Detailed stress tensor measurements in a centrifugal compressor vaneless diffuser


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Pinarbaşi A. , Johnson M.

JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME, cilt.118, ss.394-399, 1996 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 118
  • Basım Tarihi: 1996
  • Doi Numarası: 10.1115/1.2836654
  • Dergi Adı: JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
  • Sayfa Sayıları: ss.394-399

Özet

Detailed flow measurements have been made in the vaneless diffuser of a large low-speed centrifugal compressor using hot-wire anemometry. The three time mean velocity components and full stress tensor distributions have been determined on eight measurement planes within the diffuser. High levels of Reynolds stress result in the rapid mixing out of the blade wake. Although high levels of turbulent kinetic energy are Sound in the passage wake, they are not associated with strong Reynolds stresses and hence the passage wake mires out only slowly. Low-frequency meandering of the wake position is therefore likely to be responsible for the high kinetic energy levels. The anisotropic nature of the turbulence suggests that Reynold's stress turbulence models are required for CFD modeling of diffuser flows.