Extinction of lean near-limit methane/air flames at elevated pressures under normal- and reduced-gravity
文献类型：期刊论文
| 作者 | Zhang H; Fan R; Wang SF(王双峰) ; Tian XQ; Xu K; Wan SX(万士昕); Egolfopoulos FN
|
| 刊名 | Proceedings of The Combustion Institute
 |
| 出版日期 | 2011 |
| 卷号 | 33期号:1页码:1171–1178 |
| 通讯作者邮箱 | haizhang@tsinghua.edu.cn |
| 关键词 | Flame extinction Flammability limits Premixed flames Micro-gravity |
| ISSN号 | 1540-7489 |
| 通讯作者 | Zhang H |
| 合作状况 | 国际 |
| 中文摘要 | 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. |
| 分类号 | 一类 |
| 类目[WOS] | Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical |
| 研究领域[WOS] | Thermodynamics ; Energy & Fuels ; Engineering |
| 关键词[WOS] | FLAMMABILITY LIMITS ; PREMIXED FLAMES ; CH4/AIR |
| 收录类别 | SCI ; EI |
| 原文出处 | http://dx.doi.org/10.1016/j.proci.2010.06.027 |
| 语种 | 英语 |
| WOS记录号 | WOS:000285780200127 |
| 公开日期 | 2011-03-10 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/43309]  |
| 专题 | 力学研究所_国家微重力实验室 |
| 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. |
入库方式： OAI收割
来源：力学研究所
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