物质输运定量反馈实现PEMFC阴极流道非均匀设计

Non-uniform design of flow channels is one of the most important ways to improve the uneven distribution of physical fields inside proton exchange membrane fuel cells (PEMFCs). Existing design ideas mainly rely on a qualitative understanding of PEMFC to determine the design direction and further optimizing of parameters in this design direction. Feedback from the obtained results is not used to correct the design ideas. Therefore, a result feedback and then optimization design approach was proposed. In this approach, the structural parameters of PEMFC were first analyzed, and then the species transport processes in the calculation results were quantitatively analyzed to determine the structural design direction. Using the proposed approach, non-uniform designs were carried out for the channel width of single-channel PEMFC and the sub-channel height of single cell. Results show that compared to the base case, the net power density of PEMFC with non-uniform designs is increased by 4%-6% , and the uniformity of physical field distribution inside PEMFC becomes better. This study can provide guidance for the design direction of non-uniform PEMFC channel structure, and contribute to the development of high-performance and long-life PEMFC.