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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Some Experiments on Oil Whirl and Oil Whip

[+] Author and Article Information
A. El-Shafei, S. H. Tawfick, M. S. Raafat, G. M. Aziz

Faculty of Engineering, Department of Mechanical Design and Production, Cairo University, Giza 12316, Egypt

J. Eng. Gas Turbines Power 129(1), 144-153 (Mar 01, 2004) (10 pages) doi:10.1115/1.2181185 History: Received October 01, 2003; Revised March 01, 2004

The oil whirl and oil whip phenomena have been well known since the early twentieth century. However, there is a lot of confusion on the parameters that affect the onset of instability. In this study, we investigate the onset of instability on a flexible rotor mounted on two plain cylindrical journal bearings. The rotor is run through the first critical speed, the instability, and the second critical speed. Tests are conducted at various unbalance levels, pressures, and misalignment conditions on the coupling. It is shown that, by far, the misalignment of the coupling is the parameter that is most effective on the onset of instability. In particular angular misalignment resulted in the smoothest rotor response.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 2

Schematic of test rig

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Figure 3

(a) Default rotor data. (b) Rotor Campbell diagram.

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Figure 4

Plain journal bearing

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Figure 5

Fluid supply circuit

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Figure 6

Measurement system

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Figure 7

Tracking data, case 1

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Figure 8

Orbital data, case 1 (speeds in rpm)

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Figure 9

Spectral data (speed 5800rpm), case 1

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Figure 10

Tracking data, nondrive side bearing

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Figure 11

Tracking data, case 2

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Figure 12

Orbital data, case 2 (speeds in rpm)

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Figure 13

Tracking data, case 3

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Figure 14

Orbital data, case 3 (speeds in rpm)

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Figure 15

Tracking data, case 4

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Figure 16

Orbital data, case 4 (speeds in rpm)

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Figure 17

Tracking data, case 5

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Figure 18

Orbital data, case 5

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Figure 19

Tracking data, case 6

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Figure 20

Orbital data, case 6 (speeds in rpm)

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Figure 21

Tracking data, nondrive side bearing, case 6

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Figure 22

Tracking data, case 7

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Figure 23

Orbital data, case 7 (speeds in rpm)

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Figure 24

Waterfall plot, case 5

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Figure 25

Waterfall plot, case 6

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Figure 26

Offset and angular misalignment

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