| 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
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| 发表期刊 | Proceedings of The Combustion Institute
 |
| 2011
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| 卷号 | 33期号:1页码:1171–1178 |
| ISSN | 1540-7489
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| 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
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| URL | 查看原文
|
| 收录类别 | SCI
; EI
|
| 语种 | 英语
|
| WOS记录号 | WOS:000285780200127
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| 关键词[WOS] | FLAMMABILITY LIMITS
; PREMIXED FLAMES
; CH4/AIR
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| 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
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| 引用统计 |
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| 文献类型 | 期刊论文
|
| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/43309
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| 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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