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TECHNICAL PAPERS

Impeller–Diffuser Interaction in a Centrifugal Compressor

[+] Author and Article Information
Y. K. P. Shum, C. S. Tan

Gas Turbine Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139

N. A. Cumpsty

Whittle Laboratory, University of Cambridge, Cambridge, England CB3 0DY

J. Turbomach 122(4), 777-786 (Feb 01, 2000) (10 pages) doi:10.1115/1.1308570 History: Received February 01, 2000
Copyright © 2000 by ASME
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References

Figures

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Unstructured mesh used for the r2/r2=1.092 configuration with the casings of both impeller and diffuser removed
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Impeller total-to-total pressure ratio for the three different radial gap sizes, with the compete characteristic of r2/r2=1.092 case shown
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Mass and time-averaged total pressure distribution along the impeller passage for the three different radial gas sizes
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Effect of radial gap size on impeller total pressure ratio and static pressure ratio, expressed in incremental change from vaneless configuration
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Contours of entropy production ρDs/Dt at impeller exit for the vaneless configuration
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Contours of instantaneous entropy production ρDs/Dt at impeller exit collected at 0.25T time interval for the r2/r2=1.092 configuration
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Incremental entropy production Δ(ρDs/Dt) for the two vaned configurations when compared to the vaneless configuration
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Comparison of main blade clearance periodic tip leakage mass flux at 90, 95, and 99 percent meridional stations
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Comparison of periodic main blade tip loading (pps−pss)/(p02p2) at 90, 95, and 99 percent meridional stations
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Comparisons of pressure recovery Cp and loss Closs for calculations 2, 4, and 5
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Effect of unsteadiness on the swirl angle at midpitch of the diffuser inlet plane

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