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TECHNICAL PAPERS

On the Development and Application of the Fast-Response Aerodynamic Probe System in Turbomachines—Part 2: Flow, Surge, and Stall in a Centrifugal Compressor

[+] Author and Article Information
Christian Roduner, Peter Kupferschmied, Pascal Köppel, Georg Gyarmathy

Turbomachinery Laboratory, Institute of Energy Technology, ETH—Swiss Federal Institute of Technology, 8092 Zurich, Switzerlande-mail: http://www.lsm.iet.ethz.ch/lsm/

J. Turbomach 122(3), 517-526 (Feb 01, 1999) (10 pages) doi:10.1115/1.1303827 History: Received February 01, 1999
Copyright © 2000 by ASME
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References

Figures

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General view of the centrifugal compressor test rig
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View of unshrouded impeller and diffuser (configuration: 24 blades, blade angle 25 deg)
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Geometry of the vaned diffuser
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Cross-sectional view of the centrifugal compressor with probe locations
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Top view of the diffuser with probe positions I to XI (gray numbers: positions not discussed herein)
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Sketch of the auxiliary cylinder used to eliminate probe-tip effects
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Performance map of the standard configuration of the centrifugal compressor
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Variation of the period length during MS, indicating minimum, maximum, and mean lengths of MS periods
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Impeller blade and wake positions at the instant of triggering
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Blade-resolved ensemble-averaged distribution of the radial velocity component near the impeller outlet (r*=1.05, position I). Running conditions: BP, Mu=0.75. Top: three-dimensional view; bottom: top view.
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As in Fig. 10 (top), measured at the leading edge radius (r*=1.16, position VI) of the diffuser vanes
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As in Fig. 10 (top), measured at the diffuser outlet (r*=1.70, position VII)
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Same as in Fig. 12, but measured at probe position IX
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Blade-resolved ensemble-averaged distribution of the radial velocity component at the impeller outlet (r*=1.05, position I) under steady low-flow running conditions (NS, Mu=0.75)
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Blade-resolved ensemble-averaged distribution of the radial velocity component at the impeller outlet (r*=1.05, position I) during mild surge (MS, Mu=0.75)
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Class-averaged Cr variation at midchannel, measured at three different diffuser positions plotted over one MS period (MS, Mu=0.75,z/b=0.48)
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Class-averaged static pressure variation during mild surge at midchannel, measured at three different diffuser positions, plotted over one MS period (MS, Mu=0.75,z/b=0.48)
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Class-averaged Cr distribution measured at the impeller exit during rotating stall (position I, r*=1.05) plotted over one RS period (RS, Mu=0.4)
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As in Fig. 18, but measured at the diffuser exit (position IX, r*=1.70)
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Class-averaged Cr variation during rotating stall, measured at midchannel at diffuser inlet and outlet, plotted over one RS period (RS, Mu=0.4,z/b=0.48)
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Same as in Fig. 20, showing the class-averaged total and static pressure variations

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