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RESEARCH PAPERS

Investigations on Large Turbine Bearings Working Under Transitional Conditions Between Laminar and Turbulent Flow

[+] Author and Article Information
G. Hopf, D. Schüler

Institut für Konstruktionstechnik, Ruhr-Universität Bochum, Bochum, Federal Republic of Germany

J. Tribol 111(4), 628-634 (Oct 01, 1989) (7 pages) doi:10.1115/1.3261987 History: Received May 20, 1988; Online October 29, 2009

Abstract

The report deals with investigations on large turbine bearings, a tilting pad bearing, and an elliptical bearing. In special cases, the maximum babbitt temperatures show a sudden leap, caused by a slight change of the operating conditions. According to the test results, the temperatures do not change within the whole bearing, but only in a region near the minimum gap width. As proved by comparative theoretical investigations, the reason for this temperature leap is a local transition between laminar and turbulent flow, changing the thermal conductivity within the oil film to a high degree. Thus, the consideration of thermal diffusion in the energy equation is essential for precalculating this phenomenon. As a consequence of locally high surface temperatures, considerably large thermoelastic deformations are observed at both test bearings. For this reason the comparative calculations are based upon measured gap width profiles.

Copyright © 1989 by ASME
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