Proton exchange membrane fuel cells performance enhancement using bipolar channel indentation
Proton exchange membrane fuel cells performance enhancement using bipolar channel indentation
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DOI：
10.1007/s12206-013-0983-0
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发表时间：
2014-01
影响因子：
1.6
通讯作者：
M. Dehsara;M. Kermani
中科院分区：
文献类型：
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作者：
M. Dehsara;M. Kermani
通过对单电池的三维计算，研究了双极通道压痕对质子交换膜燃料电池性能增强的影响。假设电池在80°C、Iatm的固定干燥条件和10%的入口相对湿度下操作。因此，唯一的影响通道床的形状上的细胞性能被认为是。考虑了三种不同床面形状的直槽，即平槽和锯齿状（包括半圆形和波浪形）槽床。据观察，通道床的形状直接影响的通道内的流场的流体力学，如速度矢量的大小和方向，压力变化沿着通道，和催化剂层内的氧气和氢气的消耗率。结果表明，在阳极和阴极侧的气体流动通道压痕增强了反应物种通过多孔层朝向催化剂层的净运输。观察到由于沟道压痕导致的电池的改善在18- 22%的范围内。
The influence of bipolar channel indentation on the performance enhancement of proton exchange membrane (PEM) fuel cells is studied using three-dimensional computation of a whole single cell. It is assumed that the cell operates under a fixed dry condition of 80°C, 1 atm, and inlets’ relative humidity of 10%. Hence the sole influence of channel-bed shapes on the cell performance was considered. Three straight channels with different bed shapes were considered, namely, flat and indented (including semicircular and wavy) channel-beds. It is observed that the channel-bed shapes directly influence the fluid mechanics of the flow field within the channels, such as the magnitude and direction of the velocity vectors, pressure variations along the channels, and the consumption rates of oxygen and hydrogen within the catalyst layer. The results reveal that gas flow channel indentations in the anode and cathode sides enhance the net transport of reacting species through the porous layers toward the catalyst layer. The improvement of the cell due to channel indentation is observed to be in the range 18–22%.