On use of OH∗ and CO2∗ chemiluminescence for heat release rate measurement in diluted flames

J. A. Ranalli, D. Ferguson, J. Escobar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Chemiluminescence emission of the OH∗ radical is commonly used as an indicator of heat release rate in combustion measurements. In the presence of dilution, an environment of interest for exhaust gas recirculation applications, these diagnostics may be affected due to impacts on the chemical processes leading to these radicals. The present work was conducted as an initial test for the validity of OH∗chemiluminescence as a heat release rate indicator in the presence of dilution by nitrogen and carbon dioxide. Measurements of OH∗ and CO2∗ chemiluminescence were made in a turbulent premixed combustor, with varying levels of diluent. Both species reflect the commonly reported linear relationship between fuel flow rate and emitted intensity. CO2∗ chemiluminescence exhibited a correlation with temperature for nitrogen dilution, but exhibited significant increases in intensity with carbon dioxide dilution at high flame temperatures. This is possibly due to the higher CO concentrations found with increased CO2 dilution, which may increase the rate of the overall chemiluminescent reaction. When corrected for the CO2∗ baseline, OH∗ chemiluminescence intensity exhibited a correspondence in intensity to the flame temperature for both diluents. When appropriate care is taken to account for these effects, OH∗ and CO2∗ chemiluminescence appear to be suitable indicators of flame heat release rate.

Original languageEnglish (US)
Title of host publicationFall Meeting of the Eastern States Section of the Combustion Institute 2009
PublisherCombustion Institute
Pages497-503
Number of pages7
ISBN (Electronic)9781615676682
StatePublished - Jan 1 2009
EventFall Meeting of the Eastern States Section of the Combustion Institute 2009 - College Park, United States
Duration: Oct 18 2009Oct 21 2009

Publication series

NameFall Meeting of the Eastern States Section of the Combustion Institute 2009

Other

OtherFall Meeting of the Eastern States Section of the Combustion Institute 2009
CountryUnited States
CityCollege Park
Period10/18/0910/21/09

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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    Ranalli, J. A., Ferguson, D., & Escobar, J. (2009). On use of OH∗ and CO2∗ chemiluminescence for heat release rate measurement in diluted flames. In Fall Meeting of the Eastern States Section of the Combustion Institute 2009 (pp. 497-503). (Fall Meeting of the Eastern States Section of the Combustion Institute 2009). Combustion Institute.