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

Yutaka Ohta, Takashi Goto, Eisuke Outa

研究成果: Article査読

22 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)301-308
ページ数8
ジャーナルJournal of Thermal Science
16
4
DOI
出版ステータスPublished - 2007 11

ASJC Scopus subject areas

  • Condensed Matter Physics

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