文献类型：期刊文献

英文题名：Effects of aspect ratio and initial pressure on asymmetric flame and flame instability of premixed CO/air

作者：Dou, Zengguo[1,2];Shen, Xiaobo[1,3];Zhang, Zhenwu[1];Zhou, Feng[4];Ma, Yunsheng[5];Zou, Xiong[5];Liu, Haifeng[1,2];Wang, Fuchen[1,2]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Clean Coal Technol, Shanghai 200237, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China;[4]Shanghai Fire Res Inst MEM, Shanghai 200032, Peoples R China;[5]Shandong Chambroad Holding Grp Co Ltd, Binzhou 256500, Shandong, Peoples R China

年份：2023

卷号：278

外文期刊名：ENERGY

收录：;EI(收录号：20232114118263);WOS:【SCI-EXPANDED(收录号:WOS:001005416200001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 22078095 and 22278135) and the Shanghai Science and Technology Committee (Grant Nos. 20dz1200903 and 21QC1400400) . The authors sincerely thank these supports.

语种：英文

外文关键词：Combustion; Buoyancy effect; Asymmetric flames; Flame instability

摘要：Syngas is a promising alternative energy carrier with low carbon and pollutants emissions, and CO is the main component. The combustion characteristics of stoichiometric CO/air mixtures with varied initial pressure (0.5-1.5 atm) and aspect ratio (12-40) were examined through experiments in a rectangular closed duct. This experiment simulated the transport and storage conditions of CO to study its combustion characteristics at different aspect ratios and initial pressures. The flame images and overpressure dynamics were captured by highspeed camera and pressure sensor, respectively. Experiment results proved that the increase in aspect ratio had an important effect on flame shape evolution. The tilted flame for low aspect ratios was affected by buoyancy, while flames with high aspect ratios were influenced by competing buoyancy and intrinsic instability. The results showed that the flame morphology and dynamics were enhanced with increasing aspect ratio and initial pressure. The intrinsic instability of premixed CO/air combustion was investigated, and the formation mechanism of tilted flame and twisted flame were comprehensively analyzed. Qualitative distinctions were made between symmetric and asymmetric flame morphology regimes.