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Effect of Additive on the Performance, Emission and Combustion Characteristics of a Diesel Engine Run by Diesel-Papaya Methyl Ester Blends

Chockalingam Sundar Raj and Muthukumarasamy Karthikayan

In this investigation, the effect of Di-tert butyl peroxide (DTBP) as additive on the performance, exhaust emissions and combustion characteristics of a single cylinder direct injection compression ignition engine fuelled with papaya seed oil methyl ester (PSME) has been studied. Base data was generated on a 5.2 kW single-cylinder diesel engine with standard diesel fuel. PSME-diesel blends ranging from 25% to 100% of PSME with diesel fuel by volume were prepared and tested in the diesel engine without and with the addition of DTBP. Improved performance reduced NOx emissions with slight increase in smoke density and HC emissions were observed for PSME blends with additive than those for PSME blends without additive. Earlier heat release and increase in cylinder pressure were also observed for blends with additive.