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Research Papers: Gas Turbines: Structures and Dynamics

The Effect of Initial Injection Conditions on the Oil Droplet Motion in a Simplified Bearing Chamber

[+] Author and Article Information
M. Farrall

University Technology Centre in Transmission Systems, School of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdom

S. Hibberd1

University Technology Centre in Transmission Systems, School of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdomstephen.hibberd@nottingham.ac.uk

K. Simmons

University Technology Centre in Transmission Systems, School of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, United Kingdomeazksim@gwmail.nottingham.ac.uk

1

Corresponding author.

J. Eng. Gas Turbines Power 130(1), 012501 (Dec 13, 2007) (7 pages) doi:10.1115/1.2770480 History: Received December 13, 2004; Revised October 09, 2005; Published December 13, 2007

Increasing demands on aeroengines to operate at higher shaft speeds and temperatures require an understanding and optimization of the integral systems. The ability to model movement of oil around bearing chambers in the form of droplets and films is a current area of interest. This paper presents a two-phase numerical modeling approach developed for predicting air, oil droplet, and oil film behavior within an aeroengine bearing chamber including the significant droplet/film interactions. In-house code is linked to the commercial CFD package CFX4.3 and a predictive algorithm for determining the outcome of droplet impact with a wall film and the associated transfer of oil mass and momentum is developed. The method is used to simulate the motion of oil droplets shed from a roller bearing in a simplified aeroengine bearing chamber geometry and through a parametric study shows that initial droplet size distribution parameters (mean diameter and spread) have a significant effect on oil deposition location. In contrast, the Sauter mean diameter of droplets within the chamber showed little sensitivity to initial injection parameters. The behavior of oil within a bearing chamber is strongly influenced by the conditions with which it leaves the bearing. There is potential for performance improvement if bearing shed can be controlled or if chamber design can be modified such that oil behavior is insensitive to initial shed conditions.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Physical phenomena occurring in a bearing chamber

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Figure 2

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

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Figure 3

Schematic of representative 2D chamber geometry

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Figure 4

Trajectories of oil droplets shed from the inner shaft

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Figure 5

Plots showing the variation with angular location of (a) the cdf for the oil deposited on the chamber housing (cdf) and (b) the SMD

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Figure 6

Profiles of the cdf with angular location for different values of d

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Figure 7

The change of SMD with angular location for different values of d

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Figure 8

Profiles of the cdf with angular location for different values of δ

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Figure 9

Profiles of the cdf with angular location for different values of ur

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