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首页> 外文期刊>Journal of power sources >The Effect Of Air Stoichiometry Change On The Dynamic Behavior Of A Proton Exchange Membrane Fuel Cell
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The Effect Of Air Stoichiometry Change On The Dynamic Behavior Of A Proton Exchange Membrane Fuel Cell

机译：空气化学计量变化对质子交换膜燃料电池动态行为的影响

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摘要

Numerical simulations are carried out in this paper, to study the effect of air stoichiometry change on a single-channel proton exchange membrane (PEM) fuel cell undergoing load change. For this purpose, the air stoichiometry change rate and pattern, as well as its lagging time to the load change and initial value, are taken into account in this model, respectively. The transient response of cell potential to load change has been investigated and the undershoot behavior has been observed. Detailed results are further presented to show the transient response of the cell in terms of local current density and oxygen mass fraction distributions. This work shows that the extent of air dilution/starvation down the channel depends on the air stoichiomtric flow ratio change rate, pattern, etc. It is also shown this undershoot can be eliminated by adjusting the initial air flow ratio, or by improving the air flow ratio change rate, etc. Finally, the validity of the numerical model in this paper is verified by the comparison between the model results and experimental data, showing that this numerical model can be resorted to reveal the effects of air stoichiometry change on the dynamic behavior of a PEMFC.
机译：本文进行了数值模拟，以研究空气化学计量变化对单通道质子交换膜（PEM）燃料电池承受负荷变化的影响。为此，在该模型中分别考虑了空气化学计量变化率和模式，以及其到负载变化的滞后时间和初始值。已经研究了电池电位对负载变化的瞬态响应，并观察到下冲行为。进一步给出了详细的结果，以根据局部电流密度和氧气质量分数分布显示电池的瞬态响应。这项工作表明，沿通道向下的空气稀释/饥饿程度取决于空气化学计量比的变化率，模式等。还表明可以通过调节初始空气流量或改善空气来消除下冲现象。最后，通过将模型结果与实验数据进行比较，验证了本文数值模型的正确性，表明该数值模型可用来揭示空气化学计量变化对动力特性的影响。 PEMFC的行为。

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