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Title: Assessment of friction from compression ring conjunction of a high performance internal combustion engine: a combined numerical and experimental study
Authors: Gore, Michael
Rahmani, Ramin
Rahnejat, Homer
King, P.D.
Keywords: In-cycle friction
Floating liner
Compression ring
Viscous friction
Boundary friction
Cylinder deactivation
Issue Date: 2015
Publisher: SAGE Publications/© IMechE 2015
Citation: GORE, M. ...et al., 2015. Assessment of friction from compression ring conjunction of a high performance internal combustion engine: a combined numerical and experimental study. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 230 (12), pp.2073-2085
Abstract: The paper presents direct measurement of in-cylinder friction from a single cylinder motocross race engine under motored conditions and compares the same with a new analytical predictive method. These conditions are encountered in piston-cylinder system with the application of cylinder deactivation (CDA) technology, which is a growing trend. The analytical method takes into account the various regions within instantaneous contact of compression ring-cylinder liner, including lubricant film rupture, cavitation zone and the subsequent lubricant film reformation. The analysis also includes the effect of boundary friction and lubricant rheology. The predictions and direct measurements of cyclic friction show good agreement and indicate dominance of viscous friction under the investigated engine running conditions. In particular, it is shown that the compression ring contribution to in-cycle friction is most pronounced in the region of high cylinder pressures because of combined Poiseuille friction and some boundary solid interactions. The combined experimental-analytical approach has not hitherto been reported in literature
Description: This is an Open Access article licensed under a Creative Commons Attribution 3.0 Unported Licence.
Sponsor: The authors would like to express their gratitude to the Engineering and Physical Sciences Research Council (EPSRC) for the sponsorship of this research under the Encyclopaedic Program Grant (www.encyclopaedic.org).
Version: Published
DOI: 10.1177/0954406215588480
URI: https://dspace.lboro.ac.uk/2134/18413
Publisher Link: http://dx.doi.org/10.1177/0954406215588480
ISSN: 2041-2983
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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