The design of flow field has a great influence on the mass transfer and performance of PEMFC (proton exchange membrane fuel cell) and lots of research works focus on this area. In this paper, 3D PEMFC models with a single straight channel are established to investigate the effect of blockages on mass transfer and performance. The influence of cross section shapes of blockages and dimensionless blockage length are discussed. Results show that cross section shapes of blockages have a great impact on the enhancement of mass transfer in PEMFC. The flow-guide part and the suppression part should occur together to enhanced the mass transfer with the flow-guide part upstream and the part suppression downstream. The ratio of the single blockage length to the channel length and the ratio of the blockage length to the spacing length also have a great impact on the enhancement of mass transfer in PEMFC. The PEMFC could obtain a superior performance as the ratio of the blockage length to the spacing length and the ratio of the total block length to the channel length are 0.5 and 30%, respectively.

流场的设计对PEMFC（质子交换膜燃料电池）的传质和性能有很大的影响，对此领域有很多研究工作。在本文中，建立了具有单个直通道的3D PEMFC模型，以研究堵塞对传质和性能的影响。讨论了堵塞物的横截面形状和无因次堵塞长度的影响。结果表明，堵塞物的截面形状对PEMFC传质的增强有很大影响。导流部分和抑制部分应一起出现，以通过上游的导流部分和下游的抑制部分来增强传质。单个阻塞长度与通道长度的比以及阻塞长度与间隔长度的比对PEMFC中传质的增强也有很大的影响。当阻塞长度与间隔长度之比和总块长度与通道长度之比分别为0.5％和30％时，PEMFC可以获得更好的性能。