阴极流道分流进气对燃料电池性能影响的实验研究

Experimental study of the influence of cathode flow-field with a sub-channel on PEM fuel cell performance

中文关键词: 质子交换膜燃料电池  水淹问题  分流进气  电池性能

英文关键词: PEM fuel cell  water-flood  sub-channel  cell performance

中文摘要:

      针对高工作电流密度下，燃料电池内局部水淹导致的传质损失问题，本研究提出了一种阴极流道多进口分流进气方式。实验研究了三种典型分流口位置及分流进量对电池性能的影响。研究发现随着分流口远离阴极主进气口，电池性能呈现先上升后下降的趋势，且当分流口靠近主进气口时，增加分流量有助于电池性能提升，但分流量的增加对电池性能的提升存在一个极限值；因此，在对电池进行分流进气优化时需综合考虑分流口位置和分流量的影响。当分流口为SIP-30%且分流量为按化学当量比ξc = 0.75取值时，分流进气方式相比传统进气方式，电池的最大功率密度高出17.8%。

英文摘要:

      Under high operation current density, the water flooding in PEM fuel cell will result into mass transport loss and bring down the cell performance, hence, a new design for a cathode flow-field with a sub-channel inlet was proposed and experimentally analyzed in a parallel flow-field PEM fuel cell. Three sub-channel inlets were placed along the cathode channel. The results indicated that with the increment in distance between the sub-channel inlet and main inlet, the cell performance firstly increased and then decreased, moreover, when the sub-channel inlet was closed to the main inlet, with the increment in flow rate of sub-channel inlet, the cell performance increased. However, the increment in the flow rate of sub-channel inlet has a limit for the improvement of cell performance. Therefore, the influence of the sub-channel inlet and flow rate of sub-channel inlet should be taken into consider in the optimization of the fuel cell with sub-channels. The result shows under the SIP-30% with cathode stoichiometric ratio for sub-channel of 0.75, the maximum power density improve by 17.8% comapred to the conventional design.