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RESEARCH PAPERS

Turbulent Flow, Flexure-Pivot Hybrid Bearings for Cryogenic Applications

[+] Author and Article Information
Luis San Andres

Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-2123

J. Tribol 118(1), 190-200 (Jan 01, 1996) (11 pages) doi:10.1115/1.2837077 History: Revised June 15, 1993; Received January 24, 1995; Online January 24, 2008

Abstract

The thermal analysis of flexure-pivot tilting-pad hybrid (combination hydrostatic-hydrodynamic) bearings for cryogenic turbopumps is presented. The advantages of this type of bearing for high speed operation are discussed. Turbulent bulk-flow, variable properties, momentum and energy transport equations of motion govern the flow in the bearing pads. Zeroth-order equations for the flow field at a journal equilibrium position render the bearing flow rate, load capacity, drag torque, and temperature rise. First-order equations for perturbed flow fields due to small amplitude journal motions provide rotordynamic force coefficients. A method to determine the tilting-pad moment coefficients from the force displacement coefficients is outlined. Numerical predictions correlate well with experimental measurements for tilting-pad hydrodynamic bearings. The design of a liquid oxygen, flexure-pad hybrid bearing shows a reduced whirl frequency ratio and without loss in load capacity or reduction in direct stiffness and damping coefficients.

Copyright © 1996 by The American Society of Mechanical Engineers
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