NUMERICAL SIMULATION OF HYDROGEN REFUELING STATIONS LEAKAGE AND DIFFUSION FROM HYDROGEN UNDER VARIOUS EXTERNAL ENVIRONMENTS

Fang Yunhui; Yu Haohua; Zeng Delong; Chen Yu; Ma Jun

doi:10.19912/j.0254-0096.tynxb.2024-0034

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (10) : 128-137. DOI: 10.19912/j.0254-0096.tynxb.2024-0034

NUMERICAL SIMULATION OF HYDROGEN REFUELING STATIONS LEAKAGE AND DIFFUSION FROM HYDROGEN UNDER VARIOUS EXTERNAL ENVIRONMENTS

Fang Yunhui¹, Yu Haohua², Zeng Delong³, Chen Yu¹, Ma Jun³

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Abstract

In order to explore the hydrogen diffusion law after hydrogen refueling station leakage and formulate corresponding protective measures, taking a planned hydrogen refueling station in Ningbo city as the research object, the CFD simulation software Ansys Fluent was used to simulate the hydrogen leakage diffusion under various external environmental conditions. Results indicate that wind has a significant impact on the leakage and diffusion of hydrogen: higher wind speeds correspond to smaller volume of hydrogen cloud formed and faster attainment of steady state. Structural elements such as buildings and equipment can redirect wind and reduce its speed to some extent. In such cases, the volume of formed hydrogen cloud is slightly larger but still smaller than under windless conditions. Hydrogen tends to accumulate at areas such as the junction of the station and the roof, as well as above the hydrogen dispenser. Placement of hydrogen sensors near these locations enables effective leak detection, reducing potential risks at hydrogen refueling station. Based on the constructed model, a layout scheme for hydrogen sensors is proposed, ensuring successful alarms in all studied scenarios. When wind direction is perpendicular to the direction of the leak, the volume of hydrogen cloud formed is small and detection may be relatively challenging, potentially leading to delayed alarms. Hence, it is suggested to increase personnel patrols or deploy additional mobile alarm devices in these areas.

Key words

hydrogen fuel / leakage / wind effect / leak detection / numerical simulation / concentration distribution

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Fang Yunhui, Yu Haohua, Zeng Delong, Chen Yu, Ma Jun. NUMERICAL SIMULATION OF HYDROGEN REFUELING STATIONS LEAKAGE AND DIFFUSION FROM HYDROGEN UNDER VARIOUS EXTERNAL ENVIRONMENTS[J]. Acta Energiae Solaris Sinica. 2025, 46(10): 128-137 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0034

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