文献类型：期刊文献

英文题名：Phenomenological characteristics of hydrogen/air premixed flame propagation in closed rectangular channels

作者：Shen, Xiaobo[1,2];Xu, Jiaying[1];Wen, Jennifer X.[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]Univ Warwick, Sch Engn, Warwick FIRE, Coventry CV4 7AL, W Midlands, England

年份：2021

卷号：174

起止页码：606

外文期刊名：RENEWABLE ENERGY

收录：;EI(收录号：20211910320251);WOS:【SCI-EXPANDED(收录号:WOS:000654248500001)】；

基金：The authors gratefully acknowledge the financial support of the National Key R&D Program of China (2018YFC0809300) and the National Natural Science Foundation of China (Grant No. 22078095 and 51604121) .

语种：英文

外文关键词：Hydrogen; Premixed flame; Aspect ratio; Flame deformation; Dynamics

摘要：The propagation of hydrogen/air premixed flame in channels were investigated, giving particular focus on the effect of aspect ratio through both experimental and numerical investigations. The schlieren system and pressure sensor were used to capture flame shapes and pressure changes, respectively in a channel with aspect ratio of 12. The phenomena of flame shape evolutions, including classic tulip inversion, featured T-shape flame, elongated tulip flame and tulip distortion captured in the experiments, were well reproduced by the numerical simulation. The predicted flame front speed, pressure build-up and their fluctuations are also in reasonably good agreement with the measurements. The validated numerical modelling approach was then applied to investigate the effect of channel aspect ratio on flame shape change, flame propagation and overpressure dynamics. It was found that with increasing aspect ratio, the flame shape changes become more vigorous accompanied by the amplified flame and pressured dynamics due to the enhanced pressure waves, flame-pressure wave interaction and flame instability. The Bychkov's analytical model was used to give predictions on the characteristic times of flame deformation in the channels. By comparison, the analytical model performs better for channel with lower aspect ratio. (c) 2021 Elsevier Ltd. All rights reserved.