Structural effects of C3 oxygenated fuels on soot formation in ethylene coflow diffusion flames

This paper investigates how the structure of three C3 oxygenated fuels: dimethyl carbonate (DMC), dimethoxymethane (DMM) and isopropanol (IPA) influences soot formation when fuels are blended with ethylene in laminar coflow diffusion flames. Up to 20% total carbon was substituted fuel. Colour-ratio pyrometry used measure volume fraction (fv). IPA caused a strong increase fv, whereas DMM DMC both an initial followed by progressive decrease fv as proportion fuel increased. Differential mobility spectrometry thermocouple probes were particle size distribution gas temperature flames at 5% blend strength. The hottest region consistently about 100 K cooler than corresponding flame, indicating thermal effect doping. showed maximum centre-line average versus showing largest increase. evolution distributions that experienced earlier growth compared flame. Consideration role chemical pathways towards benzene suggests methyl radicals from decomposition responsible for difference between is thought be due additional presence species originating carbon-carbon bonded backbone IPA. Meanwhile, differences arise CO2 produced during DMC, where pyrolysis flame observed 50 other