DESIGN OF LIQUID METAL LUBRICATED BEARINGS. VOLUME 2. AN EXPERIMENTAL INVESTIGATION OF NaK LUBRICATED TILTING PAD BEARINGS. Final Report.

The presented analytical consideration of tilting-pad bearings incorporates simultaneously the changes in viscosity (due to viscous dissipation) and in the nonambient inlet pressure (due to momentum depletion within the fore-region). The solution provides the following quantities: film temperature distributions, pressure distribution, maximum temperature of the pad, load capacity, friction force, coordinate of the center of pressure, and coordinate of the pivot point. Comparison with the case when the inlet pressure is assumed to be ambient indicates the significance of the pressure build-up in the fore-region.

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Identifying technology barriers in adapting a state-of-the-art gas turbine for IGCC applications and an experimental investigation of air extraction schemes for IGCC operations. Final report

10.2172/10108364 ◽

1993 ◽

Author(s):

Tah-teh Yang ◽

A.K. Agrawal ◽

J.S. Kapat

Keyword(s):

Experimental Investigation ◽

Gas Turbine ◽

State Of The Art ◽

Final Report ◽

Technology Barriers

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Thermo-hybrid lubrication FSI-CFD model for the static characteristics of hybrid porous tilting pad bearings

Tribology International ◽

10.1016/j.triboint.2021.107397 ◽

2021 ◽

pp. 107397

Author(s):

Xiaofei Jin ◽

Peng Xia ◽

Zhansheng Liu ◽

Wensheng Ma ◽

Pu Zhang ◽

...

Keyword(s):

Static Characteristics ◽

Cfd Model ◽

Tilting Pad ◽

Tilting Pad Bearings

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Rotordynamic characterization of tilting-pad bearings with eight pads in vertical rotors

Journal of Energy Resources Technology ◽

10.1115/1.4051803 ◽

2021 ◽

pp. 1-20

Author(s):

David J Rondon ◽

Gudeta Berhanu Benti ◽

Jan-Olov Aidanpää ◽

Rolf Gustavsson

Keyword(s):

Stokes Equations ◽

Forced Response ◽

Navier Stokes ◽

Navier Stokes Equations ◽

Mean Values ◽

Stationary Coordinate System ◽

Tilting Pad ◽

Tilting Pad Bearings ◽

Stiffness And Damping

Abstract It has been documented that stiffness and damping for a four-pad bearing are dependent not only the magnitude of the load but also on the position of the rotor in the bearing. However, 8-pad bearings are not commonly employed on horizontal turbines, and the presence of several pads in the bearing will decisively affect the dynamics of the system. This paper evaluates the stiffness and damping coefficients of tilting-pad bearings with eight pads and explore the main frequencies acting on the forced response of a vertical rotor. The bearing properties were modeled as a function of eccentricity and position in the stationary coordinate system by Navier-Stokes equations whose results are taken from commercial software. The simulated unbalanced response is compared to experimental results; the changing position of the shaft produces a periodic stiffness and damping, which is dependent on the number of pads. Cross-coupled coefficients influence is discussed, showing that their absence makes an accurate model for the mean values. The results indicate that simulation of vertical rotors with 8-pad bearings can be simplified which allow more effective simulations and dynamic analysis.

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