Study of reaction rates through a local extinction point in nonpremixed flames

William F. Carnell, Michael W. Renfro

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A laminar co-annular counterflow flame is used to generate a stable local extinction point in a nonpremixed flame sheet. Measurements of hydroxyl planar laser-induced fluorescence (PLIF) and formaldehyde PLIF were made through the local extinction point and were used to estimate the OH+CH2O forward reaction rate. In addition, two-dimensional numerical simulations of the flame and extinction point were completed using a comprehensive chemical kinetic model. Since the local temperature at the extinction point decreases strongly, the measured PLIF profiles include significant dependence on Boltzmann fraction, particularly for CH2O. The simulated species concentrations were modified to include the temperaturedependent variations that could not be removed from the measurements. The simulated and measured profile shapes are in good agreement, but the simulations show a stronger quantitative increase in the OH+CH2O reaction prior to extinction and a thinner reaction rate at the centerline than observed in the measurements. In addition to the direct comparison of OH+CH2O reactions, the simulations are used to examine other important reactions at the extinction point.

Original languageEnglish
Title of host publicationFall Technical Meeting of the Eastern States Section of the Combustion Institute 2007 "Chemical and Physical Processes in Combustion"
Pages266-272
Number of pages7
ISBN (Electronic)9781604239454
StatePublished - 2007
EventFall Technical Meeting of the Eastern States Section of the Combustion Institute 2007: Chemical and Physical Processes in Combustion - Charlottesville, United States
Duration: Oct 21 2007Oct 24 2007

Publication series

NameFall Technical Meeting of the Eastern States Section of the Combustion Institute 2007 "Chemical and Physical Processes in Combustion"

Conference

ConferenceFall Technical Meeting of the Eastern States Section of the Combustion Institute 2007: Chemical and Physical Processes in Combustion
Country/TerritoryUnited States
CityCharlottesville
Period10/21/0710/24/07

ASJC Scopus subject areas

  • General Chemical Engineering
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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