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TECHNICAL PAPERS: Gas Turbines: Heat Transfer

A Numerical Model for Oil Film Flow in an Aeroengine Bearing Chamber and Comparison to Experimental Data

[+] Author and Article Information
Mark Farrall, Kathy Simmons, Stephen Hibberd

University Technology Centre for Gas Turbine Transmission Systems,  University of Nottingham, University Park, Nottingham, NG7 2RD, UK

Philippe Gorse

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

J. Eng. Gas Turbines Power 128(1), 111-117 (Mar 01, 2004) (7 pages) doi:10.1115/1.1924719 History: Received October 01, 2003; Revised March 01, 2004

The work presented forms part of an ongoing investigation, focusing on modeling the motion of a wall oil film present in a bearing chamber and comparison to existing experimental data. The film is generated through the impingement of oil droplets shed from a roller bearing. Momentum resulting from the impact of oil droplets, interfacial shear from the airflow, and gravity cause the film to migrate around the chamber. Oil and air exit the chamber at scavenge and vent ports. A previously reported numerical approach to the simulation of steady-state two-phase flow in a bearing chamber, which includes in-house submodels for droplet-film interaction and oil film motion, has been extended. This paper includes the addition of boundary conditions for the vent and scavenge together with a comparison to experimental results obtained from ITS, University of Karlsruhe. The solution is found to be sensitive to the choice of boundary conditions applied to the vent and scavenge.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of physical phenomena in chamber

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Figure 2

High-speed bearing-chamber test rig

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Figure 3

Schematic showing the structure of droplet-film interaction model and the transition criteria for the various outcomes

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Figure 4

Schematic diagram of chamber cross section through (a) an axial plane and (b) an angular plane through the vent port, indicating the model boundary conditions

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Figure 5

Computational domain indicating the mesh density in the vicinity of the vent and scavenge ports

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Figure 6

Oil droplet tracks in the vicinity of the vent port. Indicated on the plot is the roller bearing and the inlet for the sealing airflow.

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Figure 7

Film thickness distribution on chamber housing. Arrows represent the principle directions for the interfacial shear.

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Figure 8

Profiles showing the variation around the chamber housing of (a) the film thickness and (b) the average film velocity, at an axial location of 7.5mm

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Figure 9

Profiles showing the variation around the chamber housing of (a) the film thickness and (b) the average film velocity, at an axial location of 7.5mm

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