Experimental investigation on injection characteristics of rapeseed oil as fuel for diesel engines

Abstract

Complete fuel combustion is highly dependent on the quality of fuel atomization and distribution in the combustion chamber. The main purpose of the research was experimental investigation of injection characteristics of rapeseed oil and its various blends with mineral diesel fuel. The attention was focused on the injection characteristics, which significantly influence the characteristics of the engine performance and exhaust emissions. The following parameters of the injection characteristics have been investigated experimentally: sound velocity in fuel, maximum injection pressure, injection duration and spray characteristics. The experimental investigation results indicate that differences in the physical properties of diesel fuel and rapeseed oil have significant influence on the injection characteristics. The increase of rapeseed oil amount causes sound velocity in fuel to increase, that leads to advanced injection timing. It was determined that rapeseed oil affects the increase of the maximum injection pressure and injection duration. The comparison of rapeseed oil and mineral diesel fuel sprays development shows that when injecting identical fuel quantity diesel sprays were longer than that of the rapeseed oil.