Performance and Emission Characteristics of Dual-fuel(Diesel-CNG) Combustion in a Diesel Engine

Abstract : This paper describes an investigation of the performance and emission characteristics of a commercial cylinder direct injection diesel engine operating on natural gas with pilot diesel ignition. Engine tests for variations in the pilot injection timing were performed at an engine speed of 1500 rpm. This study showed that the performance of the dual-fuel diesel engine increased as the engine load increased and as the pilot diesel injection timing angle advanced. The peaks of cylinder pressure, pressure rise rate, and heat release rate all increased while the fuel ignition timing advanced with the pilot injection timing. The engine operation was stable, and the least smoke was produced at a pilot injection timing of 12° before top dead center. NOx emissions were only exhausted under high-load conditions, and they increased as the pilot injection timing angle advanced. Key words : Diesel engine(디젤기관), Dual fuel combustion(혼소), CNG(압축천연가스), Smoke(매연), NOx(질소산화물) Nomenclature 1)