TECHNICAL PAPERS: Gas Turbines: Structures and Dynamics

Flutter Mechanisms in Low Pressure Turbine Blades

[+] Author and Article Information
M. Nowinski

Swiss Federal Institute of Technology, EPFL-DGM-LTT, Ecublens 1015, Lausanne, Switzerland

J. Panovsky

Honeywell Aerospace, P.O. Box 52181, Phoenix, AZ 85072-2181

J. Eng. Gas Turbines Power 122(1), 82-88 (Oct 20, 1999) (7 pages) doi:10.1115/1.483179 History: Received December 12, 1997; Revised October 20, 1999
Copyright © 2000 by ASME
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Blade Profile with torsion axes and transducer locations
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Magnitude and phase of unsteady pressure: (a) IBPA=−90 deg and (b) IBPA=+90 deg
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Measured Cp magnitude: (a) PS and (b) SS
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Instantaneous pressures from outer wall measurements for IBPA=180 deg
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Experimental damping coefficient distribution: (a) PS and (b) SS
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Overall damping coefficient
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Comparison of influence coefficients for s=0.25 on the SS; (a) magnitude and (b) phase
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Effect of mistuning on overall damping coefficient
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Trends of minimum damping versus key parameters: (a) reduced frequency and (b) incidence
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Trends of minimum damping versus key parameters: (a) static pressure ratio and (b) Zweifel number




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