Operating Conditions of Multi-Lobe Journal Bearings Under High Thermal Loads

[+] Author and Article Information
N. Mittwollen, J. Glienicke

Institut für Maschinenelemente und Fördertechnik, Technische Universität Braunschweig, D-3300 Braunschweig, Federal Republic of Germany

J. Tribol 112(2), 330-338 (Apr 01, 1990) (9 pages) doi:10.1115/1.2920261 History: Received February 22, 1989; Online June 05, 2008


The governing equations for the performance prediction of oil film journal bearings in high speed turbomachinery are elaborated. The lubricant temperature and viscosity are admitted to vary in all three dimensions and a possible reverse flow is allowed for. Laminar-turbulent flow transition, thermal groove mixing and film rupture are taken into account with refined models. The computational methods are assembled in a corresponding computer code. A successful verification is accomplished by comparing the theoretical results with recent experimental data. The calculation of the running performance of technically important multi-lobe bearing designs shows the significance of the maximum film temperature as failure criterion in severe operating conditions; flow transition and hot oil carry-over have considerable effects.

Copyright © 1990 by The American Society of Mechanical Engineers
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