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Research Papers: Hydrodynamic Lubrication

Behavior of a Two-Lobe Journal Bearing With a Scratched Shaft: Comparison Between Theory and Experiment

[+] Author and Article Information
Jean Bouyer, Michel Fillon

Pprime Institute,
CNRS, Université de Poitiers, ISAE-ENSMA,
Futuroscope Chasseneuil F-86962, France

Mathieu Helene, Jérôme Beaurain

EDF Lab Paris-Saclay,
Bd Gaspard Monge, 91120 Palaiseau, France

Célia Giraudeau

Pprime Institute,
CNRS, Université de Poitiers, ISAE-ENSMA,
Futuroscope Chasseneuil F-86962, France;
EDF Lab Paris-Saclay,
Bd Gaspard Monge, 91120 Palaiseau, France

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received May 24, 2018; final manuscript received August 23, 2018; published online October 16, 2018. Assoc. Editor: Alan Palazzolo.

J. Tribol 141(2), 021702 (Oct 16, 2018) (10 pages) Paper No: TRIB-18-1202; doi: 10.1115/1.4041363 History: Received May 24, 2018; Revised August 23, 2018

Using the experience acquired within our lab in terms of both thermohydrodynamic (THD) and thermoelastohydrodynamic (TEHD) numerical simulations, a new THD code has been improved 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.

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References

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Figures

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Fig. 1

Scheme for coupling of EDYOS/Code_Aster

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Fig. 2

(a) Layout of the test rig and (b) layout of the loading system

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Fig. 3

Layout of the two-lobe journal bearing

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Fig. 10

Comparison of experimental data and numerical values for a journal bearing configuration with a scratch of depth 2C, at 3500 rpm and 6000 N: (a) midplane pressure of the lower lobe, (b) axial pressure at 185 deg in the circumferential direction of the lower lobe, (c) midplane temperature of the lower lobe, and (d) axial temperature at 180 deg in the circumferential direction of the lower lobe

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Fig. 4

Boundary conditions applied to the different solid parts of the journal bearing

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Fig. 8

Comparison of experimental data and numerical values for a journal bearing configuration with a scratch of depth C/2, at 3500 rpm and 6000 N: (a) midplane pressure of the lower lobe, (b) axial pressure at 185 deg in the circumferential direction of the lower lobe, (c) midplane temperature of the lower lobe, and (d) axial temperature at 180 deg in the circumferential direction of the lower lobe

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Fig. 9

Comparison between experimental data and numerical values for a journal bearing configuration with a scratch of depth C, at 3500 rpm and 6000 N: (a) midplane pressure of the lower lobe, (b) axial pressure at 185 deg in the circumferential direction of the lower lobe, (c) midplane temperature of the lower lobe, and (d) axial temperature at 180 deg in the circumferential direction of the lower lobe

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Fig. 11

Effect of hydrostatic bearing on scratched journal bearing

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Fig. 5

Comparison of experimental data and numerical values for configuration without scratching at 3500 rpm and 6000 N: (a) midplane pressure of the lower lobe, (b) midplane pressure of the upper lobe, (c) axial pressure at 185 deg in the circumferential direction of the lower lobe, (d) midplane temperature of the lower lobe, (e) midplane temperature of the upper lobe, and (f) axial temperature at 180 deg in the circumferential direction of the lower lobe

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Fig. 6

Temperature distribution in the bushing at 3500 rpm and 6000 N

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Fig. 7

Combined thermal and mechanical displacement distribution in the bushing at 3500 rpm and 6000 N: (a) X→ direction and (b) Y→ direction

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Fig. 12

Schematic view of the misalignment

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Fig. 13

Comparison of experimental data and numerical values with and without balanced momentum for a journal bearing configuration with a scratch (depth 2C) at 3500 rpm and 6000 N: (a) midplane pressure of the lower lobe, (b) axial pressure at 185 deg in the circumferential direction of the lower lobe, (c) midplane temperature of the lower lobe, and (d) axial temperature at 180 deg in the circumferential direction of the lower lobe

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