期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 38, 期 3, 页码 1636-1643出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.11.023
关键词
Laminar flame speed; Flame structure; OH-PLIF measurement; Spectrograph; Composition; Syngas
资金
- National Natural Science Foundation of China [51136005, 51121092]
- State Key Laboratory of Engines of Tianjin University [SKLE201101]
- Ministry of Education of China [20110201120045]
- Fundamental Research Funds for the Central Universities
- EPSRC [EP/G063044/1]
- Engineering and Physical Sciences Research Council [EP/G063044/1] Funding Source: researchfish
- EPSRC [EP/G063044/1] Funding Source: UKRI
Various Bunsen flame information of premixed syngas/air mixtures was systematically collected. A CCD camera was used to capture the flame images. The OH-PLIF technique was applied to obtain the flame OH distribution and overall flame radiation spectra were measured with a spectrograph. Experiments were conducted on a temperature uncontrolled burner and syngas over a wide range of H-2/CO ratios (from 0.25 to 4) and equivalence ratios (from 0.5 to 1.2). Results show that increasing hydrogen fraction (X-H2) extends the blow-off limit significantly. The measured laminar flame speed using cone-angle method based on CCD flame imaging and OH-PLIF images increases remarkably with the increase of X-H2, and these measurements agrees well with kinetic modeling predictions through Li's mechanism when the temperature for computation is corrected. Kinetic study shows that as X-H2, increases, the production of H and OH radicals is accelerated. Additionally, the main H radical production reaction (or OH radical consumption reactions) changes from R29 (CO + OH = CO2 + H) to R3 (H-2 + OH = H2O + H) as X-H2 increases. Sensitivity analysis was conducted to access the dominant reactions when X-H2 increases. The difference on flame color for different X-H2 mixtures is due to their difference in radiation spectrum of the intermediate radicals produced in combustion. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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