PEMFC冷却流道数值模拟及实验研究

Numerical simulation and experimental analysis of novel type PEMFC coolant channel

温度是影响质子交换膜燃料电池(PEMFC)工作性能的主要因素之一,为了使燃料电池的温度更加均匀并提升电堆综合效率,设计了一种新型冷却流道,通过CFD模拟与传统的平行流道和蛇形流道进行对比,采用表面最大温差、温度均匀指数和冷却液压降评估冷却流道性能。基于新型冷却板,装配1 kW电堆进行膜电极单体电压稳定性实验。结果表明:新型冷却板可以在降低冷却液循环耗能的基础上,保证电堆膜电极的电压均衡性,平均电压波动在±0.003762 V,进而可进一步提升电堆综合发电性能。

Temperature is one of the main factors affecting the performance of PEMFC.In order to make the temperature of fuel cell more uniform and effectively improve the comprehensive efficiency of the stack,a new cooling channel was designed.It is compared with the traditional parallel channel and serpentine channel through CFD simulation.The cooling performance of cooling channels is evaluated by surface maximum temperature difference,temperature uniformity index and cooling hydraulic pressure drop.Based on the novel coolant plate,a 1 kW stack was assembled to test the voltage stability of membrane electrode monomer.The results show that the novel coolant plate ensures the voltage balance of the membrane electrode of the stack on the basis of reducing the energy consumption of coolant circulation,the average voltage fluctuation is±0.003762 V.It can further improve the com-prehensive power generation performance of the stack.