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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Vibration Characteristics of a 75kW Turbo Machine With Air Foil Bearings

[+] Author and Article Information
Kyeong-Su Kim

Department of Aerospace Engineering,  Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Korea

In Lee1

Department of Aerospace Engineering,  Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Koreainlee@asdl.kaist.ac.kr

1

Author to whom correspondence should be addressed.

J. Eng. Gas Turbines Power 129(3), 843-849 (Jul 15, 2006) (7 pages) doi:10.1115/1.2718220 History: Received March 10, 2006; Revised July 15, 2006

Air foil bearings are very attractive bearing systems for turbomachinery because they have several advantages over conventional bearings in terms of oil-free environment, low power loss, long life, and no maintenance. However, most of the developed machines using air foil bearings are limited to small and high-speed rotors of 60,000–120,000 rpm, since the increase in power of turbomachinery requires lower rotor speed and greater loading in bearings, which makes it difficult to use air foil bearings for large machines. In this paper, a 75 kW turboblower using air foil bearings is introduced, and the vibration characteristics of the machine have been investigated experimentally under a wide range of operating conditions, including compressor surge in the performance test. The machine is designed to be fully air lubricated and air cooled, and its operating speed is 20,000–26,000 rpm with maximum pressure ratio of 1.8. The results show that the air foil bearings offer adequate damping to ensure dynamically stable operation in the whole range.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Application spectrum of air foil journal bearings

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Figure 2

Turbo blower and its rotor: (a) Layout of the turbo blower and (b) rotor assembly

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Figure 3

Thrust bearing and front journal bearing

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Figure 4

Geometry of air foil bearings: (a) Journal bearing and (b) thrust bearing

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Figure 5

Performance test rig and instrumentation: (a) Test rig and (b) instrumentation

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Figure 6

Rotor speed, discharge pressure, and rotor vibration versus time

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Figure 7

Temperatures and axial displacement of rotor versus time

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Figure 8

Pressure pulsation measured at surge: (a) Time signal and (b) frequency spectrum

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Figure 9

Rotor vibration measured at surge: (a) Rotor orbit and (b) frequency spectrum

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Figure 10

Rotor vibration after being recovered from surge: (a) Rotor orbit and (b) frequency spectrum

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Figure 11

Frequency spectrum of axial movement of rotor at surge

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Figure 12

Vertical waterfall diagram during coast down

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Figure 13

Rotor speed and synchronous rotor vibration during cast down

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Figure 14

Synchronous rotor vibration versus rotor speed during coast down

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Figure 15

Critical speeds versus support stiffness

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Figure 16

Bearing wear pattern after a deep surge in the field

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Figure 17

View of air foil bearings after one year operation in the field: (a) Rear journal bearing and (b) thrust bearing

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