Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Unsteady Intermittent Spray Characteristics of PEI Gasoline Injector

PEI용 가솔린 인젝터의 비정상 간헐 분무 특성

  • Kim Beomjun (Graduate of Mechanical Engineering, Chonbuk National University) ;
  • Lee Jaiho (Graduate of Mechanical Engineering, Chonbuk National University) ;
  • Cho Daejin (Graduate of Mechanical Engineering, Chonbuk National University) ;
  • Yoon Suckju (Department of Mechanical Engineering, Automobile Hi-technology Research Center, Chonbuk National University)
  • 김범준 (전북대학교 기계공학과 대학원) ;
  • 이재호 (전북대학교 기계공학과 대학원) ;
  • 조대진 (전북대학교 기계공학과 대학원) ;
  • 윤석주 (전북대학교 자동차 신기술 연구센터)
  • Published : 2005.09.01
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Abstract

The effect of fuel injection spray on engine performance has been known as one of the major concerns for improving fuel economy and reducing emissions. In general, reducing the spray droplet size could prevent HC emission in gasoline engine. As far as PFI gasoline engine is concerned, the mixture of air and fuel may not be uniform under a certain condition, because breakup and production of spray droplets are made in a short distance between the fuel injector and intake valve. This study, by constituting PFI gasoline spray system, was performed to study the transient spray characteristics and dynamic behavior of droplets from two-holes two-sprays type injector used in DOHC gasoline engine. Mean droplet size and optical concentration in accordance with various conditions were measured by LDPA and CCD camera. Through this study, the variation of drop size and optical concentration could be used for understanding the behavior of unsteady spray was declared and the existing the small droplets between each pulse spray could be estimated caused to the development of wall film was conformed.

Keywords

References

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