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Cell-to-Cell Variations with Increasing SOFC Stack Size

机译:SOFC堆栈大小增加的单元间变化

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This numerical study considers the influence of stack size on cell-to-cell performance variations within a stack of planar solid oxide fuel cells. In order to model large stacks ( > 10 cells) a pseudo 2-D scheme was implemented using the parallel technique of domain decomposition and was solved on a Beowulf cluster. Results were obtained for stacks of 5, 10, and 20 cells. The results indicate that although significant variations in temperature were observed the voltage variations were practically negligible for cases with uniform flow distribution. Non-uniform fuel flow distribution resulted in more significant cell voltage variations. With the assumption of adiabatic boundary conditions, increasing stack size resulted in slightly lower average cell temperatures but increased outlet temperature of the fuel and air channel in the top cell.
机译:这项数值研究考虑了堆大小对平面固体氧化物燃料电池堆中电池间性能变化的影响。为了建模大型堆栈(> 10个单元),使用域分解的并行技术实现了伪2-D方案,并在Beowulf群集上进行了求解。对于5个,10个和20个单元的堆栈获得了结果。结果表明,尽管观察到温度有显着变化,但对于流量分布均匀的情况,电压变化实际上可以忽略不计。燃料流量分布不均匀导致电池电压变化更为明显。在绝热边界条件的假设下,增加烟囱尺寸会导致平均电池温度略低,但顶部电池中的燃料和空气通道的出口温度会增加。

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