Research Papers: Gas Turbines: Structures and Dynamics

Direct Outer Ring Cooling of a High Speed Jet Engine Mainshaft Ball Bearing: Experimental Investigation Results

[+] Author and Article Information
Peter Gloeckner

 FAG Aerospace GmbH & Co. KG, Georg Schaefer Str. 30, 97421 Schweinfurt, Germanypeter.gloeckner@schaeffler.com

Klaus Dullenkopf

Institut für Thermische Strömungsmaschinen, Karlsruhe Institute of Technology KIT, Kaiser Str. 12, 76131 Karlsruhe, Germanyklaus.dullenkopf@kit.edu

Michael Flouros

 MTU Aero Engines GmbH, Dachauer Str. 665, 80995 Munich, Germanymichael.flouros@mtu.de

J. Eng. Gas Turbines Power 133(6), 062503 (Feb 17, 2011) (7 pages) doi:10.1115/1.4002355 History: Received July 01, 2010; Revised July 02, 2010; Published February 17, 2011; Online February 17, 2011

Operating conditions in high speed mainshaft ball bearings applied in new aircraft propulsion systems require enhanced bearing designs and materials. Rotational speeds, loads, demands on higher thrust capability, and reliability have increased continuously over the last years. A consequence of these increasing operating conditions are increased bearing temperatures. A state of the art jet engine high speed ball bearing has been modified with an oil channel in the outer diameter of the bearing. This oil channel provides direct cooling of the outer ring. Rig testing under typical flight conditions has been performed to investigate the cooling efficiency of the outer ring oil channel. In this paper, the experimental results including bearing temperature distribution, power dissipation, and bearing oil pumping and the impact on oil mass and parasitic power loss reduction are presented.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Sketch of the high speed ball bearing with the outer ring cooling channel

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Figure 2

Rig tested high speed ball bearing and bearing chamber with measured variables

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Figure 3

Rig tested high speed ball bearing with bulk temperature instrumentation

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Figure 4

Scoop efficiency for different nominal oil flows

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Figure 5

Oil flow to the bearing left and right sides

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Figure 6

Oil temperature on left and right sides of the bearing

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Figure 7

Bulk temperature depending on bypass oil flow (Vnom=12 l/min)

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Figure 8

Bulk temperature depending on bypass oil flow (Vnom=6 l/min)

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Figure 9

Bulk temperature as function of bypass oil flow for oil inlet temperatures of 80°C and 110°C

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Figure 10

Cooling effect on outer ring bulk temperature for a thrust range of 40–80 kN and different bypass oil flows

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Figure 11

Bypass oil scavenge temperature

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Figure 12

Outer ring channel heat to oil (transferred heat from the bearing to the outer ring channel oil)

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Figure 13

Outer ring channel pumping power

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Figure 14

Total bearing power loss (torque meter results)

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Figure 15

Influence of bypass oil flow direction




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