Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Analysis of In-Cylinder Flow Characteristics of a High Speed D.I. Diesel Engines

고속 직접분사식 디젤 엔진의 실린더내 유동 해석

  • Park, Sang-Chan (Dept. of Mechanical Engineering, Graduate School of Hanyang University) ;
  • Ryu, Jae-Deok (Dept. of Mechanical Engineering, Graduate School of Hanyang University) ;
  • Lee, Gi-Hyeong (Dept. of Mechanical Engineering, Hanyang University)
  • 박상찬 (한양대학교 대학원 기계공학과) ;
  • 류재덕 (한양대학교 대학원 기계공학과) ;
  • 이기형 (한양대학교 기계공학과)
  • Published : 2002.09.01
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Abstract

Recently, HSDI (High Speed Direct Injection) diesel engine has been spotlighted as a next generation engine because it has a good potential for high thermal efficiency and fuel economy. This study was carried out to investigate the in-cylinder flow characteristics generated in a 4-valve small diesel cylinder head with a tangential and helical intake port. The flow characteristics such as coefficient of flow rate(Cf), swirl ratio (Rs), and mass flow rate (ms) were measured in the steady flow test rig using the impulse swirl meter and the analysis of in-cylinder flow field was conducted by experiment using the PIV and calculation using the commercial CFD code. As the results from steady flow test indicate, the mass flow rate of the cylinder head with a short distance between the two intake ports is increased over 13% than that of the other head. However, the non-dimensional swirl ratio is decreased approximately 15%. From in-cylinder flow characteristics obtained by PIV and CFD calculation, we found that the swirl center was eccentric from the cylinder center and the velocity distribution became uniform near the TDC. In addition, the results of the calculation are good agreement with the experimental results.

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References

  1. Noboru Hikosaka, 1997, 'A View of the Future of Automotive Diesel Engines,' SAE paper 972682, pp. 11-21
  2. Herrmann, H,-O. and Dumhoz, M., 1995, 'Development of a DI-Diesel Engine with Four Valves for Passenger Cars,' SAE paper 950808, pp. 109-119
  3. Jun-ichi Kawashima, Hiroshi Ogawa and Yoshiyuki Tsura, 1998, 'Research on a Variable Swirl Intake Port for 4-Valve High-Speed DI Diesel Engines,' SAE Paper 982680, pp. 1-18
  4. Lee, K. H., 1995, 'Development of Evaluation Method for Intake Flow Characteristics in a Gasoline Engine,' J. Res. Inst. Ind. Sci., Hanyang Univ., pp. 241-249
  5. Arcoumnis, C., Bicen, A. F. and Whitelaw, J. H., 1983, 'Squirl and Swirl-Squish Interaction in Motored Model Engines,' Transaction of ASME, Vol. 105, pp. 105-112
  6. Akira Murakami, Masataka Arai, and Hiroyaki Hiriyasu, 1988, 'Swirl Measurements and Modeling in Direct Injection Diesel Engines,' SAE paper 880385, pp. 1-17