Fuel Spray Behavior in a Small DI Diesel Engine: Effect of Combustion Chamber Geometry
Published March 6, 2000 by SAE International in United States
Annotation of this paper is available
Event: SAE 2000 World Congress
Reductions in fuel consumption and pollutant emissions from direct injection diesel engines are important issues in engine research. To achieve these reductions, rapid and better fuel air mixing is the most important requirement. The mixing quality of diesel spray with air is generally improved by selecting the best injection parameters and improving the characteristics of air movement in the combustion chamber. The shape of the combustion chamber can also help to form better mixtures. In this study, improvement in mixture formation was attempted by changing the combustion chamber geometry.
The fuel spray development was visualized from two directions in an actual engine with a transparent cylinder and piston arrangement. The place where spray impinges, the distance from impinging wall to nozzle tip, and the shape of the chamber entrance and bottom were varied to determine their effects on the fuel spray development in the combustion chamber.
It was found that a re-entrant type combustion chamber with round lip and round bottom corners provides better air and fuel distribution than a simple cylindrical combustion chamber. From the results modifications of the available empirical equations for calculating the spray path length and the area where spray spreads were attempted.
CitationMontajir, R., Tsunemoto, H., Ishitani, H., and Minami, T., "Fuel Spray Behavior in a Small DI Diesel Engine: Effect of Combustion Chamber Geometry," SAE Technical Paper 2000-01-0946, 2000, https://doi.org/10.4271/2000-01-0946.
- Matsui Y., Kimura S., Koike M., “A New Combustion Concept for Small DI Diesel Engines- 1st Reoprt: Introduction of the Basic Technology.” Transaction of the Japan Society of Automotive Engineers, Vol.28, No.1, Paper No. 9730416 (Japanese).
- Senda J., Kanda T., Kobayashi M., Fujimoto H., “Quantitative Analysis of Fuel Vapor Concentration in Diesel Spray by Exiplex Fluorescence Method.” SAE Paper No. 970796 (1997).
- Dan T., Takagishi S., Senda J., Fujimoto H., “Effect of Ambient Gas Properties for Characteristic of Non-Reacting Diesel Fuel Spray.” SAE Paper No. 970352 (1997).
- Ricart L. M., Xin J., Bower G. R., Reitz R. D., “In-Cylinder Measurement and Modeling of Liquid Fuel Spray Penetration in a Heavy-Duty Diesel Engine.” SAE Paper No. 971591 (1997).
- Chaves H., Hentschel W., Obermeier F., Stasicki B., “In-Cylinder High Speed and Stroboscopic Video Observation of Spray Development in a DI Diesel Engine.” SAE Paper No. 961206 (1996).
- Ricart L. M., Reitz R. D., “Visualization and Modeling of Pilot Injection and Combustion in Diesel Engines”. SAE Paper No. 960833 (1996).
- Minami T. et al. “Analysis of Fuel Spray Characteristics and Combustion Phenomena Under High Pressure Injection.” SAE Paper No. 900435 (1990).
- Hiroyasu H., “Diesel Engine Combustion and It's Modeling.” COMODIA 85 (1985).
- Su T. F., Chang C. T., Reitz R. D., Farrell P. V., Pierpont A. D. and Tow T. C., “Effect of Injection Pressure and Nozzle Geometry on Spray SMD and DI Emissions.” SAE Paper No. 952360 (1995).
- Yoshikawa S., Furusawa R., Arai M. and Hiroyasu H., “Optimizing Spray Behavior to Improve Engine Performance and to Reduce Exhaust Emission in a Small DI Diesel Engine.” SAE Paper No. 890463 (1989).
- Hiroyasu H. and Arai M., “Structure of Fuel Spray in Diesel Engines.” SAE Paper No. 900475 (1990).
- Tsunemoto H., Yamada T., and Ishitani H., “Behavior of Adhereing Fuel on Cold Combustion Chamber Wall in Direct Injection Diesel Engines.” SAE Paper No. 861235, (1986).
- Ebara T., Amagi K., Arai M., “Movement and Structure of Diesel Spray Impinging on an Inclined Wall.” SAE Paper No. 970046 (1997).
- Montajir R. M., Tsunemoto H., and Ishitani H., “Effect of Air Flow and Chamber Shape on Fuel Spray Behavior in a DI Diesel Engine.” Transaction of JSME, Vol. 63, No. 631, Paper No. 98-1097 (Japanese).
- Kuniyoshi et al., “A study of Diesel Spray Characteristic.” JSME (1980) Vol. No. 11 (Japanese).
- Dent J. C. et al, “Interferometric Studies of Vaporizing and Combusting Spray.” SAE Paper No. 830244 (1983).
- Sakane et. al. “Behavior of Spray Impinging on the Wall.” JSME (1988) Vol. 54 No. 503 B (Japanese).
- Saitoh M., Fujimoto H., “A study of the Characteristic of Impinging Diesel Spray.” Ph. D. Thesis 1997, Doshisha University, Japan.