| 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
| |
| Source Publication | Proceedings of The Combustion Institute
 |
| 2011 | |
| Volume | 33Issue:1Pages:1171–1178 |
| ISSN | 1540-7489 |
| Abstract | 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. |
| Keyword | flame Extinction Flammability Limits Premixed Flames Micro-gravity |
| DOI | 10.1016/j.proci.2010.06.027 |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000285780200127 |
| WOS Keyword | FLAMMABILITY LIMITS ; PREMIXED FLAMES ; CH4/AIR |
| WOS Research Area | Thermodynamics ; Energy & Fuels ; Engineering |
| WOS Subject | Thermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical |
| Department | NML微重力两相流与燃烧 |
| Classification | 一类 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/43309 |
| Collection | 微重力重点实验室 |
| Corresponding Author | Zhang H |
| Recommended Citation 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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| InProceedings2011.pd（608KB） | 开放获取 | License | View Download | |||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment