Affiliation:
1. Department of Mechanical Engineering, Texas A&M University, College Station, TX 77843-2123
Abstract
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.
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference51 articles.
1. Armentrout
R.
,
and
PaquetteD.,
1993, “Rotordynamic Characteristics of
Flexure-Pivot Tilting Pad Journal Bearings,” STLE
Tribology Transactions, Vol. 36, No.
3, pp.
443–451.
2. Arumugam, P., Swarnamani, S., and Prabhu, B. S.,
1994, “Experimental Identification of Linearized Oil Film Coefficients of
Cylindrical and Tilting Pad Bearings,” ASME Paper 94-GT-81.
3. Barrett
L.
E.
, AllaireP.
E., and
WilsonB.
W., 1988,
“The Eigenvalue Dependence of Reduced Tilting Pad Bearing
Stiffness and Damping Coefficients,” STLE Tribology
Transactions, Vol. 31, No. 4, pp.
411–419.
4. Bouard, L., Fillon, M., and Frene, J., 1994,
“Comparison Between Three Turbulent Models-Application to Thermohydrodynamic
Performances of Tilting-Pad Bearings,” International Tribology Conference,
AUSTRIB ’94, Perth, Australia, Dec., pp. 119–126.
5. Brockwell
K.
,
and
KleibubD.,
1989, “Measurement of the Steady State Operating
Characteristics of the Five Shoe Tilting Pad Journal
Bearing,” STLE Tribology Transactions, Vol.
32, No. 2, pp.
267–275.
Cited by
32 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献