首页> 外文期刊>Renewable Power Generation, IET >Thermo-mechanical stress in tubular solid oxide fuel cells: Part II ?? operating strategy for reduced probability of fracture failure
【24h】

Thermo-mechanical stress in tubular solid oxide fuel cells: Part II ?? operating strategy for reduced probability of fracture failure

机译:管状固体氧化物燃料电池中的热机械应力:第二部分降低骨折失败概率的操作策略

获取原文
获取原文并翻译 | 示例
           

摘要

A spatially discretised thermo-electrochemical model is developed to calculate the temperature distribution in a tubular solid oxide fuel cell (SOFC). This is used in a mechanical model to compute the distribution of thermo-mechanical stress in the ceramic membrane-electrode assembly of the cell. The resulting risk of fracture failure is determined by means of Weibull analysis. Part I of this work covers the dynamic operating properties of the SOFC and the time scale of material creep in its ceramic components. This work, Part II, deals with the risk of fracture failure related to transient operating scenarios, discusses its dependency on the operating conditions and derives a low-risk operating strategy. Contrary to the common perception, thermal gradients are found to have little impact on thermo-mechanical stress in the studied SOFC. Failurerelevant stress levels arise merely due to thermal mismatch of the ceramic layers. Regarding the operating strategy, the dynamics of changes in operating conditions are of minor importance for the resulting risk of failure, while operating strategies aiming at a constant mean cell temperature prove to be advantageous. The consideration of material creep is shown to be essential for a sound analysis of thermo-mechanical stress and risk of fracture in the investigated SOFC.
机译:建立了空间离散的热电化学模型,以计算管状固体氧化物燃料电池(SOFC)中的温度分布。在机械模型中使用它来计算电池的陶瓷膜电极组件中的热机械应力分布。断裂失败的风险通过威布尔分析确定。这项工作的第一部分介绍了SOFC的动态运行特性以及陶瓷组件中材料蠕变的时间尺度。这项工作(第二部分)涉及与瞬态运行场景相关的断裂失败风险,讨论了其对运行条件的依赖性,并得出了低风险的运行策略。与通常的看法相反,在研究的S​​OFC中发现热梯度对热机械应力影响很小。与失效相关的应力水平仅由于陶瓷层的热失配而产生。关于操作策略,操作条件变化的动态对于最终的故障风险不太重要,而以恒定的平均电池温度为目标的操作策略则被证明是有利的。研究表明,对于所研究的SOFC中的热机械应力和断裂风险的合理分析,必须考虑材料蠕变。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号