摘要
建立了平板式阳极支撑固体氧化物燃料电池的三维数学模型,通过耦合电化学动力学和流体动力学模拟了电池的传热传质等传输现象。采用有限容积法计算了质量、动量、组分与能量守恒方程。研究给出了同向流与反向流情况下电流度密度、电压与功率密度分布。结果显示在同向流情况下,电池的最大功率密度较大,温度分布较均匀合理。进一步研究表明多孔电极结构参数(孔隙率、曲折因子与孔径尺寸)对电池性能有十分重要的影响。比较计算的极化性能与文献的实验数据,结果表明两者吻合的较好。
A three-dimensional mathematical model coupling electrochemical kinetics with fluid dynamics was developed to simulate the transport phenomena in planar anode-supported solid oxide fuel cell （SOFC） such as fluid flows, heat and mass transfer. The finite volume method was applied to the calculation, which is based on the fundament conservation laws of mass, momentum, species and energy. Results of current density, potential and power density distributions for co-flow and counter-flow cases were given out. It was found that cell performance for co-flow case differed from that for counter-flow in higher maximum power output and more uniform temperature distribution. Furthermore, cell performance was investigated in terms of different structure parameters of porous electrode （ porosity, tortuosity and pore size） , all of which have a significant effect on it. Lastly, a comparison of calculated performance and experimental data in literature was made to validate the mathematical model.
出处
《能源工程》
2007年第1期16-21,共6页
Energy Engineering
