Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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In-Cylinder Compression Flow Characteristics According to Inlet Valve Angle

흡입 밸브 각도에 따른 압축 행정 중 실린더 내 유동 특성

  • Ohm, In-Yong (Department of Mechanical Engineering, Seoul National University of Technology) ;
  • Park, Chan-Jun (Department of Mechanical Engineering, Seoul National University of Technology)
  • 엄인용 (서울산업대학교 기계공학과) ;
  • 박찬준 (서울산업대학교 기계공학과)
  • Published : 2006.07.01
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Abstract

A PIV(Particle Image Velocimetry) was applied to measure in-cylinder velocity field according to inlet valve angle during compression stroke. Two engines, one is conventional DOHC 4 valve and the other is narrow valve angle, were used to compare real compression flow. The results show that the flow patterns are well arranged compared with intake flow and the basic tumble flow structures are maintained until end compression stage regardless of valve angle. Also the results show that the tumble motion is intensified by momentum conservation during compression in normal engine. In the normal engine, the bulk shape of flow pattern is "Y" type at the top of cylinder and reverse "Y" type at the bottom of cylinder and weak reverse flow exists at the top of cylinder along cylinder center line. Otherwise, the other engine's flow pattern changes from "Y" type to "T" type at the top of cylinder during compression.

Keywords

References

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