Study on Power Loss and Efficiency by Tribological Characteristics of the Cylinder Liner in Internal Combustion Engines.

This research aims to evaluate the effect of surface texturing on the cylinder liner on tribological characteristics such as minimum oil film thickness, power losses, and dynamic forces (asperity contact force, hydrodynamic force, and total friction force). The research covers the study of two lubrication conditions: (a) starved and (b) fully flooded. The surface texturing on the cylinder liner was produced by dimpling. For the development of the study, a numerical model was used with MATLAB® software. The analysis of the dynamic forces demonstrated that dimples in the cylinder liner led to a 10.10% decrease in the asperity contact force between the piston ring and the cylinder liner. On the other hand, surface texturing allows a 4.32% increase in the minimum oil film thickness, which results in a 6.05% decrease in power loss. The surface texturing improves the engine's energy efficiency by 3.11%. The fully flooded lubrication condition leads to higher estimates of the frictional force present in the combustion chamber. In general, the mathematical model allows estimating the tribological behavior between the compression ring and the cylinder liner, which is a useful tool for evaluating strategies to minimize the power lost due to surface friction. [ABSTRACT FROM AUTHOR]