Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Effect of Inlet Valve Angle on In-Cylinder Swirl. Generation Characteristics(II)

흡입밸브 각이 실린더 내 와류 발생 특성에 미치는 영향(II)

  • 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 : 2009.03.01
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Abstract

This paper is the second of 2 companion papers which investigate in-cylinder swirl generation characteristics according to inlet valve angle. Two DOHC 4 valve engines, one has wide intake valve angle and the other has narrow valve angle, were used to compare the characteristics of swirl motion generation in the cylinder. One intake port was deactivated to induce swirl flow. A PIV (Particle Image Velocimetry) was applied to measure in-cylinder velocity field according to inlet valve angle during intake stroke. The results show that the flow patterns of narrow valve engine are much more stable and well arranged compared with the normal engine over the entire intake and compression stroke except early intake stage, and very strong swirl motion is generated at the end of compression stage in this engine nevertheless using straight port which is unfavorable for swirl generating. In the wide valve angle one, however, strong swirl motion induced during intake stroke is destroyed as the compression progresses.

Keywords

References

  1. I. Y. Ohm and Y. S. Cho, 'Mechanism of Axial Stratification and its Effect in an SI Engine,' SAE2000-01-2843, 2000 SAE Transaction - Journal of Fuel & Lubricants, 2001
  2. I. Y. Ohm and Y. S. Cho, 'In-Cylinder Fuel Behavior according to Fuel Injection Timing and Port Characteristics in an SI Engine : Part III-With High Swirl,' Transactions of KSAE, Vol.9, No.3, pp.18-26, 2001
  3. G. B. Cho, C. H. Jeon, Y. J. Chang and K. Y. Kang, 'Characteristics of In-cylinder Steady Flow using PIV for Different Intake Port Geometries in a 4-valve Gasoline Engine,' Transactions of KSAE, Vol.5, No.5, pp.188-196, 1997
  4. I. Y. Ohm, C. J. Park and H. S, Kim, "InCylinder Intake Flow Characteristics of Helical Port Engines with Wide Valve Angle," Fall Conference Proceedings, Vol.I KSAE, pp.138-146,2006
  5. I. Y. Ohm, C. J. Park, H. S, Kim, 'In-Cylinder Compression Flow Characteristics of Helical Port Engines with Wide Valve Angle,' Fall Conference Proceedings, Vol.I, KSAE, pp.167-174,2006
  6. G. B. Cho, C. H. Jeon, Y. J. Chang and K. Y. Kang, 'Characteristics of In-cylinder Steady Flow using PIV for Different Intake Port Geometries in a 4-valve Gasoline Engine,' Transactions of KSAE, Vol.5, No.5, pp.188-196,1997
  7. S. Y. Lee, K. S. Jeong, C. H. Jeon and Y. J. Chang, "Study on The In-Cylinder Flow Characteristics of An SI Engine Using PIV," Int. J. Automotive Technology, Vol.6, No.5, pp.453-460, 2005
  8. K. H. Lee, C. S. Lee, H. G. Lee, M. S. Chon and Y. C. Joo, 'Spatial Analysis of Turbulent Flow in Combustion Chamber using High Resolution Dual Color PIV,' Transactions of KSAE, Vol.6, No.6, pp.132-141, 1998
  9. C. H Lee, K. H. Lee and C. S. Lee, 'An Experimental Study on the Flow Characteristics and the Stratification Effects in Visualization Engine Using the DPIV and the Entropy Analysis,' Transactions ofKSAE, Vol.13, No.1, pp.9-18, 2005
  10. K. H. Lee, J. D. Ryu, C. S. Lee and R. D. Reitz, 'Effect of Intake Port Geometry on The In-Cylinder Flow Characteristics in A High Speed D.I. Diesel Engine,' Int. J. Automotive Technology, Vol.6, No.1, pp.1-8, 2005
  11. J. H. Park, N. H. Lee and K. H. Choi, 'Analysis of In-Cylinder Flow Fields using Particle Image Velocimetry,' Transactions of KSAE, Vol.7, No.4, pp.46-53, 1999
  12. J. H. Park, N. H. Lee and K. H. Choi, 'Analysis of Spray and Flow Fields for Development of Spark-ignited Direct Injection Engine,' Transactions of KSAE, Vol.6, No.6, pp.202-209, 1998
  13. I. Y. Ohm and C. L. Myung, 'In-Cylinder Flow Measurement Using PIV,' Spring Conference Proceedings, KSAE, Vol.I, pp.80-87, 2002
  14. I. Y. Ohm and C. J. Park, 'In-Cylinder Intake Flow Characteristics according to Inlet Valve Angle,' Transactions of KSAE, Vol.14, No.3, pp.142-149,2005