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Experimental investigation and numerical analysis on flame stabilization of CH4/air mixture in a mesoscale channel with wall cavities
Wan, Jianlong1; Fan, Aiwu1; Liu, Yi1; Yao, Hong1; Liu, Wei1; Gou, Xiaolong2; Zhao, Daiqing3
2015-04-01
发表期刊COMBUSTION AND FLAME
卷号162期号:4页码:1035-1045
摘要Behaviors of premixed CH4/air flame in mesoscale channels with and without cavities were experimentally investigated. No stable symmetric flame was observed in the channel without cavities and flame is prone to inclining and pulsating. In contrast, flame can be effectively anchored in the presence of cavities. When the inlet velocity is increased sufficiently high, curved fluctuating flame front appears. Blow-off limits of the channel with cavities are several times larger than the corresponding burning velocity of incoming CH4/air mixture, while the flashback limits are almost the same as the straight channel counterparts. These indicate that the cavities have a strong ability to extend the operational range of inlet velocity. Numerical simulation demonstrates that combined effects, i.e., the formation of recirculation zone and low velocity zone in the cavities, preferential diffusion effect, as well as the preheating effect of upstream inner walls, are major mechanisms responsible for flame stabilization. Furthermore, numerical result reveals that large strain rate and heat loss rate exist at the transition point between the ramped cavity wall and the downstream inner wall, which results in flame splitting at high inlet velocity due to local extinction, and eventually leads to flame blow-off. In summary, the combustion behaviors in the mesoscale channel with cavities strongly depend on the interactions between the reaction zone, conjugate heat exchange and flow field. (C) 2014 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
文章类型Article
关键词Micro Combustion Cavity Preheating Effect Preferential Diffusion Effect Stretch Effect Heat Loss
WOS标题词Science & Technology ; Physical Sciences ; Technology
DOI10.1016/j.combustflame.2014.09.024
研究领域[WOS]Thermodynamics ; Energy & Fuels ; Engineering
关键词[WOS]BLUFF-BODY ; MICRO-COMBUSTOR ; HYDROGEN/AIR FLAME ; NONPREMIXED FLAMES ; PREMIXED FLAMES ; H-2/AIR MIXTURE ; NARROW CHANNEL ; AIR MIXTURES ; HEAT ; STABILITY
收录类别SCI
语种英语
WOS类目Thermodynamics ; Energy & Fuels ; Engineering, Multidisciplinary ; Engineering, Chemical ; Engineering, Mechanical
WOS记录号WOS:000351794100012
引用统计
文献类型期刊论文
条目标识符http://ir.giec.ac.cn/handle/344007/9102
专题中国科学院广州能源研究所
作者单位1.Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China
2.Chongqing Univ, Sch Power Engn, Chongqing 400044, Peoples R China
3.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
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Wan, Jianlong,Fan, Aiwu,Liu, Yi,et al. Experimental investigation and numerical analysis on flame stabilization of CH4/air mixture in a mesoscale channel with wall cavities[J]. COMBUSTION AND FLAME,2015,162(4):1035-1045.
APA Wan, Jianlong.,Fan, Aiwu.,Liu, Yi.,Yao, Hong.,Liu, Wei.,...&Zhao, Daiqing.(2015).Experimental investigation and numerical analysis on flame stabilization of CH4/air mixture in a mesoscale channel with wall cavities.COMBUSTION AND FLAME,162(4),1035-1045.
MLA Wan, Jianlong,et al."Experimental investigation and numerical analysis on flame stabilization of CH4/air mixture in a mesoscale channel with wall cavities".COMBUSTION AND FLAME 162.4(2015):1035-1045.
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