不同流场闭口燃料电池水管理可视化研究

Visualization of water management in dead-ended PEMFC with different flow fields

闭口质子交换膜燃料电池的水管理影响其输出性能和稳定性,流场对其水管理起到重要作用。采用可视化方法,研究了不同操作条件下,不同类型流场闭口燃料电池的水分布及输出性能。研究结果表明,闭口电池中生成的水主要分布在流场两侧区域,蛇形流场水分布面积更大。由于宽直流道当量直径大于蛇形流场和窄直流场,宽直流场闭口电池具有较好的排水性能及输出性能。当电池工作温度为80℃,电流密度为1000 mA/cm^(2)时,宽直流场的电池功率比窄直流场的电池功率提高58.5%,比蛇形流场的电池功率提高14.1%。

The water management of dead-ended proton exchange membrane fuel cells affects their output performance and stability,and the flow field plays an important role in the water management.This study adopts a visualization method to investigate the water distribution and output performance of dead-ended fuel cells with different types of flow fields.The results indicate that the water generated in dead-ended fuel cells is mainly distributed on both sides of the flow fields,and the water distribution area in the serpentine flow field is larger.Due to the equivalent diameter of a wide straight channel is larger than that of a serpentine flow field and a narrow straight flow field,the dead-ended fuel cell with a wide straight flow field has better drainage and output performance.When the working temperature of the fuel cell is 80℃and the working current density is 1000 mA/cm2,the power of the cell with a wide straight flow field is 58.5%higher than that with a narrow straight flow field,and 14.1%higher than that with a serpentine flow field.