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Experimental Study on the Load Carrying Performance and Driving Torque of Gas Foil Thrust Bearings
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  • Journal title : Tribology and Lubricants
  • Volume 31, Issue 4,  2015, pp.141-147
  • Publisher : The Korean Society of Tribologists and Lubrication Engineers
  • DOI : 10.9725/kstle.2015.31.4.141
 Title & Authors
Experimental Study on the Load Carrying Performance and Driving Torque of Gas Foil Thrust Bearings
Kim, Tae Ho; Lee, Tae Won; Park, Moon Sung; Park, Jungmin; Kim, Jinsung; Jeong, Jinhee;
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 Abstract
Gas foil thrust bearings (GFTBs) have attractive advantages over rolling element bearings and oil film thrust bearings, such as oil-free operation, high speed stability, and high-temperature operation. However, GFTBs have lower load carrying capacity than the other two types of bearings owing to the inherent low gas viscosity. The load carrying capacity of GFTBs depends mainly on the compliance of the foil structure and the formed hydrodynamic wedge, where the gas pressure field is generated between the top foil and the thrust runner. The load carrying capacity of the GFTBs is very important for the suitable design of oil-free turbomachinery with high performance. The aim of the present study is to identify the characteristics of the load carrying performance of GFTBs. A new test rig for the experimental measurements is designed to provide static loads up to 800 N using a pneumatic cylinder. The maximum operating speed of the driving motor is 30,000 rpm. A series of experimental tests—lift-off test, static load performance test, and maximum load capacity test—estimate the performance of a six-pad GFTB, in terms of the static load, driving torque, and temperature. The maximum load capacity is determined by increasing the static load until the driving torque rises suddenly with a sharp peak. The test results show that the torque and temperature increase linearly with the static load. The estimated maximum load capacity per unit area is approximately 80.5 kPa at a rotor speed of 25,000 rpm. The test results can be used as a design guideline for GFTBs for realizing oil-free turbomachinery.
 Keywords
gas foil thrust bearing;lift-off test;load capacity;driving torque;temperature;
 Language
Korean
 Cited by
 References
1.
Iordanoff, I., “Maximum Load Capacity Profiles for Gas Thrust Bearings Working Under High Compressibility Number Conditions”, ASME J. Tribol., Vol. 120, No. 3, pp. 571-576, 1998. crossref(new window)

2.
Iordanoff, I., “Analysis of an Aerodynamic Compliant Foil Thrust Bearing: Method for a Rapid Design”, ASME J. Tribol., Vol. 121, No. 4, pp. 816-822, 1999. crossref(new window)

3.
Heshmat, C. A., Xu, D. S., Heshmat, H., “Analysis of Gas Lubricated Foil Thrust Bearings Using Coupled Finite Element and Finite Difference Methods,” ASME J. Tribol., Vol. 122, No. 1, pp. 199-204, 2000. crossref(new window)

4.
Hryniewicz, P., Locke, D. H., Heshmat, H., “New-Generation Development Rigs for Testing High-Speed Air-Lubricated Thrust Bearings,” STLE Tribol. Trans., Vol. 46, No. 4, pp.556-559, 2003. crossref(new window)

5.
Jung, S. Y., “The Limiting Load Capacity of Air Foil Thrust Bearings,” J. Korean Soc. Tribol. Lubr. Eng., Vol. 25, No. 5, pp. 279-284, 2009.

6.
Kim, T. Y., Park, D. J., Lee, Y. B., “A Study of Load Capacity of Air Foil Thrust Bearings”, J. Korean Soc. Tribol. Lubr. Eng., Vol. 25, No. 5, pp. 292-297, 2009.

7.
Lee, Y, B., Kim, T, Y., Kim, C, H., Kim, T, H., “Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments”, STLE Tribol. Trans., 54, pp. 902-910, 2011. crossref(new window)

8.
Kim, T. H., Lee, Y. B., Kim, T. Y., Jeong, K. H., “Rotordynamic Performance of an Oil-Free Turbo Blower Focusing on Load Capacity of Gas Foil Thrust Bearings,” ASME J. Eng. Gas Turbines Power, Vol. 134, No. 2, pp. 022501, 2011.

9.
San Andrès, L., Ryu, K., Diemer, P., “Prediction of Gas Thrust Foil Bearing Performance for Oil-Free Automotive Turbochargers”, ASME J. Eng. Gas Turbines Power, Vol. 137, No. 3, pp. 032502, 2014. crossref(new window)

10.
Kim, T. H., Lee, T. W., “Design Optimization of Gas Foil Thrust Bearings for Maximum Load Capacity”, ASME Paper No. GT2015-43999, 2015.