70 MPa Ⅲ型车载储氢气瓶充氢过程的热力学响应特性模拟

大容量高压车载储氢气瓶充氢过程的热力学响应特性是氢燃料电池汽车氢气安全充注亟需解决的关键问题。采用CFD模型,对70 MPa Ⅲ型车载储氢气瓶在不同长径比、充氢速率、气瓶初始压力、气源温度条件下充氢过程的热力学响应特性进行模拟。结果表明,在高压下氢气不可视为理想气体;重力对充氢过程的影响不能忽略;容积100 L储氢气瓶的最佳长径比为3.55;气源温度对充氢过程的影响最为显著,其次是气瓶初始压力与充氢速率,与热力学分析获得的结论类似。

SIMULATION OF THERMODYNAMIC RESPONSE CHARACTERISTICS OF HYDROGEN FILLING PROCESS OF A 70 MPa TYPE Ⅲ VEHICLE-MOUNTED HYDROGEN STORAGE TANK

The thermodynamic response characteristics of the hydrogen charging process of the large-capacity and high-pressure vehicle-mounted hydrogen storage cylinder is a key issue that needs to be solved urgently for the safe hydrogen charging of hydrogen fuel cell vehicles. Using the CFD model, the thermodynamic response characteristics of the hydrogen charging process of the 70 MPa Ⅲ vehicle-mounted hydrogen storage cylinder under different length to diameter ratio, hydrogen charging rate, initial pressure of the cylinder, and precooling temperature were simulated. The results show that hydrogen cannot be regarded as an ideal gas under high pressure, and the influence of gravity on the hydrogen charging process cannot be ignored. The best length-to-diameter ratio of a 100 L hydrogen storage cylinder is 3.55; the precooling temperature has the most significant influence on the hydrogen charging process , followed by the initial pressure of the cylinder and the hydrogen charging rate, which are similar to the conclusions obtained by thermodynamic analysis.