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TECHNICAL PAPERS

Numerical Investigation of Tandem-Impeller Designs for a Gas Turbine Compressor

[+] Author and Article Information
Douglas A. Roberts, Suresh C. Kacker

Pratt & Whitney Canada, Mississauga, Ontario, Canada

J. Turbomach 124(1), 36-44 (Feb 01, 2001) (9 pages) doi:10.1115/1.1413472 History: Received February 01, 2001
Copyright © 2002 by ASME
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References

Figures

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Three-dimensional representation of tandem-impeller design (λs=5 percent configuration shown)
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Nomenclature for tandem-impeller clocking arrangement
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Comparison of conventional and tandem-impeller meridional gas-path profiles
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Sample computational grid for tandem-impeller
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Comparison of predicted impeller: (a) total-to-total pressure ratio, (b) isentropic efficiency, and (c) total temperature ratio at running line
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Predicted impeller slip factor versus clocking fraction (λs)
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Conventional impeller: (a–d) Mrel contours at 25, 50, 75, and 95 percent span; (e) Mrel contour at impeller trailing edge; (f) meridional (Cm) velocity contour at trailing edge + 3 percent
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Tandem-impeller (λs=0 percent): (a–d) Mrel contours at 25, 50, 75, and 95 percent span; (e) Mrel contour at impeller trailing edge; (f ) meridional (Cm) velocity contour at trailing edge + 3 percent
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Tandem-impeller (λs=5 percent): (a)–(d) Mrel contours at 25, 50, 75, and 95 percent span; (e) Mrel contour at impeller trailing edge; (f ) meridional (Cm) velocity contour at trailing edge + 3 percent
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Tandem-impeller (λs=50 percent): (a–d) Mrel contours at 25, 50, 75, and 95 percent span; (e) Mrel contour at impeller trailing edge; (f ) meridional (Cm) velocity contour at trailing edge + 3 percent
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Radial velocity distortion parameter (r) at trailing edge + 3 percent versus clocking fraction (λs)
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Impeller blade surface loading (isentropic relative Mach number) distributions at (a) 25, (b) 50, and (c) 95 percent span
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Hub-to-shroud profiles of pitch-averaged (a) total pressure, and (b) swirl (α) at trailing edge + 3 percent

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