Absolute radical concentration measurements in low-pressure H2/O2 flames during the combustion of graphite

T. Bohm*, N. Ditzian, G. Peiter, H. R. Volpp, S. Cheskis, J. Wolfrum

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Absolute CN and CH radical concentrations were determined in situ during the combustion of a graphite substrate in premixed, laminar, low-pressure, H2/O2 flames for two different equivalence ratios, φ = 1 and φ = 1.5. For CN measurements, a small amount of NO (1.8%) was added. The graphite substrate reduced the flame temperature in the vicinity of its surface. The CN concentrations were three times higher for the rich flame than for the stoichiometric flame. CH concentrations were slightly higher for the stoichiometric flame than for the rich flame. The observed CH/CN concentration ratio was substantially lower compared to NO-doped low-pressure CH4/O2 flames. The obtained quantitative information could serve as a first calibration point for detailed numerical simulations of the burning solid graphite, which are based on the concept of surface elementary reactions. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).

Original languageEnglish
Pages (from-to)2131-2139
Number of pages9
JournalProceedings of the Combustion Institute
Volume30 II
Issue number2
DOIs
StatePublished - 2005
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: 25 Jul 200430 Jul 2004

Keywords

  • Diagnostic methods: spectroscopic, laser
  • Flames: laminar, premixed
  • Heterogeneous combustion

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