The pressure drops and pumping powers in flow channels of proton exchange membrane fuel cells are major standards to evaluate flow channel structures. Baffled flow channels provide higher performance, while the pressure drop and pumping power both aggravate. In this work, the impact of baffle leeward length on power output and pressure drops of proton exchange membrane fuel cells are experimentally studied. The pumping power, net power and power efficiency are calculated as well. Experimental results indicate that pressure drops increase when adding baffles in channels, and longer leeward lengths result in lower pressure drops. Higher cell temperature results in lower pressure drops. The time consuming for stabilizing pressure drop are shortened when using baffles having longer leeward lengths. The net power is increased when using larger baffles, and the highest net powers occur under the temperature of 333K or 343K. In addition, raising the cell temperature can increase the power efficiency, and when the leeward lengths of baffles are decreased, the power efficiency is also decreased. When using baffle without sloping leeward sides, the power efficiency can be decreased to 45.14% under lower cell temperature of 323K.

质子交换膜燃料电池流道中的压降和泵浦功率是评估流道结构的主要标准。折流板通道可提供更高的性能，同时压降和泵送功率都会加剧。在这项工作中，实验研究了背风长度对质子交换膜燃料电池功率输出和压降的影响。还计算了泵浦功率，净功率和功率效率。实验结果表明，在通道中添加挡板时，压降会增加，而较长的下风长度会导致压降降低。较高的电池温度导致较低的压降。当使用具有较长的下风长度的挡板时，缩短了稳定压力下降的时间。使用较大的挡板时，净功率会增加，最高净功率发生在333K或343K的温度下。另外，升高电池温度可以提高功率效率，并且当减小挡板的背风长度时，功率效率也降低。当使用不倾斜背风面的挡板时，在较低的323K电池温度下，功率效率可以降低到45.14％。