Analysis of Hydrogen Leakage and Diffusion in Onboard Hydrogen Supply Systems Within Confined Spaces
To address the potential safety risks caused by hydrogen leakage from the onboard hydrogen system in confined spaces,a hydrogen leakage diffusion simulation study was carried out on a hydrogen fuel cell semi-trailer tractor in a confined space using fluent software.The results show that,using the backward hydrogen leakage data as a baseline,the hydrogen concentration near the vent increases by an average of 42.38%after upward leakage and by 99.89%after forward leakage.Taking the hydrogen concentration data at a leak rate of 10 g/s as a benchmark,the hydrogen concentration near the vent increases by an average of 4.68%at a leak rate of 20 g/s and 127.73%at a leak rate of 90 g/s.Under certain conditions,increasing the vent area can reduce the hydrogen concentration in the confined space,but it is far less effective than using forced ventilation near the vent.After a prolonged period of hydrogen leakage,the hydrogen distribution throughout the confined space gradually reaches equilibrium.Therefore,hydrogen leakage should be promptly and effectively restricted.
hydrogenleakagenumerical methodstrucksconfined space
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