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A semi-deterministic model of the piston ring-cylinder liner contact incorporating an oil availability model
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-7029-1112
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0001-9110-2819
2011 (English)Conference paper, Oral presentation only (Other academic)
Abstract [en]

In work presented last year at the 37th Leeds-Lyon Symposium on Tribology a semi-deterministic model of the piston ring-cylinder liner contact was developed. The honing grooves (texture) were considered on a global scale and the surface roughness was incorporated on a local scale using the homogenization mathematical averaging technique. However, as noted at the time, the contact throughout the full engine cycle was considered to be fully flooded. It was assumed that there was always enough lubricant present to fully flood the entrance to the contact. In reality this is unlikely to be the case, particularly during the midstroke of the cycle, as with high entraining speeds the predicted hydrodynamic films can be several microns thick and there is unlikely to be sufficient lubricant on the liner to form these thick films. Therefore, an oil availability model has been developed to track the quantity of oil available on along the length of the liner. The full ring pack, compression, scraper and oil control ring are modelled. It is assumed that the oil control ring always runs in the fully flooded condition and the scraper and compression ring have the oil available to them that they left behind on the previous stroke. In the previous work the honing grooves were modelled and the effect they have on film formation and cavitation investigated. However, their effect on the distribution and retention of oil on the liner could not be seen due to the fully flooded inlet condition. With the incorporated oil availability model the effect of different honing groove patterns can be further investigated.

Place, publisher, year, edition, pages
2011.
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-29731Local ID: 34c187fd-d2c6-4204-95c2-f0ae57e75f57OAI: oai:DiVA.org:ltu-29731DiVA, id: diva2:1002957
Conference
Leeds-Lyon Symposium on Tribology : 06/09/2011 - 09/09/2011
Note
Godkänd; 2011; 20111213 (spencer)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved

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Spencer, AndrewAlmqvist, AndreasLarsson, Roland

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