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Two rich premixed ethylene/oxygen/argon and ethylene/dimethoxymethane/oxygen/argon flat flames burning at 50 mbar were investigatedexperimentally by using molecular beam mass spectrometry to study the effect of methylal (dimethoxymethane) addition on speciesconcentration profiles (C. Renard, P.J. Van Tiggelen and J. Vandooren, Proc. Combust. Inst.,  29  (2002) 1277–1284). The replacement of 5.7% C 2 H 4  by 4.3% C 3 H 8 O 2 , keeping the equivalence ratio equal to 2.50, is responsible for a decrease of the maximum mole fractions of most of thedetected intermediate species. If this phenomenon is barely noticeable for C 2  to C 4  intermediates, it becomes more efficient for C 5  to C 10  species. Previously, a reaction mechanism has been validated against a premixed rich C 2 H 4 /O 2 /Ar flame (φ = 2.50) which describes in detail the formation of soot precursors and more precisely the main pathways involvingbenzene (V. Dias, C. Renard, P.J. Van Tiggelen and J. Vandooren, European Combustion Meeting, Orléans, France, p.221, 2003).The aim of this work is to extend this original model by building a sub-mechanism taking into account the formation and theconsumption of oxygenated species involved in dimethoxymethane combustion. The new mechanism contains 474 elementary reactionsand involves 90 chemical species in order to simulate both ethylene flames with and without methylal addition. The model leadsto a good simulation for all species detected in these flames, and underlines the effect of methylal addition on species concentrationprofiles.According to this mechanism, the two main degradation pathways of methylal (CH 3 OCH 2 OCH 3 ) in C 2 H 4 /methylal/oxygen/argon flame are:

Modeling of Rich Premixed C 2 H 4 /O 2 /Ar and C 2 H 4 /Dimethoxymethane/O 2 /Ar Flames