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Research Papers: Gas Turbines: Structures and Dynamics

A Fully Coupled Fluid–Structure Interaction Model for Foil Gas Bearings

[+] Author and Article Information
Wei Zhang

United Technologies Research
Center (China) Ltd.,
Room 3502,
35/F, Kerry Parkside Office,
1155 Fang Dian Road, Pudong,
Shanghai 201204, China
e-mail: Wei.zhang@utrc.utc.com

Abbas A. Alahyari

United Technologies Research Center,
411 Silver Lane,
East Hartford, CT 06108
e-mail: AlahyaAA@utrc.utc.com

Louis Chiappetta

United Technologies Research Center,
411 Silver Lane,
East Hartford, CT 06108
e-mail: ChiappL@utrc.utc.com

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received August 11, 2015; final manuscript received August 28, 2015; published online September 13, 2016. Editor: David Wisler.

J. Eng. Gas Turbines Power 139(2), 022501 (Sep 13, 2016) (5 pages) Paper No: GTP-15-1404; doi: 10.1115/1.4034343 History: Received August 11, 2015; Revised August 28, 2015

Foil gas bearings are self-acting, compliant-surface hydrodynamic bearings that usually use air or other process gas as their working fluid or lubricant. Foil gas bearings are made of one or more bump foils, which are compliant surfaces of corrugated metal, and one or more layers of top foil. Because foil gas bearing performance parameters, such as load capacity, are dominated by foil material and foil geometric designs, numerical models have been developed to predict the bearing's performance based on these characteristics. However, previous models often simplify bump foil as elastic foundation with constant stiffness and neglect top foil altogether. Further, they typically use the Reynolds equation to simplify the fluid solution. In this study, ansys software is used to build a 3D, fully coupled, fluid–structure interaction (FSI) model for a foil gas bearing to predict the key performance parameters such as load capacity and journal attitude angle. The model's results show good agreement with previously published test data. This not only demonstrates the feasibility of 3D fully coupled fluid–structure interaction model for a conventional foil bearing using commercial codes, but also shows modeling capability for future generations of foil gas bearing.

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References

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Figures

Grahic Jump Location
Fig. 2

Cross section view of 3D fully coupled FSI FGB model

Grahic Jump Location
Fig. 4

Film thickness distribution at bearing midplane

Grahic Jump Location
Fig. 5

Expanded view of top foil radial deformation

Grahic Jump Location
Fig. 3

Fully coupled FSI model approach

Grahic Jump Location
Fig. 1

Schematic example of bump-type first-generation foil gas bearings with axially and circumferentially uniform elastic support elements [1]

Grahic Jump Location
Fig. 6

Minimum film thickness versus static load, predictions and test data compared for bearing L/D = 1 [18]

Grahic Jump Location
Fig. 7

Journal attitude angle versus static load, predictions and test data for bearing with L/D = 1 [18]

Grahic Jump Location
Fig. 8

Minimum film thickness versus static load, predictions and test data for bearing with L/D = 1/2 [18]

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