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TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Experimental Study of Aerodynamic and Structural Damping in a Full-Scale Rotating Turbine

[+] Author and Article Information
J. J. Kielb

Rolls-Royce, P.O. Box 420, Speed Code T-10B, Indianapolis, IN 46241

R. S. Abhari

Turbomachinery Lab, Swiss Federal Institute of Technology, Zurich 8126, Switzerland

J. Eng. Gas Turbines Power 125(1), 102-112 (Dec 27, 2002) (11 pages) doi:10.1115/1.1496776 History: Received December 01, 2000; Revised March 01, 2001; Online December 27, 2002
Copyright © 2003 by ASME
Topics: Damping , Blades , Turbines , Disks
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References

Srinivasan,  A. V., 1984, “Vibrations of Bladed-Disk Assemblies—A Selected Survey,” ASME J. Vib., Acoust., Stress, Reliab. Des., 106, pp. 165–168.
Srinivasan,  A. V., and Cutts,  D. G., 1984, “Measurement of Relative Vibratory Motion at the Shroud Interfaces of a Fan,” ASME J. Vib., Acoust., Stress, Reliab. Des., 106, pp. 189–197.
Yang, B. D., and Menq, C. H., 1997, “Characterization of Contact Kinematics and Application to the Design of Wedge Dampers in Turbomachinery Blading,” ASME Paper No. 97-GT-97.
Sanliturk, K. Y., Ewins, D. J., and Stanbridge, A. B., 1999, “Underplatform Dampers for Turbine Blades: Theoretical Modeling, Analysis, and Comparison With Experimental Data,” ASME Paper No. 99-GT-335.
Jeffers, T., Kielb, J., and Abhari, R., 2000, “A Novel Technique For Measurement of Rotating Blade Damping,” ASME Paper No. 2000-GT-0359.
Chiang,  H., and Kielb,  R., 1993, “An Analysis System for Blade Forced Response,” ASME J. Eng. Gas Turbines Power, 115, pp. 762–770.
Abhari, R. S., and Giles, M., 1997, “A Navier-Stokes Analysis of Airfoils in Oscillating Transonic Cascades for the Prediction of Aerodynamic Damping,” ASME Paper No. 95-GT-182.
Kielb, J. J., Abhari, R. S., and Dunn, M. G., 2001, “Experimental and Numerical Study of Forced Response in a Full-Scale Rotating Turbine,” ASME Paper No. 2001-GT-0263.
Dunn, M. G., Moller, J. C., and Steele, R. C., 1989, “Operating Point Verification Data for a Large Shock Tunnel Test Facility,” WDRC-TR-89-2027, May.
Dunn,  M. G., and Hause,  A., 1982, “Measurement of Heat Flux and Pressure in a Turbine Stage,” ASME J. Eng. Gas Turbines Power, 104, pp. 215–223.
Dunn,  M. G., Rae,  W. J., and Holt,  J. L., 1984, “Measurement and Analysis of Heat Flux Data in a Turbine Stage,” ASME J. Eng. Gas Turbines Power, 106, pp. 229–233.

Figures

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Diagram of approach to experimental method
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Experimental Campbell diagram for instrumented airfoils (obtained from vacuum spin tests)
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Finite element analysis mode shapes
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Strain gage locations and blade distribution
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Piezos and strain gages on subsection of rotor
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Response of blade 66 in vacuum at 9300 rpm for two frequency resolutions and two gage locations
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Response of blade 54 in vacuum at 9300 rpm for two frequency resolutions and two gage locations
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Second bending vibratory response in vacuum of blade 54 at six different rotational speeds
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Change in structural damping with rotational speed for 2B and 1T modes
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Comparison of blade 54 vibratory response in the Broach block and the spinning rotor in vacuum
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Comparison of blade 54 damping in the Broach block and the spinning rotor in vacuum
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Large frequency range vibratory response at 19,500 rpm in vacuum and with 2B aerodynamic excitation
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Vibratory response of 2B at 19,500 rpm in vacuum and with air loading
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Vibratory response of 1T in vacuum and with air loading
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Variation in damping and peak response for 2B with (a) change in inlet pressure and (b) change in axial vane to blade spacing

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