Enhancement of combustion performance in a microchannel: Synergistic effects of bluff-body and cavity

doi:10.1016/j.fuel.2019.116940

	Enhancement of combustion performance in a microchannel: Synergistic effects of bluff-body and cavity
	Zhang Z 1,4; Wu K(吴坤)2; Yao W(姚卫)2,3 ; Yuen R 4; Wang J1
通讯作者	Wang, Jian(wangj@ustc.edu.cn)
发表期刊	FUEL
	2020-04-01
卷号	265 页码:11
ISSN	0016-2361
摘要	The stable flame is vulnerable in the micro-scale combustors due to the significant heat loss and the limited residence. In this study, the bluff-body and cavity are integrated in a microchannel to enhance the combustion performance of premixed H-2/air flames. The enhancement and combustion characteristics are investigated numerically, using detailed chemical kinematic mechanisms and conjugate heat transfer. It is found that the reaction zones formed behind the bluff-body in center is merged with the flame anchored by the cavity along the side wall, which converts the single flame tip in the micro cavity-combustor to the "M-type" flame. Moreover, the side dual-cavity configuration can significantly improve the anchorage ability of the central bluff-body through extending the recirculation zone and mitigating the flame stretch rate. Due to the synergistic effects of the bluff-body and cavity, the critical velocity increases from 40 m/s in both the single cavity and the single bluff-body combustors to 56 m/s in the proposed combustor. Improved wall temperature uniformity is also observed as the result of the merged reaction zones. Besides, the effects of the equivalence and blockage ratios are investigated. Results suggest that a moderate equivalence ratio is favored to achieve a stable and high efficiency combustion. As the blockage ratio of the bluff-body increases, the flame stability improved due to the enlarged recirculation zones, whereas the combustion efficiency degrades because of the strengthened flame stretch rate and reduced residence time. Finally, an optimal blockage ratio of 0.4 is proposed for the dual-stabilizer micro-combustor.
关键词	Micro-combustor Bluff-body Cavity Combustion performance Flame-flow interaction
DOI	10.1016/j.fuel.2019.116940
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000508914300041
关键词[WOS]	PLATE FLAME HOLDER ; MICRO-COMBUSTOR ; CH4/AIR FLAMES ; HYDROGEN-AIR ; METHANE/AIR ; TEMPERATURE ; CHANNEL ; LIMIT ; STABILIZATION ; STABILITY
WOS研究方向	Energy & Fuels ; Engineering
WOS类目	Energy & Fuels ; Engineering, Chemical
资助项目	National Key Technologies R&D Program of China[2018YFC0809500] ; Training Program of the Major Research Plan of National Natural Science Foundation of China[91641110]
项目资助者	National Key Technologies R&D Program of China ; Training Program of the Major Research Plan of National Natural Science Foundation of China
论文分区	一类
力学所作者排名	2
RpAuthor	Wang, Jian
引用统计	被引频次：37[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/81596
专题	高温气体动力学国家重点实验室
作者单位	1.Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China; 2.Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 4.City Univ Hong Kong, Dept Civil & Architectural Engn, Kowloon, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Zhang Z,Wu K,Yao W,et al. Enhancement of combustion performance in a microchannel: Synergistic effects of bluff-body and cavity[J]. FUEL,2020,265:11.
APA	Zhang Z,吴坤,姚卫,Yuen R,&Wang J.(2020).Enhancement of combustion performance in a microchannel: Synergistic effects of bluff-body and cavity.FUEL,265,11.
MLA	Zhang Z,et al."Enhancement of combustion performance in a microchannel: Synergistic effects of bluff-body and cavity".FUEL 265(2020):11.

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