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TECHNICAL PAPERS: Gas Turbines: Heat Transfer

Influence of Operating Condition and Geometry on the Oil Film Thickness in Aeroengine Bearing Chambers

[+] Author and Article Information
P. Gorse

Institut für Thermische Strömungsmaschinen, University of Karlsruhe, 76128 Karlsruhe, Germany

S. Busam

 MTU Aero-Engines GmbH, Dachauer Strasse 665, 80995 München, Germany

K. Dullenkopf

Institut für Thermische Strömungsmaschinen,  University of Karlsruhe, 76128 Karlsruhe, Germany

J. Eng. Gas Turbines Power 128(1), 103-110 (Mar 01, 2004) (8 pages) doi:10.1115/1.1924485 History: Received October 01, 2003; Revised March 01, 2004

Increasing the efficiency of modern jet engines does not only imply to the mainstream but also to the secondary air and oil system. Within the oil system the bearing chamber is one of the most challenging components. Oil films on the chamber walls are generated from oil droplets, ligaments, or film fragments, which emerge from bearings, seal plates and shafts, and enter the bearing chamber with an angular momentum. Furthermore, shear forces at its surface, gravity forces, and the design of scavenge and vent ports strongly impact the behavior of the liquid film. The present paper focuses on the experimental determination of the film thickness in various geometries of bearing chambers for a wide range of engine relevant conditions. Therefore, each configuration was equipped with five capacitive probes positioned at different circumferential locations. Two analytical approaches are used for a comprehensive discussion of the complex film flow.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

High speed bearing chamber test rig

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Figure 2

Different configurations of bearing chambers and angular positions of film thickness and velocity measurements

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Figure 3

Determination of film thickness using capacitive sensors

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Figure 4

Adaptation of angular momentum balance to the present configurations

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Figure 5

Comparison of 1D gas model and experimentally determined velocity profile

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Figure 6

Calculation scheme for the film thickness distribution in bearing chambers

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Figure 7

Visualization of liquid wall film in configuration BCI

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Figure 8

Velocity profiles of liquid wall film at φ=330deg and V̇ℓ,in=100l∕h

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Figure 9

Characterization of liquid wall film at φ=330deg and V̇i,in=100l∕h

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Figure 10

Theoretical analysis of film flow depending on the angular position

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Figure 11

Experimentally determined film thicknesses: Effect of rotational speed in configuration BCI

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Figure 12

Experimentally determined film thicknesses: Effect of rotational speed in configuration BCII

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Figure 13

Experimentally determined film thicknesses: Effect of rotational speed in configuration BCIII

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Figure 14

Experimentally determined film thicknesses: Effect of lubrication oil in the different configurations

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