Abstract
The addition of dimethoxymethane (DMM or methylal) and diethoxymethane (DEM or ethylal) to a rich ethylene/oxygen/argon flame has been investigated by measuring the depletion of soot precursors. Three rich premixed ethylene/oxygen/argon (with and without added methylal or ethylal) flat flames have been stabilized at low-pressure (50 mbar) on a Spalding–Botha type burner with the same equivalence ratio of 2.50. Identification and monitoring of signal intensity profiles of species within the flames have been carried out by using molecular beam mass spectrometry (M.B.M.S.). The replacement of some C 2H 4 by C 3H 8O 2 or C 5H 12O 2 is responsible for a decrease of the maximum mole fractions of the detected intermediate species. This phenomenon is noticeable for C 2–C 4 intermediates and becomes more effective for C 5–C 10 species, mainly when C 3H 8O 2 added. A new kinetic model has been elaborated and contains 546 reactions and 107 chemical species in order to simulate the three investigated flames: C 2H 4/O 2/Ar, C 2H 4/DMM/O 2/Ar and C 2H 4/DEM/O 2/Ar. The reaction mechanism well reproduces experimental mole fraction profiles of major and intermediate species, and underlines the effect of methylal and ethylal addition on species concentration profiles for these flames.
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