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A Numerical Study on the Effect of Water Addition on NO Formation in Counterflow CH4/Air Premixed Flames

[+] Author Affiliations
Hongsheng Guo, Stuart W. Neill, Gregory J. Smallwood

National Research Council of Canada, Ottawa, ON, Canada

Paper No. ICEF2005-1299, pp. 383-391; 9 pages
doi:10.1115/ICEF2005-1299
From:
  • ASME 2005 Internal Combustion Engine Division Fall Technical Conference
  • ASME 2005 Internal Combustion Engine Division Fall Technical Conference (ICEF2005)
  • Ottawa, Ontario, Canada, September 11–14, 2005
  • Conference Sponsors: Internal Combustion Engine Division
  • ISBN: 0-7918-4736-5 | eISBN: 0-7918-3768-8
  • Copyright © 2005 by National Research Council of Canada

abstract

The effect of water addition on NO formation in counterflow CH4 /air premixed flames was investigated by numerical simulation. Detailed chemistry and complex thermal and transport properties were employed. The results show that the addition of water to a flame suppresses the formation of NO primarily due to the flame temperature drop. Among a lean, a stoichiometric and a rich premixed flame, the effectiveness of water addition is most significant for the stoichiometric flame and least for the rich flame, since the dominant NO formation mechanism varies. The addition of water also reduces the formation of NO in a flame because of chemical effect that increases the concentration of OH, while reduces the concentrations of O and H. Compared to the stoichiometric flame, the chemical effect is intensified in the lean and rich flames.

Copyright © 2005 by National Research Council of Canada
Topics: Flames , Methane , Water

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