Numerical Study of Laminar Flame Velocity of Hydrogen-Enriched Methane Flames Using Several Detailed Reaction Mechanisms

The focus of this research work is to investigate the effect of adding hydrogen on the laminar speed of hydrogen-enriched methane flame. The laminar velocities of methane-hydrogen-air mixtures are very important in designing and predicting the progress of combustion and performance of H-2-fueled combustion devices. In this study, laminar flame velocities of various compositions of CH4-H-2-air mixtures (from 0 to 100% hydrogen) have been calculated for different equivalence ratios (ranging from 0.6 to 1.4) and using several detailed reaction mechanisms. Simulations were carried out using the flame speed calculation (FSC) model of the chemical kinetics code Chemkin 4.02. The results of this study were compared with many measurements data of laminar flame speed from the literature, and good agreements were obtained for the whole range of hydrogen blends and equivalence ratios, especially with the detailed reaction mechanism GRIMech 3.0. This research demonstrates that the laminar burning velocity of methane flame was enhanced by the addition of hydrogen.