Research on Fast Filling Strategy of Large Capacity On-Board Hydrogen Storage Tank for Highway Passenger Cars

In order to study the fast filling problem of large-capacity on-board hydrogen storage tank for highway passenger cars, a computational fluid dynamics (CFD) simulation model of 134L large-capacity hydrogen storage tank was established. By simulating different pre-cooling temperatures and mass flow rates, the temperature distribution and thermal transmission in the tank were observed. Due to the large ratio of length to diameter of the hydrogen tank, the temperature distribution is extremely uneven during the whole filling process, and the high temperature area is mainly concentrated in the tank tail. And the heat transfer between the gas and the tank wall is not obvious under the low and constant mass flow rate. The temperature rise process during the whole filling process under different mass flow conditions was simulated to satisfy the highest safe temperature limit. A time-delayed filling strategy based on the control of mass flow rate and a suitable multi-stage filling strategy based on the hydrogen supply status of the actual hydrogen refueling station are respectively proposed. That will be helpful to provide the theoretical basis and technical support for fast filling in the hydrogen refueling stations.