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

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

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

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

School of Chemistry

Research output: Contribution to conference › Paper › peer-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 (l.8 %) was added. The CN concentrations were three times higher for the rich flame than to 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 can 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.

Original language	English
Pages	57
Number of pages	1
State	Published - 2004
Event	30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, United States Duration: 25 Jul 2004 → 30 Jul 2004

Conference

Conference	30th International Symposium on Combustion, Abstracts of Symposium Papers
Country/Territory	United States
City	Chicago, IL
Period	25/07/04 → 30/07/04

Cite this

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

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 (l.8 %) was added. The CN concentrations were three times higher for the rich flame than to 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 can 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.",

author = "T. Bohm and G. Peiter and Volpp, {H. R.} and J. Wolfrum and N. Ditzian and S. Cheskis",

note = "Funding Information: This research was supported by the Israel Science Foundation (Grant No. 574/00) and by the James Franck, German-Israeli Binational Program in Laser Matter Interaction, and the Deutsche Forschungsgemeinschaft (SFB 606). ; null ; Conference date: 25-07-2004 Through 30-07-2004",

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TY - CONF

T1 - Absolute radical concentration measurements in low-pressure H2/O2 flames during the combustion of graphite

AU - Bohm, T.

AU - Peiter, G.

AU - Volpp, H. R.

AU - Wolfrum, J.

AU - Ditzian, N.

AU - Cheskis, S.

N1 - Funding Information: This research was supported by the Israel Science Foundation (Grant No. 574/00) and by the James Franck, German-Israeli Binational Program in Laser Matter Interaction, and the Deutsche Forschungsgemeinschaft (SFB 606).

PY - 2004

Y1 - 2004

N2 - 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 (l.8 %) was added. The CN concentrations were three times higher for the rich flame than to 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 can 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.

AB - 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 (l.8 %) was added. The CN concentrations were three times higher for the rich flame than to 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 can 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.

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Y2 - 25 July 2004 through 30 July 2004

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

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