In order to study the influence of leakage rate and ambient wind speed on the leakage and diffusion of hydrogen in the hydrogen fueling station,the small-scale wind tunnel experiment and numerical simulation were conducted by replacing hydrogen with helium,and the influence of leakage rate and ambient wind speed on the leakage and diffusion characteristics of hydrogen was revealed.The results show that the downwind obstacle will cause the wind speed near it to decrease,while the diffusion distance of the leaked gas will increase.In the horizontal direction perpendicular to the wind direction,the diffusion width of hydrogen is less affected by the leakage rate and wind speed,but the gas diffusion distance in the height and wind di-rections is roughly proportional to the root mean square of the ratio of leakage rate to wind speed.The volume of the combusti-ble region is roughly proportional to the leakage rate and inversely proportional to the wind speed.Moreover,the calculation formulas for the hydrogen diffusion distance and combustible region volume of the full-size hydrogen fueling station are ob-tained by the similarity principle,and the calculated values are in accordance with the results of full-size simulation.The re-search results can provide a certain reference for the prevention of hydrogen fueling station accidents.
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