Air foil bearings (AFBs) have been recognized as the most promising for oil-free turbomachinery. However, the applications of AFBs to the relatively large turbomachinery have many technical challenges due to limited load capacity and wear during start/stops. A hybrid air foil bearing (HAFB), which combines the benefits of AFB and hydrostatic air bearing, was introduced earlier by the authors, and the experimental studies showed much larger load capacity at low speeds and much lesser friction torque during start/stop than hydrodynamic counterpart. The benefit of HAFB was recognized through the experimental studies, and the concept of hybrid operation was further developed to thrust air foil bearings. This paper presents novel design features of the hybrid air foil thrust bearing (HAFTB) with radially arranged bump foils and preformed Rayleigh step contour, and presents simulated static and dynamic characteristics of the HAFTB. A 2D thin plate equation in cylindrical coordinate was solved with the finite difference method for the prediction of the top foil deflection. Parametric studies were performed to evaluate the effect of various design parameters on the static and dynamic performances of HAFTB. At low speeds, a design with orifice located at the center of land region showed the highest load capacity, while a design with orifice located near the leading edge of land region showed the highest load capacity at high speeds. Direct and coupled bearing coefficients were also calculated for various operating conditions. The direct stiffness increases with supply pressure but the direct damping decreases with supply pressure. In addition, typical hardening effect of gas film accompanying increase of stiffness and decrease of damping was predicted in high frequency excitations.
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e-mail: daejongkim@uta.edu
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April 2011
Research Papers
Design and Performance Prediction of Hybrid Air Foil Thrust Bearings
Donghyun Lee,
Donghyun Lee
Mechanical and Aerospace Engineering,
University of Texas at Arlington
, 500 West 1st Street, Arlington, TX 76019
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Daejong Kim
Daejong Kim
Mechanical and Aerospace Engineering,
e-mail: daejongkim@uta.edu
University of Texas at Arlington
, 500 West 1st Street, Arlington, TX 76019
Search for other works by this author on:
Donghyun Lee
Mechanical and Aerospace Engineering,
University of Texas at Arlington
, 500 West 1st Street, Arlington, TX 76019
Daejong Kim
Mechanical and Aerospace Engineering,
University of Texas at Arlington
, 500 West 1st Street, Arlington, TX 76019e-mail: daejongkim@uta.edu
J. Eng. Gas Turbines Power. Apr 2011, 133(4): 042501 (13 pages)
Published Online: November 18, 2010
Article history
Received:
November 4, 2009
Revised:
June 21, 2010
Online:
November 18, 2010
Published:
November 18, 2010
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Citation
Lee, D., and Kim, D. (November 18, 2010). "Design and Performance Prediction of Hybrid Air Foil Thrust Bearings." ASME. J. Eng. Gas Turbines Power. April 2011; 133(4): 042501. https://doi.org/10.1115/1.4002249
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