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research-article

Behavior of a two-lobe journal bearing with a scratched shaft: Comparison between theory and experiment

[+] Author and Article Information
Jean Bouyer

Pprime Institute, CNRS, Université de Poitiers, ISAE-ENSMA, F-86962 Futuroscope Chasseneuil, France
jean.bouyer@univ-poitiers.fr

Michel Fillon

Pprime Institute, CNRS, Université de Poitiers, ISAE-ENSMA, F-86962 Futuroscope Chasseneuil, France
michel.fillon@univ-poitiers.fr

Mathieu Hélène

EDF Lab Paris-Saclay, Palaiseau, France
mathieu.helene@edf.fr

Jerome Beaurain

EDF Lab Paris-Saclay, Palaiseau, France
jerome.beaurain@edf.fr

Célia Giraudeau

Pprime Institute, CNRS, Université de Poitiers, ISAE-ENSMA, F-86962 Futuroscope Chasseneuil, France; EDF Lab Paris-Saclay, Palaiseau, France
celia.giraudeau@hotmail.fr

1Corresponding author.

ASME doi:10.1115/1.4041363 History: Received May 24, 2018; Revised August 23, 2018

Abstract

Using the experience acquired within our lab in terms of both thermohydrodynamic (THD) and thermoelastohydrodynamic (TEHD) numerical simulations, we improve a new THD code by adding the possibility of taking into account geometrical defects, and particularly scratches, which are often discovered by turbine users during maintenance operations. To examine this issue, two numerical codes were coupled to provide the TEHD analysis presented in this work. To validate the numerical results, experimental tests were conducted using the Pprime Institute bearing test rig. The performance of the same two-lobe journal bearing (preload 0.524) as used in a previous study, lubricated with ISO VG 46 oil, was evaluated. Scratches of different depths (varying as a function of the radial clearance) were directly machined onto the shaft. TEHD solutions and experimental data were compared for various rotational speeds and applied loads. Pressure and temperature comparisons for the three scratch depths show good correlation, and give the expected results for cases with a scratch. It was also found that the asymmetry in the pressure field created by the presence of a scratch led to a slight misalignment. The comparisons were improved by taking into account this misalignment, using the balance of momentum.

Copyright (c) 2018 by ASME
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