Reaction kinetics of hydrogen-enriched methaneair and propaneair flames

A computer program has been developed to calculate the burning velocity and intricate paths of hydrogen-enriched propaneair and hydrogen-enriched methaneair flames. A comprehensive reaction scheme and a rigorous method for the estimation of the transport coefficients have been adopted. The model predictions were examined against experimental results of other investigators, and good agreement has been generally found for a wide range of initial conditions. These include 80 KPa < P < 2 MPa, 280 K < T < 650 K, 0.4 < Φ < 1.5 and hydrogen to fuel molar ratio between 0 and ∞. The major chemical reaction channels by which these mixtures are burned have been analyzed by using the time-dependent kinetic flow charts technique. A possible explanation, which is based on the shortage of H atoms approach, for the complex behavior of the burning velocity of H₂-enriched CH₄air and C₃H₈air flames along an unburned gas isentrope as observed by Milton and Keck, has been proposed.