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RESEARCH PAPERS

Combined Navier–Stokes and Bulk-Flow Analysis of Hybrid Bearings: Radial and Angled Injection

[+] Author and Article Information
M. Hélène, M. Arghir, J. Frêne

 Université de Poitiers, Laboratoire de Mécanique des Solides—UMR CNRS 6610, Faculté des Sciences, SP2MI, Boulevard Marie et Pierre Curie, BP 30179, 86962 Futuroscope Chasseneuil Cedex, France

J. Tribol 127(3), 557-567 (Aug 26, 2004) (11 pages) doi:10.1115/1.1924426 History: Received February 20, 2004; Revised August 26, 2004

The present work deals with the Navier–Stokes and bulk-flow analysis of hybrid bearings intended for use in aerospace applications. These bearings are expected to work at high rotational speeds and high feeding pressures. In such a case, the pressure in the shallow pockets of the bearing is no longer constant and is influenced by hydrostatic and hydrodynamic effects. It has been shown in the literature that the recess pressure pattern can have an important influence on the dynamic characteristics of the bearing. The present work investigates the pressure field in the recess of centered hybrid bearings with radial and angled injection by using a numerical Navier–Stokes analysis. The recess pressure pattern is then subsequently characterized by combining these results with some parametric descriptions. For calculating the dynamic characteristics of the bearing, the parametric pressure pattern is then injected into a bulk-flow model. The proposed model is an alternative analysis to the one advanced by San Andrés [ASME J. Tribole, 112, pp. 699–707; 119, 179–187] and in order to evaluate the validity of the bulk-flow code, the numerical predictions are compared with experimental data taken from the literature for radial and angled injection. The favourable effect of the counter-rotating angled injection is then explained by using the velocity field issued from the Navier–Stokes analysis and the pressure field given by the bulk-flow model.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry of a hydrostatic journal bearing showing the bulk flow model boundary conditions

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Figure 2

Computational domain and boundary conditions

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Figure 3

Rotor pressure (Ps=40bars;Ω=10200rpm)

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Figure 4

Pressure variation in the pocket symmetry plane (Psupply=40bars;Ω=10200rpm)

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Figure 5

Literature pressure patterns

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Figure 6

Present analysis pressure pattern

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Figure 7

Pressures in the pocket and in the film land

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Figure 8

Variation of the recess edge pressure loss coefficient ξ

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Figure 9

Variation of ξh (pressure rise in downstream part of the recess)

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Figure 10

Velocity vectors in the mid plane of the film land

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Figure 11

Qualitative representation of turbulent velocity profiles in the film land

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Figure 12

Variation of VAt∕VAn

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Figure 13

Estimated 3D pressure distribution (Psupply=55bars;Ω=17400rpm)

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Figure 14

Systematic comparison between 3D N.S. results and parametric pattern (radial injection)

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Figure 15

Systematic comparison between 3D N.S. results and parametric pattern (45deg angled injection)

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Figure 16

Dynamic coefficients for radial injection

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Figure 17

Dynamic coefficients for angled injection

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Figure 18

Average circumferential velocity in the film land

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Figure 19

Influence of radial injection on the pressure distribution

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Figure 20

Influence of radial injection on the pressure distribution

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