Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on the Spray and Combustion Characteristics of Diesel-ethanol-biodiesel Blended Fuels in a Diesel Engine

디젤엔진에서 디젤-에탄올-바이오디젤 혼합연료의 분무 및 연소 특성에 관한 연구

  • Park, Su-Han (Department of Mechanical Engineering, Graduate School of Hanyang University) ;
  • Youn, In-Mo (Department of Mechanical Engineering, Graduate School of Hanyang University) ;
  • Lee, Chang-Sik (School of Mechanical Engineering, Hanyang University)
  • 박수한 (한양대학교 대학원 기계공학과) ;
  • 연인모 (한양대학교 대학원 기계공학과) ;
  • 이창식 (한양대학교 기계공학부)
  • Received : 2009.12.03
  • Accepted : 2010.03.23
  • Published : 2010.09.01
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Abstract

The aim of this study is to analyze the effect of the ethanol blending in diesel-ethanol blended fuels on the spray and combustion characteristics in a common-rail four-cylinder diesel engine. For the analysis of the spray characteristics, the spray images were obtained using a high speed camera with metal-halide lamps. From these spray images, the macroscopic spray characteristics such as the spray tip penetration and spray cone angle were investigated. Also, the combustion characteristics including the combustion pressure and the rate of heat release were studied with the analysis of the exhaust emissions in diesel-ethanol blended fuel driven diesel engine. It can be confirmed from the experiment on spray characteristics of diesel-ethanol blended fuels that the increased ethanol blending ratio induced the decrease of the spray tip penetration after the end of the injection. The spray cone angle slightly increased by the blending of ethanol fuel. In the experiment on atomization characteristics, the ethanol blending caused the improvement of the diesel atomization performance. On the other hand, at the same engine load condition, the increase of the ethanol blending ratio lead to lengthen the ignition delays, and to decrease the peak combustion pressure and the rate of heat release. Totally, the combustion and emission characteristics of ULSD and DE10 showed similar characteristics. However, in the case of DE20, CO and HC rapidly increased, and $NO_x$ decreased. It can be believed that 20% ethanol disturbed the combustion of diesel-ethanol blended fuel due to the low cetane number and evaporation.

Keywords

References

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