连接体结构对固体氧化物燃料电池性能影响的数值分析

固体氧化物燃料电池（SOFC）中连接体结构对电池性能有重要影响。为探究连接体结构对固体氧化物燃料电池性能的影响，建立了传统直通、圆柱形、矩形和凹形4种不同连接体结构SOFC的三维数值模型，并对其流体流动、组分传递、电化学反应和固体流体传热的多物理场耦合过程进行了数值模拟。结果表明，在一定条件下，圆柱形、矩形和凹形连接体结构有利于电池中气体的传输，使电池的电流密度和输出功率均有所提升，其中凹形连接体结构的提升效果最明显，圆柱形、矩形连接体结构的次之。不同孔隙率下圆柱形、矩形和凹形连接体结构均优于传统直通连接体结构，在阴极孔隙率较小时其优势更加明显。

Numerical analysis on the performance of solid oxide fuel cells with different interconnector structures

The interconnector structure of solid oxide fuel cell (SOFC) plays a decisive role in the performance of fuel cells. In this paper, a three-dimensional numerical model of SOFC with four different types of interconnectors such as straight, cylindrical, rectangular, and concave was established to explore the effect of interconnector structure on the SOFC performance. Numerical analysis on the multi-physical field coupling process of fluid flow, species transfer, electrochemical reaction and solid-fluid heat transfer was performed. The results indicate that the cylindrical, rectangular, and concave interconnector can enhance the gas transport and increase the current density and power density in SOFC under certain conditions. Among these structures, the largest improvement is observed for the concave interconnector, following by the cylindrical and rectangular interconnectors. Within the whole investigated range of porosity, the cylindrical, rectangular, and concave interconnectors are superior to the straight interconnector, especially at smaller cathode porosity.