阴极过量系数与流场布置对风冷燃料电池性能影响的数值模拟

The poor performance of air-cooled fuel cells remains a key issue limiting their commercial application. This study used numerical simulation to investigate the effects of cathode oxygen stoichiometric ratio and hydrogen/ air arrangement on the performance of air-cooled fuel cell. The results indicate that when the stoichiometric ratio is low, air-cooled fuel cells cannot meet the heat dissipation needs. Increasing the stoichiometric ratio is beneficial for thermal management of air-cooled fuel cells, improving the membrane water content in the membrane electrode and fuel cell performance. In order to ensure the safe operation of air-cooled fuel cells, it is necessary to maintain the operation of air-cooled fuel cells at medium to high stoichiometric ratio. Compared with the hydrogen/air co-current arrangement, the hydrogen/air counter-current arrangement strategy is affected by the dry hydrogen at the anode inlet. The membrane electrode exhibits a local dehydration state, resulting in a slight reduction in performance.