Boundary layer suction can be effective in delaying compressor surge, if the surge is triggered by flow separation on the shroud- or hub-casing. This work aims at positioning a suction slot in a radial vaned diffuser, which is thought to be the limiting component in a centrifugal compressor, such as the one considered here. The location of the slot is determined based on the results of both steady and unsteady flow simulations of a transonic centrifugal compressor of a turboshaft. Although the overall performance of the compressor is well-described by steady RANS, large discrepancies are observed between the steady and unsteady simulations of the diffuser flow, discrepancies imply different flow-separation scenarios. Steady results show more low-momentum fluid near the hub, whereas it is concentrated near the shroud in the unsteady simulations, hence no valid physical conclusions can be expected from the steady simulations. Analysis of the instantaneous skin-friction distribution from the unsteady simulations reveals that the separation is fixed and leads to a slot location on the shroud casing, near the diffuser main-vane suction side, so that it covers the range of separation saddle positions as the operating point is changed.
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December 2016
Research-Article
Comparison of Steady and Unsteady Flows in a Transonic Radial Vaned Diffuser
E. Benichou,
E. Benichou
Laboratoire de Mécanique des Fluides et
d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: emmanuel.benichou@ec-lyon.fr
d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: emmanuel.benichou@ec-lyon.fr
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I. Trébinjac
I. Trébinjac
Professor
Laboratoire de Mécanique des
Fluides et d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: isabelle.trebinjac@ec-lyon.fr
Laboratoire de Mécanique des
Fluides et d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: isabelle.trebinjac@ec-lyon.fr
Search for other works by this author on:
E. Benichou
Laboratoire de Mécanique des Fluides et
d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: emmanuel.benichou@ec-lyon.fr
d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: emmanuel.benichou@ec-lyon.fr
I. Trébinjac
Professor
Laboratoire de Mécanique des
Fluides et d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: isabelle.trebinjac@ec-lyon.fr
Laboratoire de Mécanique des
Fluides et d'Acoustique,
UMR CNRS 5509,
Ecole Centrale de Lyon,
UCB Lyon I, INSA,
36 Avenue Guy de Collongue,
Ecully Cedex 69134, France
e-mail: isabelle.trebinjac@ec-lyon.fr
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received September 3, 2015; final manuscript received April 14, 2016; published online June 1, 2016. Assoc. Editor: Ricardo F. Martinez-Botas.
J. Turbomach. Dec 2016, 138(12): 121002 (10 pages)
Published Online: June 1, 2016
Article history
Received:
September 3, 2015
Revised:
April 14, 2016
Citation
Benichou, E., and Trébinjac, I. (June 1, 2016). "Comparison of Steady and Unsteady Flows in a Transonic Radial Vaned Diffuser." ASME. J. Turbomach. December 2016; 138(12): 121002. https://doi.org/10.1115/1.4033481
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