Optimization and design of flow channel structure are effective ways to improve the comprehensive performance of proton exchange membrane fuel cells(PEMFC).This paper proposes a new dual trapezoidal tapered flow channel structure for proton exchange membrane fuel cells,constructs and validates its three-dimensional numerical simulation model.Based on the field synergy theory,an evaluation method for analyzing and evaluating the performance of multi-field synergy in PEMFC is proposed.By comparing the parallel trapezoidal flow channel and the tapered trapezoidal flow channel,it is found that the output power of the tapered flow path battery,the hydrogen utilization rate,and the membrane drainage capacity all increase and the maximum temperature gradient decreases.Based on the multi-physical field synergy evaluation index proposed in this paper,it is found that the synergy between the concentration field,temperature field,and velocity field in the cathode/anode flow channel is improved.Compared to the parallel trapezoidal flow channel PEMFC,the synergy between heat and mass transfer and electrokinetic force in the two catalytic layers is improved by an average of 10.4%,and the synergy between the water concentration field,temperature field,and velocity field in the membrane is improved by 25.3%.This research provides a theoretical basis for improving the performance of proton exchange membrane fuel cells.
国家科技期刊平台
NSTL
万方数据
