NUMERICAL STUDY ON HYDROGEN LEAKAGE DIFFUSION IN CHASSIS REGION OF FUEL CELL VEHICLES

Zhang Yifan; Ye Fang; Guo Hang; Chen Hao; Zhang Weibo

doi:10.19912/j.0254-0096.tynxb.2024-1748

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 748-753. DOI: 10.19912/j.0254-0096.tynxb.2024-1748

NUMERICAL STUDY ON HYDROGEN LEAKAGE DIFFUSION IN CHASSIS REGION OF FUEL CELL VEHICLES

Zhang Yifan¹, Ye Fang¹, Guo Hang¹, Chen Hao¹, Zhang Weibo²

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Abstract

Using computational fluid dynamics （CFD） tools, combined with the Toyota Mirai model, a representative product of hydrogen fuel cell vehicles, the leakage and diffusion of hydrogen in the chassis area and cab were numerically simulated by changing the operating conditions and environmental conditions, and the effects of leakage location, ambient temperature and ventilation conditions on hydrogen leakage and diffusion were studied. The results show that the diffusion of hydrogen is relatively stable when there are fewer obstacles, and hydrogen will accumulate when there are more obstacles. The increase of ambient temperature will intensify the movement of gas molecules, so that the diffusion range of hydrogen in the same time is larger, but the influence of ambient temperature on hydrogen leakage and diffusion is small. Enhanced ventilation promotes the fusion of hydrogen with air. With the increase of the number of vents, the hydrogen diffusion effect is more significant. After adding ventilation conditions, the volume fraction of hydrogen inside the vehicle reaches the lower limit of flammable concentration in a shorter time.

Key words

hydrogen / leakage / diffusion / numerical simulation / hydrogen fuel cell vehicles

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Zhang Yifan, Ye Fang, Guo Hang, Chen Hao, Zhang Weibo. NUMERICAL STUDY ON HYDROGEN LEAKAGE DIFFUSION IN CHASSIS REGION OF FUEL CELL VEHICLES[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 748-753 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1748

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