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Investigation of the structure of oxy-fuel flames using Raman laser diagnostics
Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Department of Energy and Process Engineering.
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
NTNU, 2012.
Doctoral theses at NTNU, ISSN 1503-8181 ; 2012:166
National Category
Machinery energy and environmental technology
URN: urn:nbn:no:ntnu:diva-20467ISBN: 978-82-471-3623-2, h.ISBN: 978-82-471-3624-9 (electronic)OAI: diva2:611392
Public defence
2012-09-26, 00:00

The smaller authors file is 23mb

Available from: 2013-03-15 Created: 2013-03-15 Last updated: 2013-05-02Bibliographically approved
List of papers
1. On the structure of the near field of oxy-fuel jet flames using Raman/Rayleigh laser diagnostics
Open this publication in new window or tab >>On the structure of the near field of oxy-fuel jet flames using Raman/Rayleigh laser diagnostics
2012 (English)In: Combustion and Flame, ISSN 0010-2180, E-ISSN 1556-2921, Vol. 159, no 11, 3342-3352 p.Article in journal (Refereed) Published
Abstract [en]

An experimental study on turbulent non-premixed jet flames is presented with focus on CO2-diluted oxy-fuel combustion using a coflow burner. Measurements of local temperatures and concentrations of the main species CO2, O-2, CO, N-2, CH4, H2O and H-2 were achieved using the simultaneous line-imaged Raman/Rayleigh laser diagnostics setup at Sandia National Laboratories. Two series of flames burning mixtures of methane and hydrogen were investigated. In the first series, the hydrogen molar fraction in the fuel was varied from 37% to 55%, with a constant jet exit Reynolds number Re-Fuel of 15,000. In the second series the jet exit Reynolds number was varied from 12,000 to 18,000, while keeping 55% H-2 molar fraction in the fuel. Besides local temperatures and concentrations, the results revealed insights on the behaviour of localized extinction in the near-field. It was observed that the degree of extinction increased as the hydrogen content in fuel was decreased and as the jet Reynolds number was increased. Based on the distribution of the temperature, a fully burning probability index able to quantify the degree of extinction along the streamwise coordinate was defined and applied to the present flame measurements. A comparison of measured conditional mean of mass fractions and laminar flame calculations underlined the significant level of differential diffusion in the near-field that tended to decrease farther downstream. The results also showed high local CO levels induced by the high content of CO2 in the oxidizer and flame products. A shift of maximum flame temperature was observed toward the rich side of the mixture fraction space, most likely as a consequence of reduced heat release in the presence of product dissociation. Main characteristics of laser Raman scattering measurements in CO2-diluted oxy-fuel conditions compared to air-diluted conditions are also highlighted. Most data, including scalar fluctuations and conditional statistics are available upon request. (C) 2012 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Oxy-fuel, Jet flame, CO2-diluted, Localized extinction, Raman, Differential diffusion
urn:nbn:no:ntnu:diva-20792 (URN)10.1016/j.combustflame.2012.06.017 (DOI)000309622900009 ()

“NOTICE: this is the author’s version of a work that was accepted for publication in <Journal title>. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Combustion and Flame, VOL 159, ISSUE 11,  DOI:10.1016/j.combustflame.2012.06.017

Available from: 2013-04-30 Created: 2013-04-30 Last updated: 2013-04-30Bibliographically approved

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