文献类型：期刊文献

英文题名：Bidirectionally coupled multiphysics modeling of SOFCs: Start-up acceleration, wave-channel advantages, and dynamic responses

作者：Su, Xiaoyi Jia, Li Dang, Chao Ding, Yong An, Zhoujian

第一作者：Su, Xiaoyi

通信作者：Dang, C[1]

机构：[1]Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing Key Lab Flow & Heat Transfer Phase Changin, Beijing 100044, Peoples R China;[2]Guizhou Inst Technol, Sch Aerosp Engn, Guiyang 550025, Peoples R China;[3]Lanzhou Univ Technol, Sch Energy & Power Engn, Lanzhou 730050, Peoples R China

第一机构：Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing Key Lab Flow & Heat Transfer Phase Changin, Beijing 100044, Peoples R China

通信机构：corresponding author), Beijing Jiaotong Univ, Sch Mech Elect & Control Engn, Beijing Key Lab Flow & Heat Transfer Phase Changin, Beijing 100044, Peoples R China.

年份：2026

卷号：225

外文期刊名：INTERNATIONAL JOURNAL OF THERMAL SCIENCES

收录：;EI(收录号：20260720066307);WOS:【SCI-EXPANDED(收录号:WOS:001690383100001)】；

基金：The paper was fund and supported by National Key Research and Development Program (2023YFB4006004), Beijing Municipal Science & Technology Commission (Z231100006123010), and Guizhou Provincial Major Scientific and Technological Program (XKBF (2025) 031).

语种：英文

外文关键词：Solid oxide fuel cell; Multi-physics coupling; Start-up process; Dynamic responses

摘要：Based on a bidirectionally strongly coupled multiphysics transient model, this study investigated the dynamic characteristics and influencing factors of solid oxide fuel cells (SOFCs) during start-up stage. The effects and mechanisms of operating temperature, flow channel structure, and operational parameters on start-up duration, temperature distribution, current density, and fuel utilization were explored. Additionally, the dynamic impacts of fluctuations in voltage, temperature, and inlet flow velocity on operational stability were analyzed. Results showed that increasing the switching temperature (ST) from 473 K to 973 K reduced the SOFC start-up duration by 38.6%. Maximum temperature gradients were observed at the initial and final stages of start-up. Compared with straight channels, wavy channels prolonged the start-up duration by 23% but enhanced the steady-state current density by 17.5%, with only a 1.3% increase in average temperature. Fluctuations in operating temperature dominated the effects on current density, fuel utilization, and average temperature, while the impact of inlet flow velocity was negligible. Current density responded most rapidly to parameter fluctuations (600-1400 s), and average temperature responded the slowest (2300-2400 s). A 40% reduction in operating temperature led to a 98.4% plummet in current density and a 40.7% decrease in average temperature. This study provided theoretical and practical support for the development of rapid start-up strategies and optimized flow channel designs for SOFCs.