Research Papers: Gas Turbines: Vehicular and Small Turbomachines

The Wing Foil: A Novel Compliant Radial Foil Bearing Design

[+] Author and Article Information
Erik E. Swanson

Xdot Engineering and Analysis,
705 Dale Avenue,
Charlottesville, VA 22903
e-mail: erik@xdotea.com

P. Shawn O'Meara

Xdot Engineering and Analysis,
705 Dale Avenue,
Charlottesville, VA 22903
e-mail: shawn@xdotea.com

1Corresponding author.

Contributed by the Vehicular and Small Turbomachines Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 26, 2017; final manuscript received August 30, 2017; published online April 26, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(8), 082701 (Apr 26, 2018) (7 pages) Paper No: GTP-17-1400; doi: 10.1115/1.4038366 History: Received July 26, 2017; Revised August 30, 2017

To meet the challenging demands for high performance, affordable compliant foil bearings (CFBs), a novel compliant support element has been developed. This recently patented, novel support element uses a multidimensional array of multiple, formed, cantilever “wing foil” tabs. The wing foil bearing has all the features required to achieve state-of-the-art performance (Gen III for radial bearings). This paper describes two radial foil bearings using the wing foil and the unique design features. Test data for a 31.75 mm diameter bearing operating in air and in steam up to 42 krpm are presented to demonstrate the performance of this bearing. It is shown to have low subsynchronous vibration and reasonable damping through rigid shaft critical speeds.

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Fig. 1

Prototypical overlapped leaf style bearing

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Fig. 2

Prototypical bump style bearing

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Fig. 3

Flexed beam style bearing (from Ref. [13])

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Fig. 4

Wing foil compliant element (from Ref. [14])

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Fig. 5

31.75 mm prototype 1 test setup

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Fig. 6

Three-tapered lobe concept (exaggerated)

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Fig. 7

31.75 mm prototype, second configuration

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Fig. 8

31.75 mm bearing load deflection

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Fig. 9

31.75 mm rotordynamic simulator

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Fig. 10

31.75 mm bearing rotordynamic simulator cross section

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Fig. 11

Simulator first three critical speeds

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Fig. 12

42 krpm response, air

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Fig. 13

42 krpm response, steam

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Fig. 14

Coast-down order track, steam

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Fig. 15

Predicted unbalance response (with tuned bearing stiffness)



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