Study on the Thermodynamic Behavior of Large Volume Liquid Hydrogen Bottle Under the Coupling of Different Motion States and Operational Parameters

To investigate the variations in the thermodynamic behavior of large-volume liquid hydrogen tanks under different influencing factors, a numerical model for liquid hydrogen tanks was developed. The changes in thermodynamic behavior in vehicle-mounted liquid hydrogen bottles under different motion states, different operational pressures, and different insulation thicknesses, and their mutual coupling scenarios were studied. The results show that the movement makes the phase state in the liquid hydrogen bottle more uniform, the pressure drop rate faster, and the temperature lower: the heating rate in the liquid hydrogen bottle at 0.85 MPa operational pressure is lower than that at 0.5 MPa and 1.2 MPa. When the operational pressure is coupled with the motion state, the influence of the motion state on the thermodynamic behavior of the fluid is dominant: the temperature near the wall rises rapidly. The temperature near the tank wall rises rapidly; however, as the thickness of the insulation layer increases, both the heating rate inside the liquid hydrogen tank and the temperature difference within the tank gradually tend to stabilize and become uniform.