微管固体氧化物燃料电池的热应力分析

Thermal stress analysis of a micro-tubular solid oxide fuel cell

微管固体氧化物燃料电池(MT-SOFC)的寿命一直是制约其商业化进程的关键问题。希望利用多物理场耦合方式分析工作状态微管固体氧化物燃料电池在流体、热、力等作用下的应力分布,分析工作温度、温度梯度等因素对电池应力状态的影响。结果表明制造残余应力是电池失效的主要应力源,温度梯度造成这一残余应力进一步分化;工作温度升高有助于残余应力的降低,但电池的效率也会降低。该结果将为MT-SOFC寿命分析提供依据。

Life is the key to limit the commercialization of micro tubular solid oxide fuel cell （MT-SOFC）. In this work, multi-physical field couple was applied to analyze the stress distribution of MT-SOFC under fluid, thermal and mechanics. The effects of working temperature, temperature gradient, etc on stress of MT-SOFC were analyzed. The results show that the residual stress is the main stress source of MT-SOFC failure, and the residual stress is further broken up by the temperature gradient. The rise of working temperature reduce the residual stress at the cost of efficiency reduce. The results are important for studying the life and final spallation of MT-SOFC.