Extinction of lean near-limit methane/air flames at elevated pressures under normal- and reduced-gravity

doi:10.1016/j.proci.2010.06.027

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	Extinction of lean near-limit methane/air flames at elevated pressures under normal- and reduced-gravity
	Zhang H; Fan R; Wang SF(王双峰); Tian XQ; Xu K; Wan SX(万士昕); Egolfopoulos FN
发表期刊	Proceedings of The Combustion Institute
	2011
卷号	33 期号:1 页码:1171–1178
ISSN	1540-7489
摘要	perimentally at evaluated pressures and under normal- and micro-gravity conditions utilizing the 3.5 s drop tower of the National Microgravity Laboratory of China. The results showed that under micro-gravity conditions the natural convection is minimized and the flames become more planar and symmetric compared to normal gravity. In both normal- and micro-gravity experiments and for a given strain rate and fuel concentration, the flame luminosity was found to enhance as the pressure increases. On the other hand, at a given pressure, the flame luminosity was determined to weaken as the strain rate decreases. At a given strain rate, the fuel concentration at extinction was found to vary non-monotonically with pressure, namely it first increases and subsequently decreases with pressure. The limit fuel concentration peaks around 3 and 4 atm under normal- and micro-gravity, respectively. The extinction limits measured at micro-gravity were in good agreement with predictions obtained through detailed numerical simulations but they are notably lower compared to the data obtained under normal gravity. The simulations confirmed the non-monotonic variation of flammability limits with pressure, in agreement with previous studies. Sensitivity analysis showed that for pressures between one and 5 atm, the near-limit flame response is dominated by the competition between the main branching, H + O2 ? OH + O, and the pressure sensitive termination, H+O2+M? HO2 + M, reaction. However, for pressures greater than 5 atm it was determined that the HO2 kinetics result in further chain branching in a way that is analogous to the third explosion limit of H2/O2 mixtures. 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
关键词	flame Extinction Flammability Limits Premixed Flames Micro-gravity
DOI	10.1016/j.proci.2010.06.027
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000285780200127
关键词[WOS]	FLAMMABILITY LIMITS ; PREMIXED FLAMES ; CH4/AIR
WOS研究方向	Thermodynamics ; Energy & Fuels ; Engineering
WOS类目	Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
课题组名称	NML微重力两相流与燃烧
论文分区	一类
引用统计	被引频次：18[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/311007/43309
专题	微重力重点实验室
通讯作者	Zhang H
推荐引用方式 GB/T 7714	Zhang H,Fan R,Wang SF,et al. Extinction of lean near-limit methane/air flames at elevated pressures under normal- and reduced-gravity[J]. Proceedings of The Combustion Institute,2011,33,1,:1171–1178.
APA	Zhang H.,Fan R.,王双峰.,Tian XQ.,Xu K.,...&Egolfopoulos FN.(2011).Extinction of lean near-limit methane/air flames at elevated pressures under normal- and reduced-gravity.Proceedings of The Combustion Institute,33(1),1171–1178.
MLA	Zhang H,et al."Extinction of lean near-limit methane/air flames at elevated pressures under normal- and reduced-gravity".Proceedings of The Combustion Institute 33.1(2011):1171–1178.

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