Abstract
In the present research a series of investigations have been performed for an improvement of the chemical reaction mechanisms of methane in the oxygen-enriched condition. Among the representative combustion characteristics, the burning velocity was selected as a reference for the improvement. The burning velocities of methane/air and methane/oxygen-enriched flame according to various equivalence ratios were determined by an analysis of the Schlieren images. The propriety of present experimental data was inspected by comparison with other experimental results. Based on the experimental burning velocity data, performance of the existing reaction mechanisms was assessed for the prediction of burning velocity. Also from the sensitivity analysis a modified GRI 3.0 reaction mechanism was suggested, in which the reaction rate coefficients of (R38) H + O2 ↔ O + OH in GRI 3.0 reaction mechanisms were corrected. Modified reaction mechanisms showed a good agreement for predicting the burning velocity and number density of NO in methane/oxygenenriched flame as well as methane/air flame.
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