Abstract: Taking a vehicle carbon fiber fully-wound hydrogen storage cylinder as the research object, based on the ANSYS workbench platform, the difference of the cylinder structure layer and the uneven distribution of temperature load are fully considered, and the fluid-thermal-solid coupling numerical simulation and analysis are carried out. The specific method is to firstly carry out 3D numerical simulation of the gas flow field inside the cylinder during the fast filling process to study the law of temperature rise, then load the flow field calculation results into the cylinder structural layer for steady-state thermal analysis, and finally load both the flow field and thermal analysis results into the cylinder structural layer for structural static analysis. The results show that the maximum temperature of the cylinder and the maximum stress on the carbon fiber composite layer appear at the connection between the end head and the cylinder when the filling is finished. The thermal stress caused by the temperature load is small compared with the mechanical stress caused by the internal pressure. The difference between the mechanical stress and the coupling stress is not large, and the mechanical stress on the carbon fiber composite layer is slightly smaller than the coupling stress, while the thermal stress caused by the temperature load on the aluminum alloy liner layer is partly offset by the mechanical stress due to the large expansion coefficient, making the coupling stress smaller than the mechanical stress.

Key words: carbon fiber fully wound hydrogen storage cylinder, temperature rise during fast filling, fluid-thermal-solid coupling