A Study of Flame Observables in Premixed Methane - Air Flames

  • Najm H
  • Knio O
  • Paul P
 et al. 
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Abstract

The use of particular experimental flame observables as dame markers,
and as measures of dame burning and heat release rates requires the
establishment of robust correlations between the particular observable
and the rate in question. In this work, we use a compilation of results
from numerical computations of the interaction of a premixed methane
dame with a two-dimensional counter-rotating vortex pair using detailed
kinetics. The data set involves the use of two different chemical
mechanisms, a two-fold Variation in flow time scales, and the
examination of both stoichiometric and rich methane dames. Correlations
between a number of dame observables and heat release and burning rates
are examined. We study HCO, del.v, OH, CH, CO, CH3, CH2O, CH2{*}, and
C2H2, as well as various concentration products (surrogates for
production rates) including {[}OH]{[}CH2O], {[}OH]{[}CH4], and
{[}OH]{[}CO]. Other concentration products expected to relate to
chemiluminescent observables such as CH{*}, OH{*} and CO2{*} are also
studied. HCO mole fraction is found to have the best correlation with
flame burning and heat release rates for all cases studied. Results
suggest that significant scatter due to flow unsteadiness is expected
from correlations of peak del.v, CO mole fraction gradient, C2H2 mole
fraction, and CH{*} with heat release. Changes in stoichiometry are
found to adversely affect the correlation expected from peak CO, OH, OH
gradient, CH, CH3, and {[}OH]{[}CH2O]. Little scatter is observed in the
{[}OH]{[}CH2O] data, highlighting its utility in the absence of
significant variation of reactants composition. We observe evidence of
useful correlations of peak {[}OH]{[}CH4] and {[}OH]{[}CO].
Concentration products of the precursors of OH{*} and CO2{*} are also
found to correlate well with peak heat release rate. Peak CH2O data is
found to have good correlation with peak burning and heat release rates,
with small scatter, and little correlation shift due to changes in
reactants composition.

Author-supplied keywords

  • Flame
  • HCO
  • Heat release
  • Methane
  • Observables
  • Premixed

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