Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Flame Propagation Characteristics in a Heavy Duty Liquid Phase LPG Injection SI Engine by Flame Visualization

대형 액상 LPG 분사식 SI 엔진에서 화염 가시화를 이용한 희박영역에서의 화염 전파특성 연구

  • 김승규 (한양대학교 기계공학과) ;
  • 배충식 (한양대학교 기계공학과) ;
  • 이승목 (자동차부품연구원 동력시스템실) ;
  • 김창업 (자동차부품연구원 동력시스템실) ;
  • 강건용 (자동차부품연구원 동력시스템실)
  • Published : 2002.07.01
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Abstract

Combustion and flame propagation characteristics of the liquid phase LPG injection (LPLI) engine were investigated in a single cylinder optical engine. Lean bum operation is needed to reduce thermal stress of exhaust manifold and engine knock in a heavy duty LPG engine. An LPLI system has advantages on lean operation. Optimized engine design parameters such as swirl, injection timing and piston geometry can improve lean bum performance with LPLI system. In this study, the effects of piston geometry along with injection timing and swirl ratio on flame propagation characteristics were investigated. A series of bottom-view flame images were taken from direct visualization using an W intensified high-speed CCD camera. Concepts of flame area speed, In addition to flame propagation patterns and thermodynamic heat release analysis, was introduced to analyze the flame propagation characteristics. The results show the correlation between the flame propagation characteristics, which is related to engine performance of lean region, and engine design parameters such as swirl ratio, piston geometry and injection timing. Stronger swirl resulted in foster flame propagation under open valve injection. The flame speed was significantly affected by injection timing under open valve injection conditions; supposedly due to the charge stratification. Piston geometry affected flame propagation through squish effects.

Keywords

References

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