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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of piston ring profiles and oil temperature distribution on cylinder liner lubrication of a marine two-stroke engine
    Autorzy:
    Wolff, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/132952.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    marine engines
    piston rings
    gasdynamics
    hydrodynamic lubrication
    mixed friction
    silniki okrętowe
    pierścienie tłokowe
    gazodynamika
    smarowanie hydrodynamiczne
    tarcie mieszane
    Opis:
    In the paper a comprehensive model of a piston-ring-cylinder (PRC) system has been presented. The local thickness of the oil film can be compared to height of the combined surface roughness of a cylinder liner and piston rings. Equations describing the mixed lubrication problem based on the empirical mathematical model formulated in works of Patir, Cheng and Greenwood, Tripp have been applied. The main parts of the model have been experimentally verified abroad by the author at the marine engine designing centre. In contrast to the previous papers of the author concerning the PRC system of combustion engines, new calculation results for a marine two-stroke engine have been presented. Firstly the right selection of barrel-shaped sliding surface of piston rings has been analysed. Secondly the influence of oil temperature distribution along the cylinder liner on the lubrication of the PRC system has been assessed. The developed model and software can be useful for optimization of the PRC system design.
    Źródło:
    Combustion Engines; 2019, 58, 3; 257-263
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of piston ring pack configuration on blowby and friction losses in a marine two-stroke engine
    Autorzy:
    Wolff, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/134100.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    marine engines
    piston rings
    gas dynamics
    hydrodynamic lubrication
    mixed friction
    silnik okrętowy
    pierścień tłokowy
    dynamika gazów
    smarowanie hydrodynamiczne
    tarcie mieszane
    Opis:
    In the paper a comprehensive model of a piston ring pack motion on an oil film has been presented. The local thickness of the oil film can be compared to height of the combined surface roughness of a cylinder liner and piston rings. Equations describing the mixed lubrication problem based on the empirical mathematical model formulated in works of Patir, Cheng and Greenwood, Tripp have been combined and used in this paper. In addition a model of gas flow through the labyrinth seal of piston rings has been developed. The main parts of the model and software have been experimentally verified abroad by the author at the marine engine designing centre. For the selected two-stroke marine engine, the influence of the number of piston rings used and the type of the top ring lock (straight or overlapped) on blowby to piston underside and on friction losses of the piston-ring-cylinder (PRC) system have been investigated. The developed model and software can be useful for optimization of the PRC system design.
    Źródło:
    Combustion Engines; 2017, 56, 3; 164-170
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of engine load on piston ring pack operation of an automotive IC engine
    Autorzy:
    Wolff, Andrzej
    Koszałka, Grzegorz
    Powiązania:
    https://bibliotekanauki.pl/articles/2097662.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    automotive IC engine
    piston rings
    blowby
    ring dynamics
    hydrodynamic lubrication
    mixed friction
    silnik o spalaniu wewnętrznym
    pierścienie tłokowe
    przedmuchy spalin
    dynamika pierścienia
    smarowanie hydrodynamiczne
    tarcie mieszane
    Opis:
    A piston-rings-cylinder (PRC) assembly determines the blowby, engine oil consumption, and friction and wear processes accompanying the system's operation. Thus, it is crucial for the whole IC engine efficiency and lifetime. A lot of research effort is put into increasing the performance of this complex and highly dynamic system. Advanced, comprehensive models play an important role in understanding and improving the PRC system. In the presented work, the effect of load on the operation of the ring pack of an automotive gasoline engine is analyzed. A comprehensive model that covers the gas flow through the crevices of the PRC system, ring displacements in the groove, and ring lubrication was used for this analysis. The results of the simulations show that the local thickness of the oil film, especially near the piston top dead center is compared to the height of the combined surface roughness of a cylinder liner and piston rings, and friction-related asperity contact strongly increases as the engine load increases. The simulations also show that the engine load affects the axial displacements of the rings in the grooves but practically does not affect the thickness of the oil film left by the ring pack on the cylinder liner.
    Źródło:
    Combustion Engines; 2022, 61, 3; 88--94
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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