文献类型：期刊文献

英文题名：Premixed syngas/air combustion in closed ducts with varied aspect ratios and initial pressures

作者：Shen, Xiaobo[1,2];Zhang, Zhenwu[1];Dou, Zengguo[1,3];Cong, Beihua[4];Xiao, Qiuping[5];Liu, Haifeng[1,3]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[3]East China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China;[4]Tongji Univ, Shanghai Inst Disaster Prevent & Relief, Shanghai 200092, Peoples R China;[5]Shanghai Res Inst Chem Ind, 2666 West Guangfu Rd, Shanghai 200062, Peoples R China

年份：2022

卷号：254

外文期刊名：ENERGY

收录：;EI(收录号：20222412232157);WOS:【SCI-EXPANDED(收录号:WOS:000816893000012)】；

基金：This work was supported by the National Natural Science Foundation of China, China (Grant No. 22078095) and the Shanghai Science and Technology Committee, China (Grant No.19QB1402800, 20dz1200903 and 21QC1400400) .

语种：英文

外文关键词：Syngas; Initial pressure; Aspect ratio; Instability; Acoustic effect

摘要：Syngas is a promising renewable energy carrier, and its combustion can result in a significant reduction of pollutant emissions. However, syngas has various production sources, its compositions are diverse accordingly. That brings some challenges in its practical application. Therefore, in order to deeply investigate the premixed stoichiometric syngas/air combustion in confined spaces, experiments were conducted in a closed duct with varied aspect ratios (12, 26 and 40) and initial pressures from 0.5 atm to 1.5 atm. Flame shape evolutions in varied cases were captured through high-speed photography, and four flame speed oscillation regimes were distinguished qualitatively. The pressure buildup was recorded by sensors and scrutinized by dimensionless method. The results denoted the propagation dynamics became more violent with higher initial pressure or aspect ratio. Further, the combustion instability was examined, and it indicated the acoustic effect and the Rayleigh-Taylor/Richtmyer-Meshkov instability would be stronger in cases with large aspect ratio, resulting in the deformation of elongated tulip flame. Besides, the Bychkov's theory considering gas compression effect was validated by the experimental data. The discrepancy between them was interpreted with a comprehensive view of enlarged laminar burning speed, non-adiabatic sidewall and finite flame front thickness.(c) 2022 Elsevier Ltd. All rights reserved.