船用固体氧化物燃料电池多物理场耦合模型与热应力分析

Multiphysics Coupling Model and Thermal Stress Analysis of Solid Oxide Fuel Cell for Ships

为拓展燃料电池在船舶领域内的应用,针对固体氧化物燃料电池(SOFC)作为典型船舶电力推进系统动力时的电化学性能和热应力场分布规律进行研究。以实际生产的SOFC为原型,基于有限元法分别建立了矩形和弧形流道的多物理场三维模型,分析了典型工况下电极电化学反应、多组分传质和传热过程的耦合特性,并模拟了不同功能层的热应力。结果表明:相同工况下,相较于矩形流道,弧形流道在气体组分和温度梯度分布上更均匀;阴极电解质接触面上的热应力要高于阳极侧,且弧形流道的最大值相较于矩形流道,减少了43.3%;电流密度的最大值均位于肋板与电极交界处。

In order to expand the application of fuel cell in marine field,the electrochemical performance and thermal stress field distribution of solid oxide fuel cell(SOFC)as the power of typical marine electric propulsion system are studied.A three-dimensional multi-physics model is developed for the rectangular and arch flow channels based on a practical SOFC by employing finite element method.The correlation with electrochemical reactions,the multi-component heat and mass transfer processes in the electrodes under typical working conditions are analyzed.The determination of the thermal stress is analyzed.The results show that under the same working conditions,the cell within the arch channels is more even than that within the rectangular channels,in terms of the distribution for the gas composition and temperature gradient.The thermal stress on the cathodic contacting surface is higher than that on the anodic side,while that for the case with the arch channels is 43.3%obviously lower than that within the rectangular channels.The maximum current density of the two flow channels is located at the junction of the ribs and the electrodes.