Adiabatic laminar burning velocities of C3H8-O2-CO2 and C3H8-O2-N2 mixtures at ambient conditions-PART I: Experimental and numerical study

This study and its companion paper presents a comprehensive study of laminar premixed flames of propane under oxy-fuel and oxygen-enrichment conditions for the first time. Laminar burning velocities were measured with the heat flux method at ambient conditions within an equivalence ratio of 0.6-1.6. The experimental results are discussed by comparison with modeling results from five detailed kinetic mechanisms. All models predicts the correct tendency of laminar burning velocities varies with equivalence ratios but only the UDEL model predicts the accurate laminar burning velocities under O-2-CO2 atmosphere. The laminar burning velocities of C3H8-air and C3H8 + 0.3O(2) + 0.7CO(2) were selected as reference values S-L0, a new correlation S-L/S-L0 = (1 + alpha Y-enr + beta Y-enr(2)) was obtained from the simulations and validated with experiment results. Good agreement between the correlation predictions and experimental results indicating that it is useful to predict S-L in the range of this work. Part II will discuss the global flame parameters and the mechanisms of dilution, thermal and chemical effects of diluents on the laminar burning velocities.