• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Energy Conversion & Management >Enhancement of PEM fuel cell performance by flow channel indentation
【24h】

Enhancement of PEM fuel cell performance by flow channel indentation

机译：通过流道压痕增强PEM燃料电池的性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A three-dimensional, steady, single-phase flow of oxygen, nitrogen and water vapor mixture in the cathode of proton exchange membrane (PEM) fuel cell was numerically studied here. It was shown that the performance of the cell was enhanced by partial blockage of the flow channels in a parallel flow field. Since, channel indentation could increase oxygen content within the catalyst layer. It was observed that the influence of channel indentation in high current density regions was noticeable. Various types of blocks with profile shapes: square (SOJ, semicircle (SC) and trapezoid (TR) were considered. Enhancements were compared with the no-dent (ND) called as the base case. The voltage to current relation was modeled using the Tafel equation. This provided the distribution of current density at a prescribed cell voltage. The computations were performed at 333 K, 100,000 Pa, water dew point temperature 313 K, and 50% utilization within the range of 0.2-0.8 V. It was predicted that the flow turns to be two-phase in high current density regions (say cell voltages less than 0.4 V). To push the condensate out of the flow field, adequate pressure gradient were required. This prerequisite was already taken into account in this study. A parametric study considering the influences of dent heights and arrangements, exchange current density, fluid viscous resistance and rib sizes were considered providing enhancements over 25% in the net power. The present study gives a very helpful guideline for flow field manufactures. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在此，对质子交换膜（PEM）燃料电池阴极中的氧，氮和水蒸气混合物的三维稳定单相流进行了数值研究。结果表明，在平行流场中，流动通道的部分堵塞增强了电池的性能。因为，通道压痕会增加催化剂层内的氧含量。观察到在高电流密度区域中沟道压痕的影响是明显的。考虑了各种形状轮廓的块：正方形（SOJ，半圆（SC）和梯形（TR）），并与称为基本情况的无凹痕（ND）进行了比较，并使用Tafel方程，提供了规定电池电压下的电流密度分布，计算在333 K，100,000 Pa，水露点温度313 K和50％利用率在0.2-0.8 V范围内进行。在高电流密度区域（例如，电池电压低于0.4 V），流动变成两相；为了将凝结水推出流场，需要足够的压力梯度；在此研究中已经考虑到了此前提条件。考虑到凹痕高度和排列，交流电流密度，流体粘性阻力和肋骨尺寸的影响的参数研究被认为可以提供超过25％的净功率增强效果。流场制造的理想选择。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号