Performance and Emission Characteristics of Diesel Engines Fueled by Rapeseed Oil-Gas Oil Blends.

Abstract

Many studies of diesel engine operation by vegetable oils have been carried out as vegetable oils are renewable and offer reductions in carbon dioxide emissions. This paper investigates gas oil blended with rapeseed oil as a diesel fuel substitute. Prior to the engine experiments, the evaporation behavior of the blended fuel was examined with single droplet evaporation on a hot plate, and the spray characteristics such as spray angle and penetration are discuseed using spray images in photos taken with single injections into air at high pressure and room temperature (1.57 MPa and 298 K). The performance and emissions of two types of small single cylinder DI diesel engines (engine A equipped with a bowl in piston type combustion chamber and a throttle nozzle, and engine B a toronidal type with a multi hole nozzle of 4-φ 0.2) were also examined. As a result, the blended fuels with equal proportions of gas oil and rapeseed oil or higher gas oil ratios showed good engine performance and emission characteristics, like those of gas oil operation.