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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
Source PublicationProceedings of The Combustion Institute
Abstractperimentally 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.
Keywordflame Extinction Flammability Limits Premixed Flames Micro-gravity
Indexed BySCI ; EI
WOS IDWOS:000285780200127
WOS Research AreaThermodynamics ; Energy & Fuels ; Engineering
WOS SubjectThermodynamics ; Energy & Fuels ; Engineering, Chemical ; Engineering, Mechanical
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Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang 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.
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