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TECHNICAL PAPERS

A Study on Impeller-Diffuser Interaction—Part I: Influence on the Performance

[+] Author and Article Information
Kai U. Ziegler, Heinz E. Gallus, Reinhard Niehuis

RWTH Aachen, University of Technology, Institute of Jet Propulsion and Turbomachinery, 52062 Aachen, Germany www.ist.rwth-aachen.de

J. Turbomach 125(1), 173-182 (Jan 23, 2003) (10 pages) doi:10.1115/1.1516814 History: Received October 26, 2001; Online January 23, 2003
Copyright © 2003 by ASME
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References

Pfleiderer, C., 1961, Die Kreiselpumpen für Flüssigkeiten und Gase, Springer-Verlag, Berlin, Göttingen, Heidelberg.
Dean, R. C., 1971, “On the Unresolved Fluid Dynamics of the Centrifugal Compressor,” Advanced Centrifugal Compressors, ASME Gas Turbine Division.
Hayami, H., Umemoto, A., 1995, “Effects of Inlet Passage Width Contraction of Low Solidity Cascade Diffusers on Performance of Transonic Centrifugal Compressor,” 95-YOKOHAMA-IGTC-15, Proc. Yokohama International Gas Turbine Congress.
Japikse, D., 1996, Centrifugal Compressor Design and Performance, Concepts ETI, Inc.
Krain,  H., 1981, “A Study on Centrifugal Impeller and Diffuser Flow,” ASME J. Eng. Power, 103, pp. 688–697.
Inoue,  M., and Cumpsty,  N. A., 1984, “Experimental Study of Centrifugal Impeller Discharge Flow in Vaneless and Vaned Diffusers,” ASME J. Eng. Gas Turbines Power, 106, pp. 455–467.
Fowler,  H. S., 1968, “The Distribution and Stability of Flow in a Rotating Channel,” ASME J. Eng. Power, 90, pp. 229–236.
Filipenco, V. G., Deniz, S., Johnston, J. M., Greitzer, E. M., and Cumpsty, N. A., 1998, “Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers—Part 1: Discrete-Passage Diffuser,” ASME Paper 98-GT-473.
Deniz, S., Greitzer, E. M., and Cumpsty, N. A., 1998, “Effects of Inlet Flow Field Conditions on the Performance of Centrifugal Compressor Diffusers—Part 2: Straight-Channel Diffuser,” ASME Paper 98-GT-474.
Yamane, T., Fujita, H., and Nagashima, T., 1993, “Transonic Discharge Flows Around Diffuser Vanes From a Centrifugal Impeller,” ISABE Paper 93-7053.
Dawes, W. N., 1994, “A Simulation of the Unsteady Interaction of a Centrifugal Impeller with its Vaned Diffuser: Flow Analysis,” ASME Paper 94-GT-105.
Liu, Z., and Hill, D. L., 2000, “Issues Surrounding Multiple Frames of Reference Models for Turbo Compressor Applications,” Proc. 15th Int. Compressor Engineering Conference at Purdue University, West Lafayette, IN.
Rodgers, C., 1982, “The Performance of Centrifugal Compressor Channel Diffusers,” ASME Paper 82-GT-10.
Jin, D., Jiang, Z., Hasemann, H., Haupt, U., and Rautenberg, M., 1995, “Influence of Vaned Diffuser on Dangerous Blade Vibration Due to Blade Flow Interactions in a Centrifugal Compressor,” ASME Paper 95-GT-122.
Shum, Y. K. P., Tan, C. S., and Cumpsty, N. A., 2000, “Impeller-Diffuser Interaction in Centrifugal Compressor,” ASME Paper 2000-GT-428.
Salvage,  J. W., 1999, “Development of Centrifugal Compressor With a Variable Geometry Split-Ring Pipe Diffuser,” ASME J. Turbomach., 121, pp. 295–303.
Justen,  F., Ziegler,  K. U., and Gallus,  H. E., 1999, “Experimental Investigation of Unsteady Flow Phenomena in a Centrifugal Compressor Vaned Diffuser of Variable Geometry,” ASME J. Turbomach., 121, pp. 763–771.
Ziegler, K. U., Justen, F., Rothstein, M., Gallus, H. E., Niehuis, R., 2000, “Research on a Centrifugal Compressor of Variable Geometry,” Proc., 15th Int. Compressor Engineering Conference at Purdue University, West Lafayette, IN.
Rothstein, M., 1993, “Entwicklung und experimentelle Untersuchung eines Radialverdichters mit beschaufeltem Diffusor variabler Geometrie,” doctoral thesis, RWTH, Aachen.
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Figures

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Stage with dismounted front wall
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Adjustable geometry parameters α4SS and r4/r2
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Sectional view of the centrifugal compressor
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Measurement planes in sectional view
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Operating points of probe measurements (nred/n0=0.8)
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Operating points of L2F measurements
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Probe measurement technique
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Maximum total temperature (Hi3) at 8M (α4SS=16.5 deg,nred/n0=0.8)
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Averaged static pressure at 2M (nred/n0=0.8)
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Averaged total pressures in four measurement planes (nred/n0=0.8)
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Averaged Mach numbers in three measurement planes (nred/n0=0.8)
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Total pressure loss (ω) and pressure recovery (cp) of diffuser and [diffuser+collector](α4SS=16.5 deg,nred/n0=0.8)
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Static pressure ratio of [diffuser+collector](nred/n0=0.8)
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Isentropic efficiencies (total/total) of impeller, [impeller+diffuser1],[impeller+diffuser+collector](nred/n0=0.8)
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Comparison of the total pressure distributions at diffuser vane exit (7M, nred/n0=0.8)
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Mach number at 7M (α4SS=16.5 deg,r4/r2=1.14,nred/n0=0.8)
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Mach number at 7M (α4SS=16.5 deg,r4/r2=1.04,nred/n0=0.8)
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Mach number at 8M (α4SS=16.5 deg,r4/r2=1.18,nred/n0=0.8)
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Mach number at 8M (α4SS=16.5 deg,r4/r2=1.04,nred/n0=0.8)

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