Research Papers: Gas Turbines: Structures and Dynamics

Experimental Investigation on the Forced Response of a Dummy Counter-Rotating Turbine Stage With Friction Damping

[+] Author and Article Information
Teresa Berruti

e-mail: teresa.berruti@polito.it

e-mail: vanni.maschio@gmail.com
Department of Mechanical and Aerospace Engineering,
Politecnico di Torino,
Corso Duca degli Abruzzi,
24 10129 Turin, Italy

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF Engineering for Gas Turbines and Power. Manuscript received June 19, 2012; final manuscript received July 3, 2012; published online October 11, 2012. Editor: Dilip R. Ballal.

J. Eng. Gas Turbines Power 134(12), 122502 (Oct 11, 2012) (8 pages) doi:10.1115/1.4007325 History: Received June 19, 2012; Revised July 03, 2012

The paper shows the results of the experimental activity about the dynamics of a stage of a counter-rotating turbine of an open rotor architecture engine. The tests presented here explore the dynamic behavior of a simplified counter-rotating turbine stage. The test results show the dynamic behavior of a counter-rotating turbine stage and highlight the importance of the presence of dry friction for vibration damping.

Copyright © 2012 by ASME
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Fig. 1

(a) The real CRT turbine stage. (b) The test article.

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Fig. 2

Detail of the attachment constraints: (a) free configuration, (b) tightened configuration, and (c) cross section of the test article

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Fig. 3

Natural frequencies versus nodal diameters for the system outer ring sectors and base disk

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Fig. 4

Campbell diagram, 1 F natural frequencies

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Fig. 6

Ring with the magnets facing the test article

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Fig. 7

(a) 1 F, ND3 strain pattern and (b) strain gauge position

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Fig. 8

(a) Detail of the strain gauges and cables. (b) Detail of the antenna of the telemetry system.

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Fig. 9

Deformed shapes of the disk and response FFT: (a) free hooks and (b) constrained hooks

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Fig. 10

Experimental Campbell diagram. Constrained hooks configuration. One exciting magnet.

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Fig. 11

Experimental Campbell diagrams, 21 magnets. (a) 3D free sector hooks. (b) 3D constrained sector hooks.

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Fig. 12

EO = 21, ND = 3. Free hooks, FRF at different magnet gap values.

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Fig. 13

EO = 21, ND = 3. Constrained hooks, FRF at different magnet gap values.

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Fig. 14

EO = 21, ND = 3. Average FRF for the different magnet gap values, comparison of the FRF in the case of free and constrained configuration.

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Fig. 15

ND3. Average maximum strain amplitude for different excitation force in the case of free and constrained hooks configuration.

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Fig. 16

Average maximum strain amplitude for different excitation force in the case of free and constrained hooks configuration, for different ND

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Fig. 17

Normalized maximum FRF amplitude versus the amplitude of the excitation force



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