Effects of relative position of dual vents in the passenger cabin of fuel cell bus on leaking hydrogen dispersion

In the process of promoting hydrogen energy in the automotive field, priority should be given to addressing the safety concerns associated with its use. Ventilation is an important means to prevent the accumulation caused by hydrogen leakage in hydrogen fuel cell buses. The effects of the relative positions of two events on hydrogen dispersion in a space with multiple obstacles is studied to investigate the ventilation effect of the hydrogen fuel cell bus with seats in this paper. Two leakage scenarios, micro leakage rate of 1.4 g/s and severe leakage rate of 35.8 g/s, were set up in this study to investigate the distribution of hydrogen concentration. In these two scenarios, the primary vent is fixed at the top of the space, and the position of the secondary vent is changed. For micro leaks, the results indicate that ventilation scheme with auxiliary air vents located above the windshield can prevent the combustible area of hydrogen from continuously expanding after spreading to the top of the space and is most conducive to reducing the combustible area in the passenger cabin of the hydrogen fuel cell bus. For severe leaks with a hydrogen leakage rate of 38.5 g/s, the relative position of the dual vents has no significant effect on leaking hydrogen dispersion, and ventilation scheme in this study for the micro leakage is not sufficient to effectively reduce hydrogen concentration. The findings of this research hold significant reference value for advancing hydrogen energy within the automotive field.