Effects of fuel-air equivalence ratio, Temperature, and Inhibitor on the structure of Laminar Methane-air flames

Abstract

The mole fractions of the C¹-C³ hydrocarbons, CO, Co², N², and O² in laminar methane-air flames at one atmosphere pressure have been measured. The experiments wereperformed on a flat-flame burner as a function of fuel-air equivalence ratio, flame temperature, co-added ethylene or ethane fuel, and flame inhibitor. CF^aBr. Samples were obtained as a function of height above the burner surface using an uncooled quartz probe and were analyzed by gas chromatography. Measurements of the perturbation of the species mole fractions caused by the probe sampling technique were performed. Concentration-distance profiles have been obtained for five fuel-rich ((l)= 1.47-1.51) and one lcan ((l)=0.75) Rame. Product peak concentrations are compared with those from computer-modeled adiabatic flames, indicating the usefulness of the species profile data in testing kinetic mechanisms of methane combustion.