaluate the variations of oxygen volume fraction throughout the inerting process. Results show that the maximum oxygen volume fraction exhibits a two-stage decreasing trend, characterized by a rapid decline in the first stage and a slower reduction in the second. To elucidate the cause of this behavior, the coupling mechanisms among the velocity, pressure, and oxygen volume fraction fields are examined. The findings indicate that decreasing inlet velocity, along with increased pressure and density, reduces inerting efficiency and weakens convective mass transfer, resulting in the observed two-stage reduction. Furthermore, a non-uniform distribution of oxygen volume fraction is found to promote the rapid decrease, with the maximum value dropping at a rate 8.32 to 14.40 times faster in the first stage than in the second.

Key words

high-pressure hydrogen cylinder / numerical simulation / inerting / oxygen volume fraction / mass transfer

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Tuo Zhonglan, Xue Dawen, Xia Haishan, Pan Yun, Wang Xueren. IERTING CHARACTERISTICS ANALYSIS DURING GAS INJECTION STAGE IN HIGH-PRESSURE HYDROGEN FUEL CYLINDERS[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 550-558 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0465

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