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Development of Secondary Flow Field in a Low Solidity Diffuser in a Transonic Centrifugal Compressor Stage

[+] Author Affiliations
Duccio Bonaiuti, Andrea Arnone

University of Florence, Florence, Italy

Chunill Hah

NASA Glenn Research Center, Cleveland, OH

Hiroshi Hayami

Kyushu University, Kasuga, Fukuoka, Japan

Paper No. GT2002-30371, pp. 445-454; 10 pages
doi:10.1115/GT2002-30371
From:
  • ASME Turbo Expo 2002: Power for Land, Sea, and Air
  • Volume 5: Turbo Expo 2002, Parts A and B
  • Amsterdam, The Netherlands, June 3–6, 2002
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-3610-X | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

In the present paper, the flow structure inside a low-solidity diffuser of a transonic compressor was investigated in detail. Steady computations were carried out and compared to experimental data. The secondary flow development inside the diffuser was analyzed and the reason for the stall inception was detected. Unsteady calculations were performed for two operating points, one close to the choke and the other one close to the stall of the compressor, in order to assess the effect of the unsteadiness in the diffuser secondary flow development.

Copyright © 2002 by ASME

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