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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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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