质子交换膜燃料电池平行流场优化

Optimization of Straight-Parallel Flow Field for Proton Exchange Membrane Fuel Cells

质子交换膜燃料电池平行流场因其较小的压降和较多分支流道会使整个流场中的反应气体流动很不均匀,产生了较差的流动特性,也会使电池的电化学反应不够充分进而严重影响电池的输出功率,所以需要对平行流场的几何结构进行优化,从而得到较好的流动特性。文章采用一种基于动量和质量守恒的数值解析法对电池流场结构进行数值优化,并且优化结果用三维计算流体动力学进行模拟并证明优化是有效的,优化后的流场能够最终消除流场的流动不均匀性并得到流动均匀的流场,使得电池的整体性能得以提高。

Straight-parallel flow field of proton exchange membrane fuel cells （PEMFC） causes the poor flow because of its lowest pressure drop and branch channel between the traditional gas-distributor plane. It gives rise to the problem of severe flow distribution in the flow field. As a consequence, the mass transfer and electrochemistry reaction for the PEMFCs flow field in insufficient process significantly influences the output power of fuel cells, and it is necessary to optimize the geometric construction of parallel flow field to obtain a better flow distribution. So an analytical method based on mass and momentum conservation was proposed to numerical optimization for the flow field of fuel cells. And the results released from this solution were validated by computing from the three-dimensional computational fluid dynamics simulations, CFD. The optimized results can eliminate the misdistribution, and an even flow distribution can be achieved. And a higher whole performance is improved.