Surrogate modeling for transient electrochemical potential analysis for SOFC using proper orthogonal decomposition

IF 3 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
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引用次数: 0

Abstract

This study presents a procedure for creating a surrogate model for the transient electrochemical potential analysis of solid oxide fuel cells (SOFCs) by applying proper orthogonal decomposition (POD), which takes into account the characteristics of the spatial distribution of oxygen potential. In the proposed procedure, the time-variation of oxygen potential distributions in an SOFC are determined by numerical simulations under various analytical conditions with different explanatory variables or, equivalently, input parameters, and the results are stored in a separate data matrix for each component in accordance with certain rules. Then, POD is applied to each data matrix to create an individual surrogate model for the corresponding component using the dominant modes on the basis of contribution rates and/or mean square errors. The created models are used separately to obtain the oxygen potential distribution in the entire domain of the SOFC for an arbitrary set of input parameters at a low computational cost. A notable aspect of the proposed approach is that the positions and values of oxygen potential in two electrodes and interconnectors are data points and responses, respectively, but play opposite roles in the electrolyte region where the oxygen potential changes abruptly. Therefore, before combining the responses from the individual surrogate models, the oxygen potential values must be calculated backward from the coordinate values in the electrolyte. Representative numerical examples are presented to validate the appropriateness of the analysis procedure by applying the surrogate models with input parameters other than those used in the training process in comparison with the results obtained using the transient electrochemical potential.

利用适当的正交分解为 SOFC 的瞬态电化学势分析建立代用模型
本研究提出了一种程序,通过应用适当的正交分解(POD),为固体氧化物燃料电池(SOFC)的瞬态电化学电位分析创建代用模型,其中考虑到了氧电位空间分布的特点。在建议的程序中,SOFC 中氧电势分布的时间变化是在不同的分析条件下,通过不同的解释变量或输入参数进行数值模拟确定的,并按照一定的规则将结果存储在每个组件的单独数据矩阵中。然后,将 POD 应用于每个数据矩阵,根据贡献率和/或均方误差,使用主导模式为相应的组件创建一个单独的代理模型。创建的模型可单独使用,以较低的计算成本获得 SOFC 整个域中任意一组输入参数的氧势分布。所提方法的一个显著特点是,氧电势在两个电极和互联器中的位置和数值分别是数据点和响应,但在氧电势突然变化的电解质区域却起着相反的作用。因此,在合并各个代用模型的响应之前,必须根据电解质中的坐标值反向计算氧电位值。通过应用输入参数不同于训练过程中使用的参数的代用模型,并与使用瞬态电化学势获得的结果进行比较,展示了具有代表性的数值示例,以验证分析程序的适当性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Solid State Ionics
Solid State Ionics 物理-物理:凝聚态物理
CiteScore
6.10
自引率
3.10%
发文量
152
审稿时长
58 days
期刊介绍: This interdisciplinary journal is devoted to the physics, chemistry and materials science of diffusion, mass transport, and reactivity of solids. The major part of each issue is devoted to articles on: (i) physics and chemistry of defects in solids; (ii) reactions in and on solids, e.g. intercalation, corrosion, oxidation, sintering; (iii) ion transport measurements, mechanisms and theory; (iv) solid state electrochemistry; (v) ionically-electronically mixed conducting solids. Related technological applications are also included, provided their characteristics are interpreted in terms of the basic solid state properties. Review papers and relevant symposium proceedings are welcome.
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