氢空质子交换膜燃料电池阴极沿流道模型

A along-the-channel model for cathode channels for H_2/air proton exchange membrane fuel cells

为了优化设计氢空质子交换膜燃料电池阴极的气体流道,建立了沿流道数学模型。模型研究了空气在流道中的动量传递、空气中各组分的质量传递和电极反应。将二维问题经积分均化后转化为较简单的一维问题,于是偏微分方程组转变为常微分方程组,使计算过程得以简化。以50cm长的流道为例,计算了沿流道方向的浓度、流速以及电流密度的分布。还利用此模型考察了各操作与设计参数对浓度、流速和电流密度分布的影响。

A theoretical, along-the-channel model was developed to design fuel channels for H2/air proton exchange membrane fuel cell. The 2-D problem was converted into 1-D problem, and this was implemented by solving the resultant ordinary differential equation with a straightforward shooting computational scheme. With this design tool, the height and length of the channel can be easily designed. An analysis to the effects of main operation and design parameters on the distributions of concentration, velocity and current density was conducted.