Research Papers

Experimental Analysis of Dynamic Interaction Between a Centrifugal Compressor and Its Casing

[+] Author and Article Information
P. Almeida

École Centrale de Lyon,
Laboratoire de Tribologie et Dynamique
des Systèmes,
36, avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: patricio.almeida@ec-lyon.fr

C. Gibert, F. Thouverez, X. Leblanc

École Centrale de Lyon,
Laboratoire de Tribologie et Dynamique
des Systèmes,
36, avenue Guy de Collongue,
Ecully Cedex 69134, France

J.-P. Ousty

Turbomeca–Safran Group,
Bordes Cedex 64511, France

Subscript S is used for the stationary frame while R refers to the rotating frame.

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received July 24, 2014; final manuscript received August 2, 2014; published online October 7, 2014. Editor: Ronald Bunker.

J. Turbomach 137(3), 031008 (Oct 07, 2014) (10 pages) Paper No: TURBO-14-1174; doi: 10.1115/1.4028328 History: Received July 24, 2014; Revised August 02, 2014

In turbomachinery, one way to improve aerodynamic performance and reduce fuel consumption consists of minimizing the clearance between rotor and casing. Yet, the probability of contact is increased and this may lead in some specific conditions to a large and even unstable excitation on the impeller and stator. To achieve better understanding of the dynamic behavior occurring during the blade-to-casing contact, many numerical studies have been conducted but only a few experiments have been reported in the literature thus far. The interaction experiment reported in this paper involves a low-pressure, rotating centrifugal compressor and its casing tested in a vacuum chamber. Contact is initiated by introducing a gap near zero, and certain events with significant dynamic levels are observed during the run-up. Measurements are performed using strain gauges on both the rotating and stationary parts and a scanning laser Doppler vibrometer on the stator. This research focuses on an analysis of the recorded data. Time series data are also analyzed by means of standard signal processing and a full spectrum analysis in order to identify the direction of traveling wave propagation on the two structures as well as nodal diameters and frequencies. The dynamic response of structures is accompanied by variations in other physical parameters such as temperature, static deformed shapes, speed, and torque. A wearing pattern is evaluated following the contact experiments. The spectral content of response is dominated by frequency modes excited by rotating speed harmonics as well as by sidebands due to inherent system nonlinearity.

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Fig. 1

Test rig general view

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Fig. 2

Instrumentation installed on both structures

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Fig. 3

LVDT sensor fixed on the centrifugal compressor

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Fig. 4

Typical impeller FRF: measured FRF (– – –), synthesized FRF (——), modal participation of each mode (thin curves)

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Fig. 5

Typical casing FRF: measured FRF (– – –), synthesized FRF (——)

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Fig. 6

Family modes of the impeller

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Fig. 7

Family modes of the casing

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Fig. 8

Example of an operational deflection shape closed to a resonance with 5ND

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Fig. 9

Campbell diagram in stationary frame

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Fig. 10

Dynamic response of the impeller (top) and the casing (bottom)

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Fig. 11

Speed and torque time history

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Fig. 12

Temperature history on the stator

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Fig. 13

Quasi-static response of the casing

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Fig. 14

STFT with rotating speed harmonics (a) casing and (b) impeller

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Fig. 15

STFT of the impeller: initiation of bursts (a) initiation of the first burst and (b) initiation of other bursts

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Fig. 16

Family contributions at seventh burst

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Fig. 17

STFT spectrum of the first family modes of both structures (a) casing and (b) impeller

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Fig. 18

STFT spectrum zoomed on the eighth burst (a) casing and (b) impeller

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Fig. 19

2D DFT diagram: eighth burst

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Fig. 20

Wear pattern of the casing

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Fig. 21

Spatial spectrum analysis of the wear pattern of the abradable coating




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