الفهرس 
CHAPTER ONE: LITERATURE REVIEWOnly 14 pages are availabe for public view
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Abstract
The friction between piston rings and cylinder liner significantly contributes to the mechanical power losses of the engine. The wear processes promoted by oil contamination lead to shorter useful oil service life, reduced component life, and loss of engine performance. In the present study the effect of different contaminants on friction coefficient, friction and power losses during boundary lubrication process between piston ring and liner has been investigated. An original test rig simulating piston-liner movement was used for the purpose of clarifying the effect of various parameters such as particles grain size, particles concentrations, contaminants types and reciprocating speeds. Experimental results showed that contaminants affected strongly the predicted oil film thickness formed between the piston ring and liner. Contaminants grain size and concentrations have been observed to have a major impact on boundary friction coefficient, friction and power losses. The effect of different contaminants on ring wear has also been investigated.