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1 Archivum Combustionis

1 2002

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Measurement of adiabatic burning velocity and sampling in methane-oxygen-carbon dioxide mixtures

Konnov A. A., Dyakov I. V., De Ruyck J.

Archivum Combustionis

2002

Vol. 22 nr 1-2

13-24

Experimental measurements of the adiabatic burning velocity and major products formation in methane - oxygen - carbon dioxide mixtures are presented. The oxygen contents O2/(O2+CO2) in the artificial air was varied from 26 to 35 %. Non-stretched flames were stabilized on a perforated plate burner at 1 atm. A Heat Flux method was used to determine burning velocities under conditions when the net heat loss of the flame is zero. An overall accuracy of the burning velocities was estimated to be better than +- 0,8 cm/s. Experimental results agree well with detailed chemical model predictions. Probe sampling measurements of the concentrations of O2 and CO in the post-flame zone of the methane - oxygen - carbon dioxide flames are reported. Axial profiles of the concentrations of stable species in the post-flame zone were used to evaluate the influence of the ambient air entainment, flame expansion and downstream heat losses. In the very lean mixtures an ambient air dilutes the butnt gases, while in the very rich mixtures it causes oxidation of the combustion products. The numerical predictions of the concentrations of O3, CO2 and CO in the post-flame zone are in a good agreement with the experiment when downstream heat losses to the environment are taken into account.