关键词: 氢气泄露；氢燃料电池公交车；环境风速；数值模拟

Abstract: Fluent software is used to study the hydrogen leakage diffusion law and distribution of hydrogen in a hydrogen fuel cell bus under environmental wind. Taking a hydrogen fuel cell bus with a hydrogen storage capacity of 26 kg and a hydrogen storage pressure of 35 MPa as an example, a numerical model of hydrogen leakage diffusion in hydrogen fuel cell buses is established. The distribution of hydrogen concentration and combustible area (Volume fraction:4% ～ 75%) is comparatively analyzed under different window opening methods, environmental wind speeds and wind directions. The results show that the hydrogen concentration decreased by 3/4 when the windows are opened at the same time in the front and rear, but there is almost no effect on the volume of the combustible region. The hydrogen volume decreases by 13 m3 in the case of lateral incoming wind, but the hydrogen forms a larger size combustible hydrogen cloud outside the vehicle. When the ambient wind speed is higher, the concentration of hydrogen inside the car is lower, and the combustible range of hydrogen formed outside the car becomes smaller.

Key words: Hydrogen leakage; Hydrogen fuel cell bus; Environmental wind speed; Numerical simulation