Journal
FUEL
Volume 90, Issue 2, Pages 748-755Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2010.08.029
Keywords
Ethanol blended diesel fuel; Exhaust emissions; Spray tip penetration; Injection timing
Categories
Funding
- CEFV (Center for Environmentally Friendly Vehicle) of the Eco-STAR of the MOE (Ministry of the Environment in Seoul, Republic of Korea)
- Brain Korea 21 Project
- manpower development program for Energy Resources
- Ministry of Knowledge and Economy (MKE) [10033863-2009-11]
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The aim of this work is to investigate the effect of ethanol blending to diesel fuel on the combustion and exhaust emission characteristics of a four-cylinder diesel engine with a common-rail injection system. The overall spray characteristics, such as the spray tip penetration and the spray cone angle, were studied with respect to the ethanol blending ratio. A spray visualization system and a four-cylinder diesel engine equipped with a combustion and emission analyzer were utilized so as to analyze the spray and exhaust emission characteristics of the ethanol blending diesel fuel. Ethanol blended diesel fuel has a shorter spray tip penetration when compared to pure diesel fuel. In addition, the spray cone angle of ethanol blended fuels is larger. It is believed that the lower fuel density of ethanol blended fuels affects the spray characteristics. When the ethanol blended fuels are injected around top dead center (TDC), they exhibit unstable ignition characteristics because the higher ethanol blending ratio causes a long ignition delay. An advance in the injection timing also induces an increase in the combustion pressure due to the sufficient premixed duration. In a four-cylinder diesel engine, an increase in the ethanol blending ratio leads to a decrease in NOx emissions due to the high heat of evaporation of ethanol fuel, however, CO and HC emissions increase. In addition, the CO and HC emissions exhibit a decreasing trend according to an increase in the engine load and an advance in the injection timing. (C) 2010 Elsevier Ltd. All rights reserved.
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