Combustion and particulate emission characteristics of a diesel engine fuelled with diesel

Abstract

The effect of fuel constituents on the combustion and particle emission characteristics of a compression ignition engine fuelled with diesel—dimethoxymethane (DMM) blends is investigated experimentally. Four engine loads at the maximum torque engine speed of 1600r/min and rated engine speed of 2200r/min were carried out respectively. Three diesel—DMM blended fuels containing 15 vol %, 30 vol %, and 50 vol % DMM, corresponding to 6.35 mass %, 12.67 mass %, and 21.11 mass % oxygen in the blends were used. The study showed that the ignition delay experienced a slight increase while the rapid combustion duration and the total combustion duration decreased with increase in the DMM fraction in the fuel blends. The maximum cylinder pressure, the maximum rate of pressure rise, and the maximum rate of heat release increase with the addition of DMM to the blended fuels. Moreover, the smoke concentration decreases with increase in the oxygen mass fraction in the blends and the reduction rate reaches 80 per cent for 50 vol % DMM in the blend under a high engine load. The influence of DMM on the nanoparticulate distribution was also studied in the tests and it was found that the total number of nanosized particulates are all reduced with increase in the oxygen content in the blends.

Keywords

combustion dimethoxymethane nanoparticulate distribution emission

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Combustion and particulate emission characteristics of a diesel engine fuelled with diesel—dimethoxymethane blends

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