Noise reduction and surge margin improvement using tapered diffuser vane in a centrifugal compressor

Takashi Goto, Eri Ohmoto, Yutaka Ota, Eisuke Outa

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    3 Citations (Scopus)


    Improvement of surge margin and reduction of interaction tone noise radiated from a centrifugal compressor with a vaned diffuser is discussed from experiments and CFD analyses. Two types of one-side tapered diffuser vanes, which are shroud- and hub-side tapered vanes, were used in the experiments. The height of the leading edge of the tapered vanes varied from 100% to 10%. Both types of tapered vanes are effective for the reduction of the interaction tone noise radiated from the compressor, because of the smaller interaction area between impeller-discharge flow and diffuser vane surface. Especially, the hub-side tapered diffuser vane suppresses the evolution of the leading-edge vortex, which causes reverse-flow in the diffuser passage. Furthermore, the hub-side tapered diffuser vane, which has an optimized diffuser leading edge shape, can improve the compressor pressure-rise characteristics at low-flow operation and can enlarge the surge margin.

    Original languageEnglish
    Pages (from-to)21-25
    Number of pages5
    JournalJournal of Thermal Science
    Issue number1
    Publication statusPublished - 2010 Mar



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

    ASJC Scopus subject areas

    • Condensed Matter Physics

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