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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
Source PublicationCOMBUSTION AND FLAME
Volume162Issue:4Pages:1035-1045
AbstractBehaviors 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.
SubtypeArticle
KeywordMicro Combustion Cavity Preheating Effect Preferential Diffusion Effect Stretch Effect Heat Loss
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1016/j.combustflame.2014.09.024
WOS Subject ExtendedThermodynamics ; Energy & Fuels ; Engineering
WOS KeywordBLUFF-BODY ; MICRO-COMBUSTOR ; HYDROGEN/AIR FLAME ; NONPREMIXED FLAMES ; PREMIXED FLAMES ; H-2/AIR MIXTURE ; NARROW CHANNEL ; AIR MIXTURES ; HEAT ; STABILITY
Indexed BySCI
Language英语
WOS SubjectThermodynamics ; Energy & Fuels ; Engineering, Multidisciplinary ; Engineering, Chemical ; Engineering, Mechanical
WOS IDWOS:000351794100012
Citation statistics
Cited Times:48[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/9102
Collection中国科学院广州能源研究所
Affiliation1.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
Recommended Citation
GB/T 7714
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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