当前位置: X-MOL 学术Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Improved energy performance of a PEM fuel cell by introducing discontinuous S-shaped and crescent ribs into flowing channels
Energy ( IF 9 ) Pub Date : 2021-01-27 , DOI: 10.1016/j.energy.2021.119920
Pengcheng Dong , Gongnan Xie , Meng Ni

Better mass transfer, more uniform temperature distribution, small pressure drop, and improved electrochemical performance can be achieved by designing better flow field in PEM fuel cells. In this paper, based on the concept of a sinusoidal rib, two kinds of discontinuous ribs: S-shaped rib and crescent rib, are proposed and introduced into the flow channels of a PEM fuel cell. Results show that the proposed ribs improve the flow field, and the local convection effect becomes stronger due to the velocity field changes. Moreover, a better distribution of O2 concentration is obtained from the better flow pattern, resulting in an improvement of the electrochemical rate and an increase of the temperature. The pressure drop is effectively reduced, and the electrochemical efficiency is improved by up to 23.61% in the condition of high current density, compared to those of the baseline sinusoidal ribbed flow field.



中文翻译:

通过将不连续的S形和月牙形肋引入流动通道中来改善PEM燃料电池的能源性能

通过在PEM燃料电池中设计更好的流场,可以实现更好的传质,更均匀的温度分布,较小的压降和改善的电化学性能。在本文中,基于正弦肋的概念,二种不连续的肋:S -型肋条和月牙肋,提出并引入到PEM燃料电池的流动通道。结果表明,所提出的肋条改善了流场,并且由于速度场的变化,局部对流效果增强。而且,O 2的分布更好从更好的流动模式中获得浓度,导致电化学速率的提高和温度的升高。与基线正弦形肋状流场相比,在高电流密度下,压降得到有效降低,电化学效率提高了23.61%。

更新日期:2021-02-03
down
wechat
bug