A Thermohydrodynamic Analysis of Foil Journal Bearings

[+] Author and Article Information
Z-C. Peng1

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803

M. M. Khonsari2

Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803Khonsari@me.lsu.edu


Currently with Department of Mechanical Engineering at Georgia Institute of Technology, Atlanta, GA 30332.


Corresponding author.

J. Tribol 128(3), 534-541 (Feb 16, 2006) (8 pages) doi:10.1115/1.2197526 History: Received July 24, 2005; Revised February 16, 2006

A thermohydrodynamic model is developed for predicting the three-dimensional (3D) temperature field in an air-lubricated, compliant foil journal bearing. The model accounts for the compressibility and the viscosity-temperature characteristic of air and the compliance of the bearing surface. The results of numerical solutions are compared to published experimental measurements and reasonable agreement has been attained. Parametric studies covering a fairly wide range of operating speeds and load conditions were carried out to illustrate the usefulness of the model in terms of predicting the thermal performance of foil journal bearings.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Schematic of a foil bearing

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Figure 2

Foil structures and velocity components of the air flow inside the bearing

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Figure 3

Schematic of the region where recirculating air mixes with fresh air (shaded plane is the symmetric plane)

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Figure 4

Pressure profile of the bearing with ω=30krpm and W=1110N

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Figure 5

Pressure profile and corresponding film geometry of a foil bearing compared with a same sized rigid bearing (ω=30krpm, hmin=16μm)

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Figure 7

Temperature profile and film geometry of a foil bearing and a same sized rigid bearing operating under the same minimum film thickness (ω=30krpm, hmin=16μm, hconv=145W∕m2∙K)

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Figure 8

Prediction of temperature rise under different thermal boundary conditions (hmin=25μm)

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Figure 9

Comparison of load-carrying capacity from THD analysis and isothermal hydrodynamic analysis (hmin=25μm, hconv=100W∕m2∙K)

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Figure 6

Temperature profile of the midlayer air in the foil bearing (ω=30krpm, W=1110N, hconv=145W∕m2∙K)



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