Burning rates and surface characteristics of hydrogen-enriched turbulent lean premixed methane-air flames

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DOIResolve DOI: http://doi.org/10.1115/HT2009-88268
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TypeArticle
Proceedings titleProceedings of the ASME Summer Heat Transfer Conference 2009
Conference2009 ASME Heat Transfer Summer Conference, July 19-23, 2009, San Francisco, California, USA
ISBN978-0-7918-4358-1
978-0-7918-3851-8
Volume3
Article numberHT2009-88268
Pages97103; # of pages: 7
SubjectHydrogen enrichment; Turbulent premixed flame; Burning velocity; Preferential diffusion
AbstractThe burning rates and surface characteristics of hydrogen-enriched turbulent lean premixed methane-air flames were experimentally studied by laser tomography visualization method using a V-shaped flame configuration. Turbulent burning velocities were measured and the variation of flame surface characteristics due to hydrogen addition was analyzed. The results show that hydrogen addition causes an increase in turbulent burning velocity for lean CH4 -air mixtures when the turbulent level in the unburned mixture is not changed. The increase rate of turbulent burning velocity is higher than that of the corresponding laminar burning velocity, suggesting that the increase in turbulent velocity due to hydrogen addition is caused by not only chemical kinetics effect, but also the variation in flame structure due to turbulence. The further analysis of flame surface characteristics and brush thickness indicate that hydrogen addition slightly decreases local flame surface density, but increases total flame surface area because of the increased flame brush thickness. As a result, turbulent burning velocity is intensified by the increase in total flame surface area and the increased laminar burning velocity, when hydrogen is added.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52003
NPARC number15093660
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Record identifiera13def97-523d-459a-b1c7-fa734ba1e0a5
Record created2010-04-27
Record modified2016-05-09
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