Analyse the dynamic change of pressure and temperature in the working tank of the self-pressurizing system of liquefied natural gas (LNG) vehicle

using the simulation software SindaFluint to model and calculate the classical self-pressurization process based on lumped parameter method. The variation of pressure and temperature in the tank at different speeds and ambient temperatures is studied. The results show that the pressure fluctuation frequency in the tank changes from fast to slow in the process of self-pressurization

and the pressure becomes more and more stable with the continuation of the pressurization process. The temperature of the gas phase fluctuates synchronously with the pressure

while the main temperature of the liquid phase remains basically unchanged at 112.5 K. The higher the speed

the greater the frequency of pressure fluctuation in the tank. However

the environmental heat leakage has little effect on the self-charging system.