Abstract:

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.

摘要：

研究分析液化天然气（LNG）汽车自增压系统工作段储罐内的压力和温度的动态变化，利用仿真软件SindaFluint，对经典自增压过程进行了基于集总参数法的建模与计算分析，研究不同工况以及不同环境温度下储罐内的压力和温度变化，分析结果表明，在自增压过程中，储罐内的压力波动频率由快变慢，随着增压过程的继续，压力渐趋平稳，气相温度随着压力同步波动，而液相主体温度基本保持112.5 K不变。车速越大，储罐内压力波动频率越大，而环境的漏热对自增压系统的影响甚微。