Unsteady behavior of diffuser stall in a centrifugal compressor with vaned diffuser

    研究成果: Conference contribution

    4 引用 (Scopus)

    抜粋

    In this study, the unsteady behavior of a diffuser rotating stall in a centrifugal compressor with a vaned diffuser was investigated through experiments and numerical analyses. From the casing static pressure measurements, it was determined that the diffuser stall propagated at 25% of impeller rotational speed in the vaneless space. The numerical results revealed the presence of a typical vortical structure on the diffuser's leading edge. Under partial flow condition, a tornado-Type vortex was generated on the diffuser's leading edge. Furthermore, a longitudinal vortex at the shroud/suction surface corner (i.e., leading edge vortex (LEV)) was induced by the rolling-up flow on the diffuser suction surface. As the velocity was decreased, the development of the tornado-Type vortex and LEV forms a substantial flow blockage within the diffuser passages. Furthermore, the diffuser stall cell was caused by the systematic vortical structure which consisted of the tornado-Type vortex, LEV, and vortex in the throat area of diffuser passages. In addition to this, the developed LEV interacted with the next diffuser leading edge and formed the throat area blockage with the passage of time. Then, the tornado-Type vortex and LEV developed by the throat area blockage and diffuser stall cell, which was caused by the systematic vortical structure, propagated to the succeeding diffuser vane. Therefore, the diffuser stall in the centrifugal compressor was caused by the evolution of the tornado-Type vortex and LEV.

    元の言語English
    ホスト出版物のタイトルTurbomachinery
    出版者American Society of Mechanical Engineers (ASME)
    2D-2017
    ISBN(電子版)9780791850817
    DOI
    出版物ステータスPublished - 2017
    イベントASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017 - Charlotte, United States
    継続期間: 2017 6 262017 6 30

    Other

    OtherASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition, GT 2017
    United States
    Charlotte
    期間17/6/2617/6/30

    ASJC Scopus subject areas

    • Engineering(all)

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  • これを引用

    Fujisawa, N., Ema, D., & Ota, Y. (2017). Unsteady behavior of diffuser stall in a centrifugal compressor with vaned diffuser. : Turbomachinery (巻 2D-2017). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2017-63400