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.
Investigations on Large Turbine Bearings Working Under Transitional Conditions Between Laminar and Turbulent Flow
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Hopf, G., and Schu¨ler, D. (October 1, 1989). "Investigations on Large Turbine Bearings Working Under Transitional Conditions Between Laminar and Turbulent Flow." ASME. J. Tribol. October 1989; 111(4): 628–634. https://doi.org/10.1115/1.3261987
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