Unsteady behavior and control of diffuser leading-edge vortex in a centrifugal compressor

Yutaka Ota, Takashi Goto, Eisuke Outa

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    17 Citations (Scopus)

    Abstract

    The unsteady behavior of a vortex generated on the diffuser leading-edge, which is called the leading-edge vortex (LEV), is discussed through experiments and numerical simulation. The LEV is different from the separating vortex of the diffuser leading-edge and passage vortex of the diffuser, develops rapidly with a decrease in the compressor mass flow rate, and forms a flow blockage in diffuser passages. Therefore, the evolution of the LEV may become a cause of diffuser stall. Additionally, in one attempt to control the LEV, two types of tapered diffuser vanes, which are shroud- or hub-side tapered diffuser vanes, were adopted. Though the shroud-side tapered diffuser vane can effectively reduce the compressor noise level, the compressor performance deteriorates remarkably. On the other hand, the hub-side tapered diffuser vane not only reduces the compressor noise level but also improves the compressor performance. According to the visualization results of the oil-film methods and numerical simulations, the hub-side tapered diffuser vane can suppress the evolution of the LEV in the compressor low-flow-rate operation.

    Original languageEnglish
    Title of host publicationProceedings of the ASME Turbo Expo
    Pages1805-1813
    Number of pages9
    Volume7
    EditionPARTS A, B, AND C
    DOIs
    Publication statusPublished - 2010
    EventASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 - Glasgow
    Duration: 2010 Jun 142010 Jun 18

    Other

    OtherASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010
    CityGlasgow
    Period10/6/1410/6/18

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    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Ota, Y., Goto, T., & Outa, E. (2010). Unsteady behavior and control of diffuser leading-edge vortex in a centrifugal compressor. In Proceedings of the ASME Turbo Expo (PARTS A, B, AND C ed., Vol. 7, pp. 1805-1813) https://doi.org/10.1115/GT2010-22394