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TECHNICAL PAPERS

Experimental Study of 3D Unsteady Flow Around Oscillating Blade With Part-Span Separation

[+] Author and Article Information
O. J. R. Queune, L. He

School of Engineering, University of Durham, Durham, DH1 3LE, United Kingdom

J. Turbomach 123(3), 519-525 (Feb 01, 2000) (7 pages) doi:10.1115/1.1370164 History: Received February 01, 2000
Copyright © 2001 by ASME
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References

Schmidt, D., and Riess, W., 1999, “Steady and Unsteady Flow Measurements in the Last Stages of LP Steam Turbines,” presented at the 3rd European Turbomachinery Conference, London, IMechE C557/023/99.
Barton, H. A., and Halliwell, D. G., 1997, “Detailed On-Blade Measurements on a Transonic Fan in Unstalled Supersonic Flutter,” Proceedings of the 4th International Symposium on Unsteady Aerodynamics and Aeroelasticity of Turbomachines (ISUAAT), Aachen, Germany.
Carta,  F. O., and St. Hilaire,  A. O., 1978, “Experimentally Determined Stability Parameters of a Subsonic Cascade Oscillating Near Stall,” ASME J. Eng. Power, 100, pp. 111–120.
Carta,  F. O., and St. Hilaire,  A. O., 1980, “Effects of Interblade Phase Angle on Cascade Pitching Stability,” ASME J. Eng. Power, 102, pp. 391–396.
Bölcs, A., and Fransson, T. H., 1986, “Aeroelasticity in Turbomachines: Comparison of Theoretical and Experimental Cascade Results,” Communication du Laboratoire de Thermique Apliquée et de Turbomachines, No. 13, Lausanne, EPFL.
He,  L., 1998, “Unsteady Flows in Oscillating Turbine Cascade, Part 1. Linear Cascade Experiment,” ASME J. Turbomach., 120, pp. 262–268.
Bell, D. L., and He, L., 1997, “Three Dimensional Unsteady Pressure Measurements for an Oscillating Turbine Blade,” ASME Paper No. 97-GT-105.
Bell, D. L., and He, L., 1997, “Three Dimensional Unsteady Flow Around a Turbine Blade Oscillating in Bending Mode—An Experimental and Computational Study,” presented at the 8th ISUAAT, Stockholm, Sweden.
Bell, D. L., and He, L., 1998, “Three Dimensional Unsteady Flow for an Oscillating Turbine Blade and the Influence of Tip Leakage,” ASME Paper No. 98-GT-571.

Figures

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Schematic representation of separated flow inside the last stage of a steam turbine at low flow conditions
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The test facility working section with step upstream of the blade
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Working section in side view with the step used to create flow separation
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(a) Steady flow blade pressure measurements with and without step at 10 and 50 percent span. (b) Steady flow blade pressure measurements with and without step at 70 and 90 percent span.
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Phase angle of first harmonic pressure with NO STEP (Bc: 0.055 C at k: 0.25)
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Amplitude of first harmonic pressure with NO STEP (Bc: 0.055 C at k: 0.25)
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Phase angle of first harmonic pressure WITH STEP (Bc: 0.055 C at k: 0.25)
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Amplitude of first harmonic pressure WITH STEP (Bc: 0.055 C at k: 0.25)
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Aerodynamic damping with step (Bc: 0.055 C at k: 0.25)
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Spanwise distribution in the 2D damping coefficient for two different bending amplitudes (k: 0.5)
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Amplitude of the first harmonic pressure response
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Phase of the first harmonic pressure response
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Relative amplitude of the second harmonic pressure response

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