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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

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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