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The chemical effect of CO2 replacement of N2 in air on the burning velocity and structure of methane premixed flames

From National Research Council Canada

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Affiliation
  1. National Research Council of Canada. NRC Institute for Chemical Process and Environmental Technology
SponsorSearch for: The Combustion Institute
FormatText, Article
ConferenceCanadian Section, 2002 Spring Technical Meeting : Windsor, ON, May 2002
SubjectCO2 replacement; freely-propagating planar flames; CH4/O2/N2/CO2 flames; adiabatic flame; burning velocity
Abstract
A numerical study was conducted to investigate the chemical effect of CO2 replacement of N2 in air on the burning velocity and structure of freely-propagating planar CH4/O2/N2/CO2 flames at atmospheric pressure. Detailed chemistry and complex thermal and transport properties were employed in the calculations. The chemical effect of CO2 was numerically separated from its effects of thermal and transport properties using the strategy developed previously by the authors. Numerical results indicate that the chemical effect of CO2 significantly reduces the burning velocity of CH4/O2/N2/CO2 flames. While the chemical effect of CO2 slightly lowers the mixture adiabatic flame temperature, the significant reduction of the burning velocity by the chemical effect of CO2 is primarily a direct consequence of the reduced temperature gradiant across the reaction zone. The three major reaction pathways of the chemical effect of CO2 were found to be (equation). The presence of CO2 in the fresh mixture plays a chemically inhibiting role through its competition for H radicals with (equation) leading to reduction of the chain branching rate
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LanguageEnglish
Peer reviewedYes
NRC numberNRCC 51484
NPARC number5082807
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Record identifier9cf9be85-9300-4570-b70a-f73a355a2259
Record created2009-12-11
Record modified2020-03-30
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