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논문 상세정보

직접분사식 소형 디젤엔진의 실린더내 스월 유동장에 미치는 흡기포트의 형상에 관한 연구

A Study on the Effects of Intake Port Geometry on In-Cylinder Swirl Flow Field in a Small D.I. Diesel Engine

Abstract

This paper studies the effects of intake port configuration on the swirl that is key parameter in the flow field of direct injection diesel engines. In-cylinder flow characteristics is known to have significant effects on fuel air mixing, combustion and emissions. To investigate the swirl flow generated by various intake ports, steady state flow tests were conducted to evaluate the swirl. Helical port geometry, SCV shape and bypass were selected as the design parameters to increase the swirl flow and parametric study was performed to choose the optimal port shape that would generate a high swirl ratio efficiently. The results revealed that a key factor in generating a high swirl ratio was to suitably control the direction of the intake air flow passing through the valve seat. For these purposes, we changed the distance of helical and tangential port as well as installed bypass near the valve seat and the effects of intake port geometry on in-cylinder flow field were visualized by a laser sheet visualization method. From the experimental results, we found that the swirl ratio and mass flow rate had a trade off relation. In addition, the result indicates that the bypass is a effective method to increase the swirl ratio without sacrificing mass flow rate.

저자의 다른 논문

참고문헌 (7)

  1. K. Y. Kang and R. D. Reitz, 'The Effect ofIntake Valve Alignment on Swirl Generation ina Dl Diesel Engine,' Experimental Thermaland Fluid Science 20, pp.94-103, 1999 
  2. K. H. Lee, 'Development of EvaluationMethod for Intake Flow Characteristics in a Gasoline Engine,' Journal of the ResearchInstitute of Industrial Sciences, Hanyang University, Vol.40, pp.241-251, 1995 
  3. K. H. Lee, 'Development of Impulse Swirl/Tumbe Meter for Analyzing Swirl and TumbleFlow,' Journal of Engineering & Technology, Hanyang University, Vo;.4, No.1, 1995 
  4. J. I. Kawashima, H. Ogawa and Y. Tsuru,'Research on a Variable Swirl Intake Port for 4valve IIigh-Speed DI Diesel Engines,' SAE982680, 1998 
  5. P. W. Stepenson, P. J. Claybaker and C. J. Rutland, 'Modeling the Effects of Intake Gene-rated Turbulence and Resolved Flow Structures on Combustion in DI Diesel Engines,' SAE 960634, 1996 
  6. I. Y. Ohm, I. S. Jeung and K. S. Jeong, 'FuelBehavior in the Cylinder during the IntakeProcess,' Transactions of KSAE, Vol.7, No.4, pp.54-59, 1999 
  7. J. Y. Lee, B. K. Choi, J. W. Lee, K. Y. Kangand Y. J. Chang, 'Flow Field Measurement and Analysis with Swirl Ratio Variation in a D.I.Single Cylinder Diesel Engine,' 2000 KSAE Spring Conference, pp.273-278, 2000 

이 논문을 인용한 문헌 (1)

  1. Bang, Joong-Cheol 2007. "The Effect of Combustion Process by Intensifying the Air Flow in Combustion Chamber of D.I. Diesel Engine" 한국자동차공학회논문집 = Transactions of the Korean Society of Automotive Engineers, 15(5): 153~159 

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