Water accumulation in the anode during the operation of a proton exchange membrane fuel cell with the dead-ended anode (DEA) has a significant impact on its performance. In this study, numerical simulation and experimental verification were combined to investigate the water accumulation and water dynamic transfer characteristics in the anode flow field during dead-ended operation and gas purging, respectively. The effects of placement orientation, surface wettability, and purge time on the water dynamic transfer characteristics are investigated. The results show that the placement orientation has significant effects on the water distribution characteristics and drainage for PEMFC. When placed vertically and with a purging time of 50 ms, the liquid water saturation in the channel is 5.52 %, which drains 14.91 % more water than that of horizontal placement. Besides, Water discharge velocity and water removal ratio should be considered comprehensively in the development of the purge strategy, the optimal purging time is 70 ms with the water discharge velocity and water removal rate are 0.39 μl/ms and 97.34 %, respectively. Finally, the transfer process of liquid water in the flow field with DEA mode is observed by visual experiment, and the results of the numerical simulation are verified.

中文翻译：

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气体吹扫过程中无端阳极质子交换膜燃料电池流场液态水动态传递特性的数值研究与实验验证


带有死端阳极（DEA）的质子交换膜燃料电池在运行过程中阳极中的水积累对其性能有显着影响。本研究采用数值模拟和实验验证相结合的方法，分别研究了死端运行和气体吹扫过程中阳极流场的积水和水动态传输特性。研究了放置方向、表面润湿性和吹扫时间对水动态传递特性的影响。结果表明，放置方向对质子交换膜燃料电池的配水特性和排水性能有显着影响。当垂直放置且吹扫时间为 50 ms 时，通道内液态水饱和度为 5.52%，比水平放置多排水 14.91%。此外，在制定吹扫策略时应综合考虑水排放速度和水去除率，最佳吹扫时间为70 ms，水排放速度和水去除率分别为0.39 μl/ms和97.34%。最后通过可视化实验观察了DEA模式流场中液态水的传递过程，并对数值模拟的结果进行了验证。