Header menu link for other important links
X
Numerical study of structures of laminar opposed flow premixed methane-hydrogenair flames at lowstrain rate
R. Sreenivasan,
Published in
2011
Volume: 3
   
Issue: 5
Pages: 359 - 373
Abstract
Numerical investigation of laminar counterflow premixed methane-hydrogen-air flames at a low strain rate is presented. Simulations are carried out with a numerical model incorporated with C2 chemical mechanism having 25 species and 121 reaction steps, and with an optically thin radiation submodel. The numerical model is validated using the experimental data reported in the literature in terms of temperature and species concentrations in flames from opposed flow premixed methane-air and hydrogen-air streams. Parametric studies are performed for opposed flowing methanehydrogen and air mixtures. A premixed methane-hydrogen and air with a rich mixture equivalence ratio (1.75) flows from the top duct, and one having a lean mixture equivalence ratio (0.25) flows from the bottom duct. The volumetric fraction of hydrogen in the fuel mixture has been varied from 20 to 80%. The strain rate used in the present study is kept constant at 50 s -1. Variation of velocity, temperature, species concentrations, and net reaction rates of oxygen, methane and hydrogen along the axis for various cases are presented and discussed in detail. Double flame zones are observed for all the cases. The addition of hydrogen to the rich side stream is seen to be effective in modifying the extents of both reaction zones. The reaction rate of methane is seen to be enhanced with the addition of hydrogen. © 2011 by Begell House, Inc.
About the journal
JournalComputational Thermal Sciences
ISSN19402503
Open AccessNo
Concepts (34)
  •  related image
    Air mixtures
  •  related image
    CHEMICAL MECHANISM
  •  related image
    DETAILED CHEMICAL KINETIC
  •  related image
    Equivalence ratios
  •  related image
    Experimental data
  •  related image
    Flame structure
  •  related image
    FLAME ZONES
  •  related image
    Fuel mixtures
  •  related image
    LAMINAR COUNTERFLOW
  •  related image
    Lean mixtures
  •  related image
    Low strain rates
  •  related image
    Methane-air
  •  related image
    Numerical investigations
  •  related image
    Numerical models
  •  related image
    Numerical studies
  •  related image
    OPPOSED FLOW
  •  related image
    OPPOSED FLOW FLAMES
  •  related image
    OPTICALLY THIN RADIATION MODEL
  •  related image
    Parametric study
  •  related image
    Premixed
  •  related image
    REACTION STEPS
  •  related image
    REACTION ZONES
  •  related image
    SIDE STREAMS
  •  related image
    SPECIES CONCENTRATION
  •  related image
    SUBMODELS
  •  related image
    VOLUMETRIC FRACTIONS
  •  related image
    Combustors
  •  related image
    Computer simulation
  •  related image
    Hydrogen
  •  related image
    Methane
  •  related image
    Mixtures
  •  related image
    Numerical methods
  •  related image
    Reaction rates
  •  related image
    Strain rate