Effect of oxygen enrichment and CO2 dilution on laminar methane flame velocities

International audienceThis study presents the effect of oxygen enrichment and CO2 dilution on laminar methane flame velocity. Experiments were carried out in a stainless steel combustion chamber at atmospheric pressure and 300 K. The methane was mixed with a mixture of O2, CO2 and N2. The ratio O2/(O2+N2) was varied from 21% to 100% and the volume fraction of CO2 in the mixture was varied from 0% to 40%, for an equivalence ratio of 0.7. The classical shadowgraphy technique was used to detect the reaction zone to deduce the un-stretched burning velocity, from the nonlinear methodology. Laminar flame velocities were deduced from this analysis. Laminar flame velocities were also calculated and compared to experiments