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

The Korean Society of Mechanical Engineers (대한기계학회)
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Fuel Evaporation Characteristics of a Port Injection Type Motorcycle Engine with Changing Fuel Spray Timing

포트분사식 이륜차 엔진의 연료 분사시기에 따른 연료 증발 특성

  • 이기형 (한양대학교 기계공학과) ;
  • 강인보 (한양대학교 대학원 기계공학과) ;
  • 김형민 (한양대학교 대학원 기계공학과) ;
  • 백승국 (케피코(주) 기술연구소)
  • Published : 2005.12.01
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Abstract

This study investigates the characteristics of spray, such as evaporation rate and spray trajectory, for a 4-hole injector which is applied to a 4-valve motorcycle gasoline engine. Three dimensional, unsteady, compressible flow and spray within the intake-port and cylinder have been simulated using the VECTIS code. Spray characteristics were investigated at 6000 rpm engine speed. Furthermore, we visualized fuel behavior in the intake-port using a CCD camera synchronized with a stroboscope in order to compare with the analytical results. Boundary and intial conditions were employed by complete 1-D simulation of the engine using the WAVE code. Fuel was injected into the intake-port at two time intervals relative to the position of the intake valves so that the spray arrived when the valves were closed and fully open. The results showed that the trajectory of the spray was directed towards the lower wall of the port with injection against the closed valves. With open valve injection, a large portion of the fuel was lifted by the co-flowing air towards the upper half of the port and this was confirmed by simulation and visualization.

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References

  1. Kunihiko Hayakawa, Shigeru Yamazaki and Dave Worth, 2004, '125CC Small Engine Fuel Injection System with Low Emissions Solutions,' SAE Technical Paper, No. 2004-32-0094
  2. Fu-Quan Zhao, Ming-Chia Lai and David L. Harrington, 1995, 'The Spray Characteristics of Automotive Port Fuel Injection-A Critical Review,' SAE Technical Paper, No. 950506
  3. VECTIS: Theory manual(Computational Fluid Dynamic Software), Release 3.7, Ricardo Co., March 2003
  4. Issa, 1986, 'Solution of the Implicitly Discretised Fluid Flow Equations by Operator Splitting,' J. Comp. Phys, pp. 45-65 https://doi.org/10.1016/0021-9991(86)90099-9
  5. Zhiyu Han, Scott Parrish, Patrick V. Farrell and D. Reitz, 1997, 'Modeling Atomization Processes of Pressure-Swirl Hollow-Cone Fuel Sprays,' Atomization and Sprays, Vol. 7, pp. 663 -684 https://doi.org/10.1615/AtomizSpr.v7.i6.70
  6. Bai, C. and Gosman, A.D, 1995, 'Development of Methodology for Spray Impingement Simulation,' SAE Technical Paper, 950283
  7. Yao, S.C. and Cai, K.Y., 1985, 'Dynamics and Heat Transfer of Drop Impacting on a Hot Surface at Small Angles,' ICLASS
  8. Wontae Kim, Shinjae Kang and Byungjoon Rho, 1999, 'A Study on the Flow Characteristics of Gasoline Spray Across the Suction Air Stream,' SAE Technical Paper, No. 99370282
  9. Brehm, C., Whitelaw, J. H., Sassi, L. and Vafidis, C., 1999, 'Air and Fuel Characteristics in the Intake Port of a SI Engine,' SAE Technical Paper, No. 1999-01-1491
  10. Heywood, J. B., 1988, 'Internal Combustion Fundamentals,' McGraw-Hill, pp. 314 - 321