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Thermohydrodynamic analysis of a journal bearing with a microgroove on the shaft
KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.). (System- O Komponentdesign)
2014 (English)In: Computational Thermal Sciences, ISSN 1940-2503, E-ISSN 1940-2554, Vol. 6, no 1, 47-57 p.Article in journal (Refereed) Published
Abstract [en]

In this study, thermohydrodynamic performance of a journal bearing with a microgroove created on the shaft is analyzed. A plain journal bearing is modeled using a computational fluid dynamics (CFD) software package. Navier-Stokes and energy equations are solved. The rotor-stator interaction is treated by using a computational grid deformation technique. The goal is to examine the pressure/temperature distribution in the bearing film. Results are presented in terms of typical bearing parameters as well as flow patterns. Results are also compared to the bearing with a smooth shaft. The effect induced by a microgroove on pressure distribution is explained for different bearing configurations, eccentricities, and microgroove depths. It is shown that the microgroove produces a local drop in pressure which, averaged over one revolution, decreases the load carrying capacity. The load carrying capacity is further decreased by using deeper microgrooves. With thermal effects considered, the microgroove carries more cold lubricant into the warmest regions of the bearing. This effect, more pronounced with deeper microgrooves, is due to a global flow recirculation inside the microgroove, which improves mixing.

Place, publisher, year, edition, pages
2014. Vol. 6, no 1, 47-57 p.
Keyword [en]
CFD, Grid update, Journal bearing, Microgroove motion, Thermal effects
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-161774DOI: 10.1615/ComputThermalScien.2014005894ScopusID: 2-s2.0-84897783176OAI: diva2:795655

QC 20150317

Available from: 2015-03-17 Created: 2015-03-17 Last updated: 2015-03-17Bibliographically approved

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Glavatskih, Sergei
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Machine Design (Dept.)
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