固体氧化物燃料电池的三维数值模拟

Three-dimensional numerical simulation of solid oxide fuel cell

发展了一个用于固体氧化物燃料电池的三维数学模型,模型同时考虑了流体流动、热量传递、电荷传递、多组分传递和电化学动力学。研究的区域包括阳极和阴极的流道、扩散层和催化层,以及中间的电解质层在内的整个电池。采用统一的数学方程描述整个区域的传递现象,而用不同的源项和相应的物性参数反映不同性质的层。通过计算流体动力学(CFD)技术求解传递方程组,并耦合电化学动力学方程,获得了电池内的流动、温度、压力、反应物组分浓度等分布,并将模拟得到的极化性能与文献中的实验数据进行了比较,结果表明两者符合得较好。

A three-dimensional mathematical model considering fluid flow, heat transfer, charge transfer, species transport and electrochemical reaction in solid oxide fuel cell was developed. The studied domain consists of fluid channels, electrolyte, diffusion layers and activation layers of cathodes and anodes. The transport phenomena which occurred in the whole solid oxide fuel cell is described by the generalized equation, in which different parameters and source terms are employed for different layers. The flow characteristics, distributions of temperatures and pressures, and component concentrations in 3-D space are obtained by solving the transport equation set coupled with the electrochemical kinetics equations. The general differential equations are solved by computation fluid dynamics technique. A comparison of predicted performance and experimental data in literature was made to validate the mathematical model.