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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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References

Bölcs, A., and Schläfli, D., 1984, “Flutter Phenomena in a Transonic Turbine Cascade,” Unsteady Aerodynamics of Turbomachines and Propellers, Proceedings, Symposium, Cambridge, England, pp. 411–425, September 24–27, 1984.
Buffum, D. H., and Fleeter, S., 1990, “Aerodynamics of a Linear Oscillating Cascade,” NASA Technical Memorandum 103250.
Panovsky, J., Nowinski, M., and Bölcs, A., 1997, “Flutter of Aircraft Engine Low Pressure Turbine Blades,” presented at the 8th International Symposium of Unsteady Aerodynamics and Aeroelasticity of Turbomachines, Stockholm, Sweden, Sept. 14–18, 1997.
Bölcs, A., 1983, “A Test Facility for the Investigation of Steady and Unsteady Transonic Flows in Annular Cascades,” ASME Paper 83-GT-34.
Kirschner, A., Fosco, B., and Muller, E., 1980, “Control of Vibration in Aeroelastic Experiments,” Communication de l’ITA/EPFL, No. 10, pp. 285–295.
Holmes, D. G., and Chuang, H. A., 1993, “2D Linearized Harmonic Euler Flow Analysis for Flutter and Forced Response,” in Unsteady Aerodynamics, Aeroacoustics, and Aeroelasticity of Turbomachines and Propellers, H. M. Atassi, ed., Springer-Verlag, New York.
Bölcs, A., and Fransson, T. H., 1986, “Aeroelasticity in Turbomachines: Comparison of Theoretical and Experimental Cascade Results,” Air Force Office of Scientific Research, AFOSR-TR-87-0605.
Panovsky, J., 1997, “Flutter of Aircraft Engine Turbine Blades,” Ph.D. dissertation, University of Cincinnati, Cincinnati, OH.
Lane, F., 1956, “System Mode Shapes in the Flutter of Compressor Blade Rows,” J. Aeronaut. Sci., pp. 54–66.
Crawley, E. F., 1998, “Aeroelastic Formulation for Tuned and Mistuned Rotors,” chapter 19 in AGARD Manual on Aeroelasticity in Axial-Flow Turbomachines, Vol. 2, Structural Dynamics and Aeroelasticity, M. F. Platzer and F. O. Carta, eds., AGARD-AG-298.
Crawley,  E. F., and Hall,  K. C., 1985, “Optimization and Mechanisms of Mistuning in Cascades,” ASME J. Eng. Gas Turbines Power, 107, No. 2, pp. 418–426.
Körbächer, H., 1996, “Experimental Investigation of the Unsteady Flow in an Oscillating Annular Compressor Cascade,” Ph.D. dissertation, Laboratoire de Thermique appliquée et de Turbomachines, Swiss Federal Institute of Technology, Lausanne, Switzerland.
Bölcs, A., Fransson, T. H., and Schläfli, D., 1989, “Aerodynamic Superposition Principle in Vibrating Turbine Cascades,” presented at the AGARD 74th Specialists’ Meeting of the Propulsion and Energetics Panel on Unsteady Aerodynamic Phenomena in Turbomachines, Luxembourg, August 28–September 1, 1989.
Körbächer, H., and Bölcs, A., 1996, “Steady-State and Time-Dependent Experimental Results of a NACA-3506 Cascade in an Annular Channel,” ASME Paper 96-GT-334.
Kaza,  K. R. V., and Kielb,  R. E., 1982, “Flutter and Response of a Mistuned Cascade in Incompressible Flow,” AIAA J., 20, No. 8, pp. 1120–1127.
Zweifel,  O., 1945, “The Spacing of Turbomachinery Blading. Especially with Large Angular Deflection,” Brown Boveri Rev., Vol. 32, p. 12.
Panovsky, J., and Kielb, R., 1998, “A Design Method to Prevent Low Pressure Turbine Blade Flutter,” presented at the ASME Gas Turbine Conference and Exhibition, Stockholm, Sweden, June, 1998.

Figures

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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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Magnitude and phase of unsteady pressure: (a) IBPA=−90 deg and (b) IBPA=+90 deg
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Blade Profile with torsion axes and transducer locations
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Trends of minimum damping versus key parameters: (a) static pressure ratio and (b) Zweifel number
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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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