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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Modeling Oil Flows on Seal Runners and Engine Sump Walls

[+] Author and Article Information
Masayoshi Shimo

School of Aeronautics and Astronautics,  Purdue University, 1282 Grissom Hall West, Lafayette, IN 47907-1282shimo@ecn.purdue.edu

James V. Canino, Stephen D. Heister

School of Aeronautics and Astronautics,  Purdue University, 1282 Grissom Hall West, Lafayette, IN 47907-1282

J. Eng. Gas Turbines Power 127(4), 827-834 (Dec 13, 2004) (8 pages) doi:10.1115/1.1924431 History: Received September 03, 2003; Revised December 13, 2004

Oil flow behavior within a lubrication system utilized in a turbofan engine has been studied using a two-dimensional model for a seal runner and a sump wall. A two-dimensional, axisymmetric boundary layer method is utilized to derive a model for the film on the seal runner. An integral method analysis of boundary layer equations are utilized to derive a model for the film behavior on the outer wall of the sump neglecting variations in the axial direction. Parametric studies for oil flow at the seal runner and one the sump wall have been generated for a wide range of oil film properties and ambient conditions.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 12

Nondimensionalized oil film thickness at the end of the seal runner versus shaft rotational rate in three different shaft radii [h1=2mm,rb(baselineshaftradius)=60.6mm]

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Figure 13

Nondimensionalized velocity at the end of the seal runner versus shaft rotational rate in three different shaft radii (rlip=r+7.7mm,rb=60.6mm)

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Figure 14

Film thickness propagation along θ direction until 2s

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Figure 15

Film velocity propagation along θ direction until 2s

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Figure 16

Plots of oil film thickness distributions with the sump

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Figure 17

Expanded plots of oil film thickness distributions along the θ-direction

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Figure 18

Histories of each source term at θ=0deg

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Figure 19

Time-averaged oil film thicknesses and circumferential velocities in various initial film thicknesses

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Figure 20

Time-averaged oil film thicknesses and circumferential velocities in various oil temperatures

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Figure 1

The cross-sectional view of a gas turbine center sump top and bottom

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Figure 2

Front and side view of sump wall

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Figure 3

2D axisymmetric boundary layer model elements of the seal runner

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Figure 4

Comparison of the swirl velocity for the Couette flow solution and the current turbulent solution

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Figure 5

Variation of the shear stress along the sump wall

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Figure 6

Effect of the sump wall velocity on the shear stress

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Figure 7

Scaled shear stress as a function of the shifted sump wall velocity

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Figure 8

Velocity of the oil film where the shear stress is zero as a function of the inverse of gap ratio

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Figure 9

Oil film thickness, and axial and circumferential velocity distributions for baseline case

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Figure 10

Nondimensionalized oil film thickness at the end of the seal runner versus shaft rotational rate in three different mass flow rates [h1(initialfilmthickness)=2mm,mdb(baselinemassflow)=0.021kg∕s]

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Figure 11

Nondimensionalized velocity at the end of the seal runner versus shaft rotational rate in three different mass flow rates [rlip(radiusofsealrunneratlip)=68.2mm,mdb=0.021kg∕s]

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