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TECHNICAL PAPERS

Numerical Investigation of Three-Dimensional Clocking Effects in a Low Pressure Turbine

[+] Author and Article Information
Andrea Arnone, Michele Marconcini, Alberto Scotti Del Greco

“Sergio Stecco” Department of Energy Engineering, University of Florence, Via di Santa Marta, 3, 50139 Firenze, Italy

Ennio Spano

Fiat Avio S.p.A.–Direzione Tecnica, Via Nizza, 312, 10127 Torino, Italy

J. Turbomach 126(3), 375-384 (Sep 03, 2004) (10 pages) doi:10.1115/1.1740780 History: Received December 01, 2002; Revised March 01, 2003; Online September 03, 2004
Copyright © 2004 by ASME
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References

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Figures

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Three-dimensional view of the grid
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H-type grid for the midspan section (177×73)
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Investigated clocking positions
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Evolution of the nondimensional lift coefficient amplitude harmonics; (a) 1st rotor, (b) 2nd rotor
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Efficiency variation versus 2nd stator clocking position
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Time-averaged entropy contours for maximum and minimum efficiency; (a) maximum efficiency, (b) minimum efficiency
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Instantaneous vorticity contours for maximum (left column) and minimum (right column) efficiency; (a) t/T=0.0, (b) t/T=0.2, (c) t/T=0.4, (d) t/T=0.6, (e) t/T=0.8
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Instantaneous vorticity contours and unsteady velocity vectors
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Time-averaged total pressure pitchwise distribution in front of the 2nd stator, three-dimensional midspan and quasi-three-dimensional; (a) maximum efficiency, (b) minimum efficiency
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Time-averaged p̃t contours in front of the 2nd stator; (a) ηmax−ΔϑS2=20%, (b) ηmin−ΔϑS2=60%
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Time-averaged total pressure pitchwise distributions in front of the 2nd stator at 10%, 50%, and 90% of the span; (a) 10% span, (b) 50% span, (c) 90% span
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Unsteady pressure coefficient distributions for the 2nd stator at 10%, 50%, and 90% of the span; (a) 10% span, (b) 50% span, (c) 90% span
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Unsteady pressure coefficient at leading edge versus clocking positions

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