Influence of engine load on piston ring pack operation of a marine two - stroke engine

• Autorzy: Wolff A.
• Języki publikacji: EN

Abstrakty

EN

A set of piston rings is used to form a dynamic gas seal between the piston and cylinder wall. Many physical phenomena are associated with the operation of the system piston-ring-cylinder (PRC), such as: inter-ring gas dynamics for the labyrinth seal, hydrodynamic lubrication and mixed friction in gaps between the rings and cylinder liner, oil flow and distribution of lubricant along the liner, twist motion of rings, liner temperature influence on the oil viscosity. A complex model of the PRC system has been developed by the author. Among own models it includes several sub-models taken from literature, like: a model of viscous oil flow between rough gap surfaces formulated by Patir and Cheng and an elastic contact model of Greenwood and Tripp. The main parts of the mathematical model and software have been experimentally verified abroad by the author at the marine engine-designing centre. A relatively good qualitative and quantitative compatibility between the experimental measurements and calculated results has been achieved. In contrast to the previous papers of the author, new calculation results for a marine two-stroke engine have been presented. These results concern influence of engine load on piston ring pack operation of the analysed engine. They include basic physical quantities associated with gas and oil flow in the piston-ring-cylinder system of the engine. The developed model can be utilized for: evaluation of gas leakage through the sealing ring set, prediction of lubrication conditions of piston rings and oil consumption, defining areas of the possible cylinder liner wear and profile changes of piston rings sliding surfaces, and thus can be useful for optimization of the PRC system design.

Słowa kluczowe

EN

marine engines; piston rings; gas dynamics; hydrodynamic lubrication; mixed friction

• 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: 2012
• Tom: Vol. 19, No. 2
• Strony: 557--568
• Opis fizyczny: Bibliogr. 18 poz., rys.

Twórcy

autor

Wolff A.

• Warsaw University of Technology Faculty of Transport Koszykowa Street. 75, 00-662 Warsaw, Poland tel.: [phone], fax: [phone],

Bibliografia

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• [14] Wolff, A., Piechna, J., Numerical simulation of piston ring pack operation with regard to ring twist effects, The Archive of Mech. Engineering, Vol. LIV, No. 1, pp. 65-99, Warsaw 2007.
• [15] Wolff, A., Experimental verification of the model of piston ring pack operation of an internal combustion engine, The Archive of Mechanical Engineering, Vol. LVI, No. 1, pp. 73-90, Warsaw 2009.
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• [17] Wolff, A., Modelowanie i symulacja numeryczna funkcjonowania pakietu pierścieni tłokowych dwusuwowego silnika okrętowego, Zesz. Nauk. Inst. Pojazd., Wydz. Sam. i Masz. Robocz., Warsaw University of Technology, Z. 1 (82), pp. 5-17, Warsaw 2011.
• [18] Wolff, A., Numerical analysis of piston ring pack operation of a marine two-stroke engine, Combustion Engines, No. 3/2011 (146), (article on CD enclosed to the periodical), Poznań 2011