Structure of diffuser stall and unsteady vortices in a centrifugal compressor with vaned diffuser

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

    7 Citations (Scopus)

    Abstract

    The characteristics of a diffuser rotating stall and the evolution of a vortex generated on the diffuser leading edge (i.e., leading-edge vortex (LEV)) in a centrifugal compressor were investigated using experiments and numerical analyses. The experimental results showed that both impeller and diffuser rotating stalls occurred at 55 and 25 Hz during off-design flow operation. Both the stall cells existed only on the shroud side of the flow passages, which is in close proximity to the source location of the LEV. The numerical results showed that the LEV is a combination of a separated vortex near the leading edge and the extended tip-leakage flow from the impeller. In the partial flow operation, the LEV develops as the velocity decreases in the diffuser passages and forms a huge flow blockage within the diffuser passages. Therefore, the LEV may be considered to be one of the causes of diffuser stall in the centrifugal compressor.

    Original languageEnglish
    Title of host publicationTurbomachinery
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Volume2D-2016
    ISBN (Electronic)9780791849729
    DOIs
    Publication statusPublished - 2016
    EventASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016 - Seoul, Korea, Republic of
    Duration: 2016 Jun 132016 Jun 17

    Other

    OtherASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition, GT 2016
    CountryKorea, Republic of
    CitySeoul
    Period16/6/1316/6/17

    ASJC Scopus subject areas

    • Engineering(all)

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  • Cite this

    Fujisawa, N., Ikezu, S., & Ota, Y. (2016). Structure of diffuser stall and unsteady vortices in a centrifugal compressor with vaned diffuser. In Turbomachinery (Vol. 2D-2016). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2016-56154