Performance and Emission Analysis of the diesel engine with the modified piston run by Delonix regia oil

Mechanical engineering

ABSTRACT In this study, the performance and emission characteristics of a single cylinder diesel engine with the effect of piston bowl geometry [Hemispherical Cavity Piston (HCP) and Toroidal Cavity Piston (TCP)] using diesel and Delonix regia. Then its diesel blends have been mixed under different loading conditions. The Delonix regia oil is converted into Delonix regia by trans-esterification process and then used to prepare biodiesel/diesel blends. Then the base engine hemispherical cavity piston is machined to make toroidal type piston without affecting its cavity volume and without affecting the compression ratio of the engine. The blend used in this engine are Diesel,B25+75%diesel,B50+50%diesel,B75+25%diesel and B100. The results showed that the brake thermal efficiency of neat Delonix regia biodiesel and its blends for Toroidal Cavity Piston operation was increased and the CO, HC and smoke emissions were decreased at full load. The NOx emissions were slightly increased for Delonix regia seed oil and its diesel blends with toroidal piston operation compared with diesel fuel with HCP operation. KEYWORDS: Modified Piston, Delonix regia, Trans-esterification, Biodiesel

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