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Title: Big end bearing losses with thermal cavitation flow under cylinder deactivation
Authors: Shahmohamadi, Hamed
Rahmani, Ramin
Rahnejat, Homer
Garner, Colin P.
Dowson, D.
Keywords: Internal combustion engines
Journal bearings
Mixed thermohydrodynamics
Navier–Stokes Cavitation
Cylinder deactivation
Lis
Issue Date: 2015
Publisher: © The Author(s). This article is published with open access at Springerlink.com
Citation: SHAHMOHAMADI, H. ... et al., 2015. Big end bearing losses with thermal cavitation flow under cylinder deactivation. Tribology Letters, 57 (2), 17pp. DOI: 10.1007/s11249-014-0444-7
Abstract: The paper presents a mixed thermo-hydrodynamic analysis of elliptic bore bearings using combined solution of Navier–Stokes, continuity and energy equations for multi-phase flow conditions. A vapour transport equation is also included to ensure continuity of flow in the cavitation region for the multiple phases as well as Rayleigh–Plesset to take into account the growth and collapse of cavitation bubbles. This approach removes the need to impose artificial outlet boundary conditions in the form of various cavitation algorithms which are often employed to deal with lubricant film rupture and reformation. The predictions show closer conformance to experimental measurements than have hitherto been reported in the literature. The validated model is then used for the prediction of frictional power losses in big end bearings of modern engines under realistic urban driving conditions. In particular, the effect of cylinder deactivation (CDA) upon engine bearing efficiency is studied. It is shown that big-end bearings losses contribute to an increase in the brake specific fuel consumption with application of CDA contrary to the gains made in fuel pumping losses to the cylinders. The study concludes that implications arising from application of new technologies such as CDA should also include their effect on tribological performance.
Description: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
Sponsor: The authors would like to express their gratitude to the Lloyd’s Register Foundation (LRF) for the financial support extended to this research.
Version: Published
DOI: 10.1007/s11249-014-0444-7
URI: https://dspace.lboro.ac.uk/2134/17149
Publisher Link: http://dx.doi.org/10.1007/s11249-014-0444-7
ISSN: 1023-8883
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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