Title : Effect of biodiesel blended DME fuel on spray and emission characteristics in a light duty diesel engine

Authors : Donggon Lee, Kyusoo Jeong, Jeong Hwan Park, Hyun Gu Roh, Sungwook Park,

             Chang Sik Lee

Speaker : Donggon Lee (ph D. course)

Abstract : This study describes effects of biodiesel DME fuel on the spray, combustion and emission characteristics. In the present work, the spray visualization system is used to investigate spray characteristics, such as spray cone angle and spray tip penetration. In addition, the combustion and emission characteristics were experimentally observed by using a modified four-cylinder light duty diesel engine with common-rail injection system.

  The spray results showed that spray cone angle of biodiesel blended DME fuel was wider than that of ULSD, and the spray tip penetration was shorter than that of ULSD. In combustion and emission characteristics, the ignition delay of biodiesel blended DME fuel was decreased, however, the indicated specific fuel consumption (ISFC) was increased compared to that of ULSD. Furthermore, biodiesel blended DME fuel led to decrease indicated specific carbon monoxide (IS-CO), indicated specific unburned hydrocarbon (IS-HC), and indicated specific soot (IS-soot) emissions. On the other hand, indicated specific nitrogen oxide (IS-NOx) emissions were increased slightly.

Keywords : Dimethyl ether (DME), Spray characteristics, Combustion characteristics, Exhaust emissions