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TECHNICAL PAPERS

Analysis and Test of a Robust Sector Thrust Bearing for a Cryogenic Turboalternator

[+] Author and Article Information
G. F. Nellis

Mechanical Engineering Dept., University of Wisconsin, Madison, WI 53706e-mail: gfnellis@engr.wisc.edu

M. V. Zagarola, H. Sixsmith

Creare Incorporated, Etna Road, P.O. Box 71, Hanover, NH 03755

J. Tribol 123(4), 768-776 (Feb 20, 2001) (9 pages) doi:10.1115/1.1387037 History: Received October 31, 2000; Revised February 20, 2001
Copyright © 2001 by ASME
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References

McCormick, J. A., Nellis, G. F., Swift, W. L., Sixsmith, H., and Reilly, J., 1999, “Design and Test of Low Capacity Reverse Brayton Cryocooler Refrigeration at 35 K and 60 K,” Proc. 10th Inernational Cryocooler Conference, R. G. Ross, ed., Kluwer Academic/Plenum Publishing, New York, pp. 421–429.
Nellis,  G. F., McCormick,  J., Sixsmith,  H., and Swift,  W. L., 1998, “Turbo Brayton Coolers for a Range of Loads and Temperatures,” Proc. of SPIE, Infrared Technology and Applications XXIV, ., eds., SPIE, The International Society for Optical Engineering Publishing, Bellingham, WA, Volume 3435, No. 2, pp. 813–823.
Swift,  W. L., Zagarola,  M. V., Nellis,  G. F., McCormick,  J. A., Sixsmith,  H., and Gibbon,  J. A., 1999, “Developments in TurboBrayton Technology for Low Temperature Applications,” Cryogenics, 39, 989–995.
Cheng, H. S., Chow, C. Y., and Murray, S. F., 1965, “Gas Bearing Design Charts Volume 1: The Hydrodynamic Gas Journal Bearing and The Hydrodynamic Gas Thrust Bearing,” Technical Report No. MTI-65TR5-II, Mechanical Technology Incorporated, Latham, NY.
Whipple, R. T. P., 1958, “The Inclined Groove Bearing,” Atomic Energy Research Establishment Technical Report No. 622, Harwell.
Whitley, S., and Williams, L. G., 1959, “The Gas Lubricated Spiral-Groove Thrust Bearing,” U. K. A. E. A., I. G., Technical Report No. 28 RD/CA.
Ausman,  J. S., 1961, “An Approximate Analytical Solution for Self-ActingGas Lubrication of Stepped Sector Thrust Bearings,” ASLE Trans., 4, pp. 304–313.
Grassam, N. S., and Powell, J. W., eds., 1964, Gas Lubricated Bearings, Butterworths, London.
Walker,  L., and Osterle,  F., 1961, “A Centrifugal Effect Self-Acting Thrust Bearing,” ASLE Trans., 4, pp. 287–292.
Razzague,  M. M., and Takahisa,  K., 1999, “Effects of Groove Orientation on Hydrodynamic Behavior of Wet Clutch Coolant Films,” ASME J. Tribol., 121, pp. 56–61.
Incropera, F. P., and DeWitt, D. P., 1990, Fundamentals of Heat and Mass Transfer, 3rd ed., John Wiley & Sons, New York.
Rohsenow, W. M., Hartnett, J. P., and Cho, Y. I., eds., 1998, Handbook of Heat Transfer, 3rd ed., McGraw-Hill, New York.

Figures

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Schematic of inertial thrust bearing
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Operating mechanism of inertial thrust bearing
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Description of robust sector thrust bearing geometry
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(a) Nondimensional pressure distribution for typical high viscosity, low density operating condition; (b) nondimensional flows at typical high viscosity, low density operating condition; and (c) nondimensional pressure distribution for typical high viscosity, low density operating condition; clearance reduced by 50 percent.
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(a) Nondimensional pressure distribution for typical low viscosity, high density operating condition; (b) nondimensional flows at typical low viscosity, high density operating condition; and (c) nondimensional pressure distribution for typical low viscosity, high density operating condition; clearance reduced by 50 percent.
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Contours of nondimensional stiffness as a function of bearing number and gap Reynolds number and the path of the prototypical thrust bearing design
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Schematic of thrust bearing test facility
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Measured stiffness as a function of rotational speed
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Measured and predicted nondimensional stiffness as a function of bearing number

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