Shaking Characteristics and Leakage Diffusion Mechanism of Vehicle Mounted Liquid Hydrogen Storage Tanks

Abstract In order to improve the safety of vehicle-mounted liquid hydrogen storage and transportation and reveal the leakage and diffusion characteristics of vehicle-mounted liquid hydrogen in open space, a numerical simulation model of liquid hydrogen leakage and diffusion was established. The leakage and diffusion behavior of liquid hydrogen during transportation was studied. The influence of wind speed, leakage rate, leakage time, wind temperature, ground temperature, and other factors on the diffusion behavior of hydrogen clouds was analyzed. The results show that the flammable hydrogen cloud formed after the leakage of liquid hydrogen diffuses from the near ground to the distant air, and the volume expands rapidly, resulting in a significant increase in the potential hazard area. The combustible hydrogen cloud has typical radial concentration gradient distribution characteristics, and the hydrogen concentration decreases from the center to the periphery. The spatial diffusion range and volume change are mainly affected by wind speed, leakage rate, and leakage duration, while the influence of wind temperature and ground temperature is relatively limited.