Title : Injection spray and emissions characteristics in a diesel engine using diesel-bioethanol blended fuel

Authors : K. Jeong, S. H. Park, and C. S. Lee

Speaker : S. H. Park (Ph.D)

Abstract

The aim of this study is to investigate the effects of engine load on the fuel spray, combustion, and exhaust emis-sions characteristics of ethanol blended diesel fuel (E-diesel fuel) in a four-cylinder automotive diesel engine. In this study, macroscopic spray characteristics and injection performance of E-diesel fuel were investigated and analyzed by using the injection rate measuring system and the spray visualization system. Also, the combustion pressure, heat release, and emissions characteristics of E-diesel fuel were measured and analyzed under various engine loads and test conditions. It was revealed that E-diesel fuels were consumed more in the same engine load conditions than a pure diesel fueled engine, due to the lower heating value. At the region after the end of the in-jection, the increase of the engine load caused the increase of spray macroscopic characteristics, such as spray tip penetration and the spray cone angle of E-diesel fuels, as well as pure diesel fuel. The increase of the engine load led to the decrease of the ignition delay, due to the high gas temperature in the combustion chamber. The blend-ing of ethanol fuel caused the extension of the ignition delay; however, there was little difference in the maximum combustion pressure at medium and high engine load conditions. The increase of the ethanol blending ratio caused the decrease of NOx emissions and the increase of HC and CO emissions