Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Comparison of Spray Characteristics according to Physical Properties of Ethanol/Gasoline Blended Fuel

에탄올/가솔린 혼합연료의 물리적 특성에 따른 분무 특성 비교

  • 김웅일 (한양대학교 기계설계공학과) ;
  • 김영근 (한양대학교 기계설계공학과) ;
  • 이황복 (현대자동차(주) 남양연구소) ;
  • 이기형 (한양대학교 기계설계공학과)
  • Received : 2017.03.08
  • Accepted : 2017.05.16
  • Published : 2017.09.30
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Abstract

The aim of this study is to investigate the effect of physical properties of fuels on spray characteristics in the gasoline direct injection system. Injection rate, spray visualization, and spray pattern experiments were performed to analyze the spray characteristics of ethanol, gasoline, and ethanol/gasoline blends. We measured injection rate of each fuel via the Bosch method. The spray visualization experiment was also carried out at atmospheric pressure using a high-speed camera. Finally, the average of drop surface area per unit volume was measured using the optical patternator. The experimental results from Bosch method showed that peak injection rate increased when the volume fraction of ethanol increased. In addition, higher viscosity of ethanol than that of gasoline leads to longer injection delay. At the initial injection region before reaching 0.8 ms, the spray tip penetration becomes longer as increasing the volume fraction of ethanol, but reversely shorter after 0.8 ms. It was found that ethanol makes spray angle become larger. The surface area per unit volume of the drop was decreased as the distance from the injection tip or the concentration of the gasoline increased.

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References

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