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Research Article | Open Access

Effect of presence of lifting pocket on the THD performance of a large tilting-pad thrust bearing

Michel FILLON1( ), Michał WODTKE2, Michał WASILCZUK3
 Institut Pprime, CNRS–Université de Poitiers–ISAE-ENSMA, Département Génie Mécanique et Systèmes Complexes, BP 30169, SP2MI, 86962 Futuroscope Chasseneuil Cedex, France
 Faculty of Mechanical Engineering, Gdansk University of Technology, Gdansk, Poland
 Faculty of Mechanical Engineering, Gdansk University of Technology, Gdansk, Poland
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Abstract

Hydrostatic assistance is a commonly used method to improve limited load carrying ability of tilting-pad thrust bearings during transient states of operation of vertical shaft hydro-generators. Despite of special hydraulic equipment (as pumps, valves, etc.), it also requires manufacturing of special recesses/pockets at pad sliding surfaces, into which oil is injected under high pressure. It allows to lift the rotor before start-up of the machine and form a hydrostatic film between pads and collar. There is a quite wide variety of geometry of recesses (shape, depth, and size) met in practical large bearing applications. The presence of a hydrostatic pocket (usually located in the sliding surface above the pivot area, where thin film, high oil pressure and temperature are observed) affects bearing performance under hydrodynamic operation.

In theoretical researches, there is an almost common practice not to include hydrostatic recess in thermohydrodynamic (THD) or thermoelastohydrodynamic (TEHD) analysis. This is probably due to the problems with obtaining solution for oil film geometry with pocket, the order of magnitude of the pocket depths being larger than gap thickness. In this paper, an attempt was taken to study the effect of lifting pocket on THD performance of a large tilting-pad thrust bearing of Itaipu power plant. Bearing performance was evaluated including recess shape for several cases of its depth. The results show that hydrostatic recess changes calculated bearing properties quite significantly, especially in vicinity of the pocket.

Keywords

lifting pockettilting-pad thrust bearingTHD regimenumerical simulations

References

[1]
Ettles C M. Size effects in tilting pad thrust bearings. Wear 59(1): 231-245 (1980).
Crossref Google Scholar
[2]
Ettles C M, Anderson H G. Three-dimensional thermoelastic solutions of thrust bearings using code Marmac 1. ASME J Tribol 113(2): 405-412 (1991).
Crossref Google Scholar
[3]
Kawaike K, Okano K, Furukawa Y. Performance of a large thrust bearing with minimized thermal distortion. ASLE Trans 22(2): 125-134 (1979).
Crossref Google Scholar
[4]
Kuhn E C. Largest thrust bearings are water cooled. Power: 100-101 (1971).
Google Scholar
[5]
Chambers W, Mikula A. Operational data for a large vertical thrust bearing in a pumped storage application. STLE Trans 31(1): 61-65 (1988).
Crossref Google Scholar
[6]
Ettles C M. Some factors affecting the design of spring supported thrust bearings in hydroelectric generators. ASME J Tribol 113(3): 626-632 (1991).
Crossref Google Scholar
[7]
Yuan J H, Medley J B, Ferguson J H. Spring-supported thrust bearings used in hydroelectric generators: Comparison of experimental data with numerical predictions. Tribol Trans 44(1): 27-34 (2001).
Crossref Google Scholar
[8]
Wodtke M. Evaluation of design parameters of a hydrostatic jacking system of a hydrogenerator. (in Polish). Tribologia 196(4): 339-347 (2004).
Google Scholar
[9]
Dąbrowski L, Wasilczuk M. Influence of hydrostatic pump operation period on performance of a thrust bearing of a 125 MW pump-turbine. Mécanique & Industries 5(1): 3-9 (2004).
Crossref Google Scholar
[10]
Pajaczkowski P, Schubert A, Wasilczuk M. Modeling Transient states of large hydrodynamic thrust bearings. In 7th EDF/LMS Poitiers Workshop on Operational limits of bearings: Improving of performance through modeling and experimentation, Poitiers, France, 2008: 1-8.
[11]
Ettles CM, Seyler J, Bottenschein M. Some Effects of start-up and shut-down on thrust bearing assemblies in hydro-generators. J Tribol 125(4): 824-832 (2003).
Crossref Google Scholar
[12]
Generation Equipment Itaipu Hydroelectric Project – Alstom. www.alstom.com, 2015.
[13]
Peeken H, Benner J. Calculations of radial and thrust hydrostatic bearings. (in German). Publication of Th. Goldschmidt AG 61: 2/84, 1984.
Google Scholar
[14]
Abramovitz S. Using hydrostatic bearings as “lifts” in hydroturbines. Hydro Review 19: 38-47 (2000).
Google Scholar
[15]
Wasilczuk M, Wodtke M, Dąbrowski L. Large hydrodynamic thrust bearings and their application in hydrogenerators. In Encyclopedia of Tribology. Wang Q J, Chung Y W (Eds.). Springer, 2013: 1912-1926.
Crossref
[16]
Pajączkowski P, Schubert A, Wasilczuk M, Wodtke M. Simulation of large thrust-bearing performance at transient states, warm and cold start-up. J Eng Tribol 228(1): 96-103 (2014).
Crossref Google Scholar
[17]
Heinrichson N. On the design of tilting-pad thrust bearings Ph.D. Thesis. Lyngby: Technical University of Denmark, 2006.
Crossref
[18]
Wodtke M, Schubert A, Fillon M, Wasilczuk M, Pajączkowski P. Large hydrodynamic thrust bearing: Comparison of the calculations and measurements. J Eng Tribol 228(9): 974-983 (2014).
Crossref Google Scholar
[19]
Wodtke M, Fillon M, Schubert A, Wasilczuk M. Study of the influence of heat convection coefficient on predicted performance of a large tilting-pad thrust bearing. J Tribol 135(2): 1-11 (2013).
Crossref Google Scholar
[20]
Ansys, Release 13 documentation, SAS IP, Inc, 2010.
Friction
Volume 3 Issue 4,
December 2015
Pages 266-274
DOI: 10.1007/s40544-015-0092-4
Cite this article:
FILLON M, WODTKE M, WASILCZUK M. Effect of presence of lifting pocket on the THD performance of a large tilting-pad thrust bearing. Friction, 2015, 3(4): 266-274. https://doi.org/10.1007/s40544-015-0092-4

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Received: 23 April 2015
Revised: 25 July 2015
Accepted: 05 October 2015
Published: 17 November 2015
© The author(s) 2015

This article is published with open access at Springerlink.com

Open Access: This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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