操作参数耦合对质子交换膜燃料电池性能影响的模拟研究

质子交换膜燃料电池(PEMFC)不受卡诺循环限制,能量转换效率高,被认为是最有潜力的绿色能源转换装置之一。为了最大程度地发挥燃料电池运行时的潜能,对操作参数控制的优化和研究变得至关重要。使用ANSYS/FLUENT建立了一个采用多平行蛇形流道的三维质子交换膜单体模型,开展不同操作压力(101.325、202.65、303.975 kPa)、进口温度(300、330 K)和散热率5、40、60 W/(m~2·K)]下的性能变化模拟计算,分析不同操作参数及各参数耦合对燃料电池性能的影响。研究结果表明:各操作参数对燃料电池电流密度和温度的变化和分布情况均有显著影响;燃料电池性能在一定程度上随着散热率、操作压力及其进口温度的增加而升高,随工作电压的增加而下降;当工作电压为0.9 V时,电压对燃料电池性能的影响占据支配地位;当电压为0.5 V、散热率为60 W/(m~2·K)、操作压力为303.975 kPa时,电流密度最大,达到0.81 A/m~2。

Simulation study on the effect of operating parameter coupling on PEMFC performance

Proton exchange membrane fuel cells (PEMFCs) are not subject to the Carnot cycle, and it, high energy conversion efficiency, are considered to be one of the most promising green energy conversion devices. It is more than important to optimize and study the operating parameter control in order that the operating potential of fuel cell is maximized. In this paper, a three-dimensional monomer model of proton exchange membrane using multiple parallel serpentine channels is established by ANSYS/FLUENT. Simulation and calculates performance changes at different operating pressure (101.325 kPa, 202.65 kPa, 303.975 kPa), the inlet temperature (300 K and 330 K), and the heat transfer rate (5 W/m2-K, 40 W/m2-Kand 60 W/m2-K), and analyze the performance of the change under different coupling of operating parameters and the effects of parameters on the fuel cell performance. The results show that each operating parameter has a significant impact on the change and distribution of current density and temperature in the fuel cell; the performance of fuel cell increases to some extent with the increase of heat transfer rate, operating pressure and inlet temperature, and decreases with the increase of working voltage; when the operating voltage is 0.9 V, the influence of voltage on the performance of the fuel cell dominates; when the voltage is 0.5 V, the heat transfer rate is 60 W/m2-K, and the operating pressure is 303.975 kPa, the current density reaches 0.81 A/m2, which is the maximum value.