Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지

Effects of Piston Shapes and Intake Flow on the Behavior of Fuel Mixtures in a GDI Engine

  • Kang, Jeong-Jung (Graduate School of Mechanical Engineering, Pusan National University) ;
  • Kim, Duck-Jool (School of Mechanical Engineering, Pusan National University)
  • Published : 2003.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

The purpose of this study is to investigate the stratification of fuel vapor with different in-cylinder flow, piston cavity and injection timings in an optically accessible engine. Three different piston shapes that are F(Flat), B(Bowl) and R(Re-entrance) types were used. The images of liquid and vapor fuel were captured under the motoring condition using Laser Induced Exciplex Fluorescence technique. As a result, at early injection timing of 270 BTDC, liquid fuel was evaporated faster by tumble flow than swirl flow, where most of fuel vapor were transported by tumble flow to the lower region and both sides of cylinder for the F-type piston. At late injection timing of 90 BTDC, tumble flow appears to be moving the fuel vapor to the intake side of the cylinder, while swirl flow convects the fuel vapor to the exhaust side. The concentration of mixture in the center region was highest in the B-type piston, while fuel vapor was transported to the exhaust side by swirl flow in F and R-type pistons. At the injection timing of 60 BTDC, the R-type piston was better for stratification due to a relatively smaller bowl diameter than the others.

Keywords

References

  1. Iwamoto, Y., Noma, K., Nakayama, 0., Yamauchi, T. and Ando, H., 1997, 'Development of Gasoline Direct Injection Engine', SAE Paper 970541
  2. Kakuhou, A., Urushihara, T., Itoh, T. and Takagi, Y., 1999, 'Characteristics of Mixture Formation in a Direct Injection SI Engine with Optimized In-Cylinder Swirl Air Motion,' SAE Paper 1999-01-0505
  3. Kanda, M., Baika, T., Kato, S., Iwamuro, M., Koike, M. and Saito, A., 2000, 'Application of a New Combustion Concept to Direct Injection Engine,' SAE Paper 2000-01-0530
  4. Kume, T., Iwamoto, Y., Iida, K., Murakame, M., Akishino, K. and Ando, H., 1996, 'Combustion Control Technologies for Direct Injection SI Engine', SAE Paper 960600
  5. Lee, S., McGee, J. M., Quay, B. D. and Santavicca, D. A., 1999, 'A comparison fuel Distribution and Combustion During Engine Cold Start for Direct and Port Fuel Injection Systems,' SAE Paper 1999-01-1490
  6. Moriyoshi, Y., Nomura, H. and Saisyu, Y., 1998, 'Evaluation of a Concept for DI Gasoline Combustion Using Enhanced Gas Motion,' SAE Paper 980152
  7. Ohsuga, M., Shiraishi, T., Nogi, T., Nakayama, Y. and Sukegawa, Y., 1997, 'Mixture Preparation for Direct-Injection SI Engines,' SAE Paper 970542
  8. Tabata, M., Kataoka, M., Yannaka, T. and Masahisa Yamakawa, 2000, 'Measuremet of Fuel Distribution in the Piston Cavity of Direct Injection SI Engine by Using LIF', SAE Paper 200001-0240
  9. Wagner, V., Ipp, W., Wensing, M. and Leipertz, A., 1999, 'Fuel Distribution and Mixture Formation Inside a Direct Injection SI Engine Investigated by 2D Mie and LIEF Techniques,' SAE Paper 1999-01-3659
  10. Zhao, F.-Q., Lai, M.-C. and Harrington, D. L., 1997, 'A Review of Mixture Preparation and Combustion Control Strategies for Spark-Ignited Direct-Injection Gasoline Engine,' SAE Paper 970627