Formation of fuel mixture in a SI two-stroke engine with direct fuel injection

• Autorzy: Mitianiec W. , Forma M.
• Języki publikacji: PL

Abstrakty

EN

Decreasing of fuel consumption and high hydrocarbon emission in a SI two-stroke engine applied in motorcycles, scooters and small power units is possible by change of fuelling system on direct fuel injection. The main problem of mixture formation is short time for fuel evaporation after injection which should begin after closing of the exhaust port. However well interaction between the scavenge air and fuel jet from the injector located in the cylinder head can induce the small size of fuel droplets and fast evaporation. The paper presents the computational results of fuel mixture formation and combustion process in direct fuel injection two-stroke engine Robin EC-12 with capacity 115 cm3. The simulation was carried out by use KIVA code with assumption of initial parameters from the experiment of the carbureted engine. Earlier fuel injection influences on better evaporation and mixture formation with small stratification, which enables full mixture combustion. The paper shows phases of mixture formation, combustion and concentration of the combustion product in the cylinder. Spray guided high pressure direct injection system in SI two-stroke engine enables fulfill the restrictions of gas emission of one-wheeler vehicles and small power units. New modern two-stroke engines and environmental protection require new fuelling systems and one of the most promising methods is direct spray guided fuel injection. Many work were done in this subject, however still there is no better option for small power two-stroke engines.

Słowa kluczowe

EN

combustion engines; crank drive

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2008
• Tom: Vol. 15, No. 2
• Strony: 329--337
• Opis fizyczny: Bibliogr. 7 poz., rys.

Twórcy

autor

Mitianiec W.

autor

Forma M.

• Cracow University of Technology Al. Jana Pawla II37, 31-864 Krakow, Poland tel: [phone]; fax: [phone],

Bibliografia

• [1] Amsden, A. A. et al., KIVA: A Computer Program for Two- and Three-Dimensional Fluid Flows with Chemical Reactions and Fuel Sprays, Rept. LA-10245-MS, 1985.
• [2] Chen, Y. S., Kim, S. W., Computation of Turbulent Flows Using an Extended k-e turbulance closure model, NASA CR-179204, 1987.
• [3] Ghandi, J. B. et al., Investigation of the Fuel Distribution in a Two-Stroke Engine with an Air-Assisted Injector, SAE Paper 940394, SAE Int. Congress & Exp., Detroit 1994.
• [4] Ikeda, Y., Nakajima, T., Kurihara, N., Spray Formation of Air-Assist Injection for Two-Stroke Engine, SAE Paper 950271, SAE Int. Congress & Exposition, Detroit 1995.
• [5] Kuo, T., Reitz, R., Three-dimensional computations of combustion in premixed-charge and direct-injected two-stroke engines, SAE paper 920425, 1992.
• [6] Melton, L. A., Exciplex-Based Vapor/Liquid Visualization Systems Approppriate for Automotive Gasolines, Report #1, Contract #27, Texas H. Educ. Coord. Board, Nov. 1990.
• [7] Mitianiec, W., Wtrysk paliwa w silnikach dwusuwowych małej mocy, Polska Akademia Nauk, Krakow 1999.