Abstract: A theoretical model is used to predict the hydrogen-air buoyancy jet generated by the slow leakage of hydrogen in two connected chambers with natural ventilation. The results show that when hydrogen leaks from one of the two connecting chambers, the relative position of the connecting port and the vent outside the leakage area has a greater impact on the hydrogen distribution. Increasing the distance between the central communication opening and the vents outside the leakage area, as well as increasing the vent area, can reduce density in the space and increase the location of high concentrations. The layering height and the change in leakage source height are positively correlated. The dispersion mechanism of hydrogen in naturally ventilated connected spaces is predicted in this study. From the perspective of hydrogen risk control, the locations where high concentrations occur are determined, and theoretical support for the safe operation of hydrogen storage equipment is better provided.

Key words: hydrogen leakage, connected chambers, buoyant plumes, leakage height, opening