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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

Josuhn-Kadner, B., and Hoffman, B., 1992, “Investigations on a Radial Compressor Tandem-Rotor Stage With Adjustable Geometry,” ASME Paper No. 92-GT-218.
Boyce, M. P., and Nishida, A., 1977, “Investigation of Flow in Centrifugal Impeller With Tandem Inducer,” Tokyo Joint Gas Turbine Congress, Paper No. 43.
Bache, G., 1992, “Impeller Tandem Blade Study With Grid Embedding for Logical Grid Refinement,” Tenth Workshop for Computational Fluid Dynamic Applications in Rocket Propulsion, NASA Conference Publication 3163, Part 1.
Cheng, G. C., Chen, Y. S., Garcia, R., and Williams, R. W., 1993, “CFD Parametric Study of Consortium Impeller,” Eleventh Workshop for Computational Fluid Dynamic Application in Rocket Propulsion, NASA Conference Publication 3221, Part 1.
Josuhn-Kadner, B., 1994, “Flow Field and Performance of a Centrifugal Compressor Rotor With Tandem Blades of Adjustable Geometry,” ASME Paper No. 94-GT-13.
Peeters,  M. E., Habashi,  W. G., Nguyen,  B. Q., and Kotiuga,  P. L., 1992, “Finite Element Solutions of the Navier–Stokes Equations for Compressible Internal Flows,” J. Propul. Power, 8, No. 1, pp. 192–198.
Hughes,  T. J. R., 1987, “Recent Progress in the Development and Understanding of SUPG Methods With Special Reference to the Compressible Euler and Navier–Stokes Equations,” Int. J. Numer. Methods Fluids, 7, pp. 1261–1275.
Robichaud, M., Habashi, W., Peeters, M., Dutto, L., and Fortin, M., 1995, “Parallel Finite Element Computation of 3D Compressible Turbomachinery Flows on Workstation Clusters,” in Solution Techniques for Large-Scale CFD Problems, W. G. Habashi, ed., pp. 41–56.
Haroutunian, V., and Engelman, M. S., 1991, “On Modeling Wall-Bound Turbulent Flow Using Specialized Near-Wall Finite Elements and the Standard k–ε Turbulence,” in: Advances in Numerical Simulation of Turbulent Flows, ASME FED-Vol. 117, p. 97.

Figures

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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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Radial velocity distortion parameter (r) at trailing edge + 3 percent versus clocking fraction (λs)
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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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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=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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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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Predicted impeller slip factor versus clocking fraction (λs)
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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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Sample computational grid for tandem-impeller
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Comparison of conventional and tandem-impeller meridional gas-path profiles
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Nomenclature for tandem-impeller clocking arrangement
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Three-dimensional representation of tandem-impeller design (λs=5 percent configuration shown)

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