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TECHNICAL PAPERS

Blade Count and Clocking Effects on Three-Bladerow Interaction in a Transonic Turbine

[+] Author and Article Information
H. D. Li, L. He

School of Engineering, University of Durham, South Road, Durham DH1 3LE, UK

J. Turbomach 125(4), 632-640 (Dec 01, 2003) (9 pages) doi:10.1115/1.1622711 History: Received December 01, 2001; Revised March 01, 2002; Online December 01, 2003
Copyright © 2003 by ASME
Topics: Blades , Stators , Rotors , Turbines
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References

Figures

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Computational mesh (original experimental configuration)
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Isentropic Mach number distribution
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Pressure time histories at sensor positions S1 and P6 (S1: suction surface 5% axial chord; P6: pressure surface 67% axial chord)
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Spectrum of normal force on a rotor blade (normalized by the first harmonic component, experimental condition, blade counts 12/20/7)
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Time histories of unsteady normal force on stator blades (experimental condition, blade counts: 12/20/7)
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Spectrum of normal force on stator blade 5 (normalized by the first harmonic component, experimental condition, blade counts: 12/20/7)
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Time histories of normal force on rotor blades (Blade counts: 12/20/11)
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Unsteady normal force magnitudes of the stator row for five different blade counts
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Unsteady normal force magnitudes variation with local clocking position
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Unsteady normal force magnitude on stator blades at different clocking positions of blade 1 (blade counts: 12/20/11)
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Sketch showing NGV wake-rotor wake interference (both phases of chopped NGV and rotor wakes seen by stator are determined by instantaneous rotor phase θrotor)
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Time averaged entropy contours at different clocking positions (stator L.E. relative to NGV L.E.) (equal NGV stator blade count: 12/20/12); (a) clocking at 0.2 NGV pitch, near maximum forcing, (b) clocking at 0.8 NGV pitch, near minimum forcing.

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