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The structure of three laminar premixed rich flames has been investigated: apure methane flame and two methane flames doped by allene and propyne,respectively. The gases of the three flames contain 20.9% (molar) of methaneand 33.4% of oxygen, corresponding to an equivalence ratio of 1.25 for the puremethane flame. In both doped flames, 2.49% of C3H4 was added, corresponding toa ratio C3H4/CH4 of 12% and an equivalence ratio of 1.55. The three flames havebeen stabilized on a burner at a pressure of 6.7 kPa using argon as dilutant,with a gas velocity at the burner of 36 cm/s at 333 K. The concentrationprofiles of stable species were measured by gas chromatography after samplingwith a quartz microprobe. Quantified species included carbon monoxide anddioxide, methane, oxygen, hydrogen, ethane, ethylene, acetylene, propyne,allene, propene, propane, 1,2-butadiene, 1,3-butadiene, 1-butene, isobutene,1-butyne, vinylacetylene, and benzene. The temperature was measured using aPtRh (6%)-PtRh (30%) thermocouple settled inside the enclosure and ranged from700 K close to the burner up to 1850 K. In order to model these new results,some improvements have been made to a mechanism previously developed in ourlaboratory for the reactions of C3-C4 unsaturated hydrocarbons. The mainreaction pathways of consumption of allene and propyne and of formation of C6aromatic species have been derived from flow rate analyses.

Rich methane premixed laminar flames doped by light unsaturated hydrocarbons - Part I : allene and propyne