Abstract
In the paper a model of a piston ring pack motion on an oil film has been analysed. The local oil film thickness can be compared to height of the combined roughness of mating surfaces of piston rings and cylinder liner. Equations describing the mixed lubrication problem based on the empirical mathematical model formulated in works of Patir, Cheng [6, 7] and Greenwood, Tripp [3] have been combined [12] and used in this paper. A model of a gas flow through the labyrinth seal of piston rings has been developed [13, 15]. In addition models of ring twist effects and axial ring motion in piston grooves have been applied [14, 15]. In contrast to the previous papers of the author, an experimental verification of the main parts of developed mathematical model and software has been presented. A relatively good compatibility between the experimental measurements and calculated results has been achieved. In addition this study presents the simulation results for an automobile internal combustion engine
Highlights
Piston rings are important part of internal combustion engines
The hydrodynamic force generated by this thin oil film is opposed by a combination of the gas pressure acting on the back side of each ring and the ring stiffness
The oil film is typically thick enough to expect the existence of mixed lubrication, so this phenomenon should be taken into account [1, 3, 6, 7, 12]
Summary
Piston rings are important part of internal combustion engines. Commonly a set of piston rings is used to form a dynamic gas seal between the piston and cylinder wall. The sliding motion of the piston forms a thin oil film between the ring land and cylinder wall, which lubricates the sliding components [4, 9, 11]. The oil film is typically thick enough to expect the existence of mixed lubrication, so this phenomenon should be taken into account [1, 3, 6, 7, 12] Numerical simulation of these processes, which take place in a typical piston ring pack operation, is important from practical point of view. Zwykle stosowany jest zestaw pierścieni tłokowych, aby utworzyć dynamiczne uszczelnienie gazowe pomiędzy tłokiem i gładzią cylindrową. Które towarzyszą pracy typowego pakietu pierścieni tłokowych, jest istotna z praktycznego punktu widzenia
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