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TECHNICAL PAPERS

On the Development and Application of the Fast-Response Aerodynamic Probe System in Turbomachines—Part 3: Comparison of Averaging Methods Applied to Centrifugal Compressor Measurements

[+] Author and Article Information
Pascal Köppel, Christian Roduner, Peter Kupferschmied, 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), 527-535 (Feb 01, 1999) (9 pages) doi:10.1115/1.1303820 History: Received February 01, 1999
Copyright © 2000 by ASME
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References

Figures

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Cross-sectional view of the centrifugal compressor with fast-response aerodynamic probe
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Top view of the diffuser showing probe position I
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Example: Compression of the time-resolved absolute flow angle αE into the time-averaged distribution of αE over the traverse
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Revolution ensemble-averaged pressure p̃1(t) during one impeller revolution (deterministic part of the pressure fluctuation) and the stochastic part represented through the ensemble standard deviation. Running conditions: BP; outlet of impeller, traverse position z/b=0.18.
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Averaged deterministic and stochastic pressure fluctuation over traverse position (z/b) obtained from different ensemble-averaging strategies. Running conditions: BP; impeller outlet, position I.
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Time-mean velocity profile and averaged deterministic radial fluctuations over traverse position (z/b). Running conditions: BP.
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Stage work aa across the traverse obtained from different averaging methods. Running conditions: BP.
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Radial velocity across the traverse obtained from different averaging methods. Running conditions: BP.
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Static pressure across the traverse obtained from different averaging methods. Running conditions: BP.
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Stage work during a MS period obtained from different averaging methods. Running conditions: MS.
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Radial velocity during a MS period obtained with different averaging methods. Running conditions: MS.

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