Tribology of piston compression ring conjunction under transient thermal mixed regime of lubrication |
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| Affiliation: | 1. Wolfson School of Mechanical & Manufacturing Engineering, Loughborough University, Loughborough, UK;2. Aston Martin Lagonda, Gaydon, Warwickshire, UK;1. Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, UK;2. Applied Sciences Department, Lubrizol Limited, Hazelwood, Derbyshire, UK;1. IK4-TEKNIKER, Calle Iñaki Goenaga 5, 20600 Eibar, Spain;2. AVL List GmbH, Hans-List-Platz 1, 8020 Graz, Austria;3. RENAULT, Direction de la Recherche, des Etudes Avancées et des Matériaux. SCE 68530. FR TCR LAB 0121, Avenue du Golf, 78288 Guyancourt Cedex, France;4. University of the Basque Country, UPV-EHU, Faculty of Engineering, Department of Mechanical Engineering, IKERBASQUE, Basque Foundation for Science, Alameda Urquijo s/n, 48013 Bilbao, Spain;5. Spanish National Research Council, Institute of Materials Science of Madrid, C/Sor Juana Inés de la Cruz 3, Madrid 28048, Spain;6. Spanish National Research Council, Institute “Eduardo Torroja” of Construction Sciences, C/Serrano Galvache 4, Madrid 28033, Spain;1. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, People’s Republic of China;2. School of Mechanical Electronic Technology, Shanghai JianQiao University, Shanghai 201306, People’s Republic of China;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai 200240, People׳s Republic of China;2. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, People׳s Republic of China;3. Research and Development Center of China׳s First Automotive Works (FAW) Group, Changchun 130011, People׳s Republic of China |
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| Abstract: | Fuel efficiency is the main IC engine attribute, with the compression ring-bore contact consuming nearly 5% of the fuel energy. Analyses are often idealised, such as isothermal condition and smooth surfaces, the former being particularly contrary to practice. An analytic solution to the average flow model is presented for this contact with a new analytical thermal model. The generated contact temperatures, particularly at the inlet result in thinner films than the idealised analyses. For the simulated city driving condition the power loss is mainly due to viscous shear under cold engine condition, whilst for a hot engine boundary friction dominates. |
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