Study of the Soot Formation Process in a Flat Flame of Ethylene/Air with Various Dimethyl Ether Additives
A. V. Drakon, A. V. Eremin, R. N. Kolotushkin, E. Yu. Mikheeva, E. S. Khodyko
Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
Keywords: soot formation, soot particles, flat flame, LII, ethylene combustion, DME
Abstract
The article presents experimental and calculated results of a study of the formation and growth of soot particles in a standard ethylene/air flat flame with dimethyl ether (DME) additive. Two-dimensional laser-induced incandescence (2D-LII) was used as an experimental method, obtaining data on the volume fraction of soot particles in the flame. The time-resolved LII signal provided information on the average soot particle size depending on the flame height. Kinetic modeling was performed using a modern kinetic mechanism of hydrocarbon pyrolysis and oxidation, including a sectional model of soot particle growth. It was shown that DME additives lead to a decrease in soot yield without significantly affecting the final particle size. Furthermore, DME additives slow down the initial stages of soot particle formation but accelerate their subsequent growth.
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