Analysis of direct fuel injection in a small power two-stroke engine

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

Abstrakty

EN

Small power two-stroke engines can be competitive in regard of work parameters and pollutants emission in relation to four-stroke engines at some modifications, particularly changing of fuelling system. The paper presents a modifted air-assisted direct fuel injection in a two-stroke engine, which changes propagation of fuel jet in the combustion chamber. The main problem of mixture formation is short time for fuel evaporation after injection which should begin after closing of the exhaust port. The paper shows interaction between the scavenge air, additional air stream and fuel jet from the injector located in the cylinder head, which can induce the small size of fuel droplets and fast evaporation. The computational results of fuel mixture formation and combustion process in direct fuel injection two-stroke engine Robin EC-12 with capacity 115 cm3 are presented. The simulation was carried out by use KIVA code with assumption of initial parameters from the experimental tests on the carburetted engine. Setting of the injector in a regard of the cylinder head decides of fuel motion and evaporation in the combustion chamber. Air-assisted fuel injection influences on higher mixing of fuel and better combustion than by using DFI system. The paper shows phases of mixture formation, combustion and concentration of the combustion product in the cylinder with additional air stream. Spray guided high pressure direct injection system in SI two-stroke engine enables fulfil the restrictions of gas emission of one-wheeler vehicles and small power units.

Słowa kluczowe

EN

transport; engine development; two-stroke engine; direct fuel

• 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: 2009
• Tom: Vol. 16, No. 2
• Strony: 337--347
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Mitianiec W.

autor

Forma M.

• Cracow University of Technology, Jana Pawła II 37, 31-864 Cracow, Poland tel: [phone], fax: [phone],

Bibliografia

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• [2] Chen, Y. S., Kim S.W. , Computation of Turbulent Flows Using an Extended k-e turbulence 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 rect-injected two-stroke engines, SAE paper 920425, 1992.
• [6] Melton, L. A., Exciplex-Based Vapor/Liquid Visualization Systems Appropriate 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, Kraków, 1999.
• [8] Mitianiec, W., Forma, M., Simulation and experimental test of spray guided direct fuel injection in a two-stroke engine, Combustion Engines, 2009-SC2, PTNSS-2009-SC-43, pp. 105-112, Bielsko-Biała, 2009.
• [9] Mitianiec, W., Forma, M., Influence of charge motion on spray guided direct fuel injection in small power two-stroke engine, 12th EAEC European Automotive Congress, No 01-017, Bratislava, 29.06-1.07.2009.
• [10] Sinnamon, J.F., Lancaster, D.R., Steiner, J.C., An Experimental and Analytical Study of Engine Fuel Spray Trajectories, SAE International Congress and Exposition, SAE Paper No. 800135, Detroit, 1980.