Effects of tapered diffuser vane on the flow field and noise of a centrifugal compressor

Yutaka Ohta*, Takashi Goto, Eisuke Outa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


The effects of a three-dimensional tapered diffuser vane on the flow field and noise radiated from a centrifugal compressor are investigated by both CFD analyses and experiments. Tapered diffuser vanes are very useful not only for the reduction of the interaction tone noise but also for the improvement of the pressure recovery characteristics within the diffuser passage. By using tapered diffuser vanes, the interaction area between the impeller-discharge flow and diffuser vanes becomes small, and then the noise level of the discrete tone can be reduced remarkably as a result. Furthermore, by utilizing the visualization technique of vortical structures based on the CFD results, the scale of vortex shedding leaving from the leading edge of the diffuser vanes is found to be contracted and a tendency for the turbulence level to decrease is observed. This may be the cause of the attenuation of broadband noise components. The secondary flow, which is considered to be an obstruction of diffuser pressure recovery, can also be suppressed by the tapered diffuser vanes, and the pressure decrease observed in the throat part of the diffuser passage is further reducible.

Original languageEnglish
Pages (from-to)301-308
Number of pages8
JournalJournal of Thermal Science
Issue number4
Publication statusPublished - 2007 Nov


  • CFD
  • Centrifugal compressor
  • Interaction tone noise
  • Tapered diffuser vane
  • Vortical structure

ASJC Scopus subject areas

  • Condensed Matter Physics


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