采用三通蛇形流场的 PEM 燃料电池在不同工作电压下的性能研究

Q2 Mathematics CFD Letters Pub Date : 2024-06-02 DOI:10.37934/cfdl.16.10.5463
Kaoutar Kabouchi, Mohamed Karim Ettouhami, Hamid Mounir, Khalid Elbikri
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引用次数: 0

摘要

燃料电池的性能受到设计和运行因素的极大影响。流道的设计有助于反应物在流场内的有效分布。因此,流道的几何形状和流场的整体设计在决定燃料电池性能方面起着至关重要的作用。在各种流场设计中,蛇形流场的性能优于其他流场。本研究开发了一个三维质子交换膜燃料电池模型,用于研究三通蛇形流场在不同工作电压(0.9 伏、0.7 伏和 0.5 伏)下对电池性能的影响。本研究的目的是通过分析不同工作电压下阴极沿 Z 轴的通道速度分布、氧分子分数、压力分布和电解质电流密度等参数,模拟和评估三通蛇形流道配置的协调性。数值模拟使用 COMSOL Multiphysics 软件进行。因此,该软件用于数值求解具有电荷守恒、物种传输、动量和连续性等控制方程的完整三维模型。结果表明,在不同的工作电压下,电池电压为 0.5 V 时的通道速度分布、压力分布和电解质电流密度最高。此外,研究还发现,在 0.5 V 的工作电压下,氧气浓度显著下降,这表明燃料电池中的氧气消耗量很大,从而提高了整体效率。这项研究为优化燃料电池性能提供了宝贵的见解,特别是强调了在较低工作电压下三段式蛇形流场设计的有利结果。
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Performance Investigation of PEM Fuel Cell with Three-Pass Serpentine Flow Fields under Varying Operating Voltages
The fuel cells performance is significantly impacted by both design and operational factors. The effective distribution of reactants within the flow fields is facilitated by the design of the flow channels. Therefore, the geometry of the flow channels and the overall design of the flow field play a crucial role in determining the fuel cells performance. Among various flow field designs, the serpentine flow field demonstrates superior performance compared to others. In this research, a three-dimensional proton exchange membrane fuel cell model was developed and used to study the influence of three-pass serpentine flow field on cell performance across varying operating voltages (0.9 V, 0.7 V and 0.5 V). The purpose of this research is to simulate and evaluate the comportment of the three-pass serpentine flow channels configuration by analyzing several parameters such as channels velocity distribution, oxygen mole fraction, pressure distribution and electrolyte current density along the z-axis at the cathode under different operating voltages. Numerical simulations were conducted using the COMSOL Multiphysics software. Therefore, this software is used to solve numerically the complete three-dimensional model with the governing equations of charge conservation, species transport, momentum, and continuity. The obtained results indicate that among different operating voltages, the cell voltage of 0.5 V demonstrated the highest channels velocity distribution, pressure distribution, and electrolyte current density. Moreover, it is found that at an operating voltage of 0.5 V, there is an important decrease in oxygen concentrations indicating a significant oxygen consumption in the fuel cell which improves the overall efficiency. This work contributes valuable insights to the optimization of fuel cell performance, specifically highlighting the favorable outcomes associated with the three-pass serpentine flow field design at lower operating voltages
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来源期刊
CFD Letters
CFD Letters Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
3.40
自引率
0.00%
发文量
76
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