质子交换膜燃料电池氢循环喷射器的组分输运与相变研究

Study on multicomponent and phase transition of hydrogen recirculation ejector for proton exchange membrane fuel cell

采用计算流体力学技术,研究了质子交换膜燃料电池系统中用于阳极再循环的喷射器内组分输运、相变过程对喷射器内部流动动力学和喷射器性能的影响。建立了组分输运-相变模型,并通过仿真,将所提模型与干蒸汽模型做对比。结果表明,当电堆输出功率在40~70kW时,引入组分输运-相变模型后,喷射器内部压力、速度和温度分布受到显著影响,且模型预测精度显著提高,最大误差小于5%。

In this paper,by using computational fluid dynamics(CFD)techniques,the influence of multicomponent and phase transition on the ejector internal flow dynamics and ejector performance in proton exchange membrane fuel cell(PEMFC)system anode recirculation is comprehensively studied.The multicomponent-phase transition model of an ejector is established and compared with dry gas model through simulation.It is revealed that when the stack output power is in the range of 40kW to 70 kW,the pressure,velocity and temperature profiles inside the ejector have been significantly influenced using multicomponent-phase transition model,and the simulation accuracy is improved with a maximum deviation of less than 5%.