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首页> 外文会议>11th fuel cell science, engineering, and technology conference 2013 >INVESTIGATION OF MECHANICAL BEHAVIOR OF MEMBRANE IN POLYMER ELECTROLYTE FUEL CELLS SUBJECT TO DYNAMIC CHANGES IN LOAD
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INVESTIGATION OF MECHANICAL BEHAVIOR OF MEMBRANE IN POLYMER ELECTROLYTE FUEL CELLS SUBJECT TO DYNAMIC CHANGES IN LOAD

机译：载荷动态变化对高分子电解质燃料电池膜机械行为的影响。

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One of the major barriers for polymer electrolyte membrane (PEM) fuel cells to be commercially viable for stationary and transport applications is the durability of membranes undergoing chemical and mechanical degradation over the period of operation. Toward understanding the effects of operating parameters on membrane durability, this paper presents numerical simulations for a single channel PEM fuel cell undergoing changes in load, by subjecting the unit cell to step change in voltage. The objective is to elucidate the mechanical response of membrane, which is subjected to hygral (water) loading and unloading cycles at constant temperature. Detailed three-dimensional (3D) computational fluid dynamics (CFD) simulations are conducted, taking in to account the complex interactions of water transport dynamics and load changes, to accurately capture the water content in the membrane with changes in cell voltage. The water content obtained through CFD simulations is, in turn, used to carry out two-dimensional (2D) finite element (FE) analysis to predict the mechanical response of the membrane undergoing cyclic change in water content, as the operating voltage is cycled. The effects of cyclic changes in cell potential on the stresses induced, amount of plastic strain and their localization are analyzed for various inlet cathode humidity values for two sections along the length of the fuel cell.
机译：聚合物电解质膜（PEM）燃料电池在固定和运输应用中在商业上可行的主要障碍之一是在运行期间经历化学和机械降解的膜的耐久性。为了理解操作参数对膜耐久性的影响，本文通过使单电池经受电压的阶跃变化，对承受负载变化的单通道PEM燃料电池进行了数值模拟。目的是阐明膜的机械响应，该膜在恒定温度下经受水（水）加载和卸载循环。进行了详细的三维（3D）计算流体动力学（CFD）模拟，并考虑到了水输送动力学和载荷变化之间的复杂相互作用，从而随着电池电压的变化准确地捕获了膜中的水分。通过CFD模拟获得的水含量又被用于进行二维（2D）有限元（FE）分析，以预测随着工作电压循环而发生水含量循环变化的膜的机械响应。对于沿着燃料电池长度的两个部分，对于各种入口阴极湿度值，分析了电池电势的周期性变化对所感应的应力，塑性应变量及其局部化的影响。

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  • 会议地点 Minneapolis MN(US)
  • 作者

    A. Verma; R. Pitchumani;

  • 作者单位

    Advanced Materials and Technologies Laboratory Department of Mechanical Engineering Virginia Tech Blacksburg, VA 24061-0238;

    Advanced Materials and Technologies Laboratory Department of Mechanical Engineering Virginia Tech Blacksburg, VA 24061-0238;

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  • 正文语种 eng
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