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An investigation of flame zones and burning velocities of laminar unconfined methane-oxygen premixed flames
Published in
2012
Volume: 16
   
Issue: 2
Pages: 199 - 219
Abstract
Numerical and experimental investigations of unconfined methane-oxygen laminar premixed flames are presented. In a lab-scale burner, premixed flame experiments have been conducted using pure methane and pure oxygen mixtures having different equivalence ratios. Digital photographs of the flames have been captured and the radial temperature profiles at different axial locations have been measured using a thermocouple. Numerical simulations have been carried out with a C2 chemical mechanism having 25 species and 121 reactions and with an optically thin radiation sub-model. The numerical results are validated against the experimental and numerical results for methane-air premixed flames reported in literature. Further, the numerical results are validated against the results from the present methane-oxygen flame experiments. Visible regions in digital flame photographs have been compared with OH isopleths predicted by the numerical model. Parametric studies have been carried out for a range of equivalence ratios, varying from 0.24 to 1.55. The contours of OH, temperature and mass fractions of product species such as CO, CO 2 and H 2O, are presented and discussed for various cases. By using the net methane consumption rate, an estimate of the laminar flame speed has been obtained as a function of equivalence ratio. © 2012 Taylor and Francis Group, LLC.
About the journal
JournalCombustion Theory and Modelling
ISSN13647830
Open AccessNo
Concepts (27)
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    Axial locations
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    Burning velocity
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    CHEMICAL MECHANISM
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    DETAILED CHEMICAL KINETIC
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    DIGITAL PHOTOGRAPHS
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    Equivalence ratios
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    Experimental investigations
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    FLAME ZONES
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    LAMINAR FLAME SPEED
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    LAMINAR PREMIXED FLAMES
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    MASS FRACTION
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    METHANE CONSUMPTION
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    METHANE-AIR PREMIXED FLAME
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    Numerical results
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    OPTICALLY THIN RADIATION MODEL
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    Parametric study
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    Premixed flame
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    PURE OXYGEN
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    Radial temperature profile
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    Visible region
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    Carbon dioxide
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    Experiments
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    Fuels
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    Oxygen
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    Photography
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    Thermocouples
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    Methane