Experimental Study of the Influence of Scratches on the Performance of a Two-Lobe Journal Bearing

During maintenance operations of steam turbines, a common issue is the degradation of the supporting and guiding components for the rotating shafts due to the presence of scratches. To examine this issue, a numerical software program has been developed. In order to validate and complete the elaborat...

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Bibliographic Details
Published in:Tribology transactions 2017-09, Vol.60 (5), p.942-955
Main Authors: Giraudeau, Célia, Bouyer, Jean, Fillon, Michel, Hélène, Mathieu, Beaurain, Jérôme
Format: Article
Language:English
Subjects:
experiments
Journal bearing
pressure
scratches
thermal effects
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Summary:During maintenance operations of steam turbines, a common issue is the degradation of the supporting and guiding components for the rotating shafts due to the presence of scratches. To examine this issue, a numerical software program has been developed. In order to validate and complete the elaborated modeling, experimental tests have been carried out on the Pprime Institute test bench. A preloaded two-lobe journal bearing (diameter: 100 mm, length: 68.4 mm, preload: 0.524) lubricated with an ISO VG 46 mineral oil has been tested. Scratches were machined on the shaft at two axial locations and at different depths. Pressures and temperatures have been measured for several rotational speeds and applied loads. Seven configurations (one unscratched surface and six with a scratch) have been tested in order to evaluate the influence of a scratch on the performance of the bearing. It is found that the pressure profile is significantly affected by the presence of a scratch, whereas the temperature field is weakly modified.
ISSN:1040-2004
1547-397X
DOI:10.1080/10402004.2016.1238528