Unsteady flow structure in an axial compressor at windmill condition

Takashi Goto, Dai Kato, Yutaka Ota, Eisuke Outa

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

    8 Citations (Scopus)

    Abstract

    This study investigates experimentally and numerically unsteady flow fields in an axial compressor operating at highflow rate in order to understand the flow structure in the stator row operating at windmill condition. The experimental and numerical data are compared by time- And phase-lock-averaged techniques. Additionally, unsteady vortex structure is investigated by numerical technique. At windmill condition, the incidence angle to the stator row becomes extremely negative. Therefore, large separation occurs near pressure surface in the stator passage. The experimental and numerical results indicate that a large vortex is generated in the separation area. According to the numerical results, part of the vortex migrates downstream, and the vortex produces blockage of the main stream of the stator passage. Therefore, net flow area in the stator passage becomes small so that the flow between the vortex and suction side of stator vane is accelerated. As a result, the total pressure deterioration is generated in the stator passage because the high speed flow and the vortex cause high shear.

    Original languageEnglish
    Title of host publicationProceedings of the ASME Turbo Expo
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Volume2D
    ISBN (Print)9780791845639
    DOIs
    Publication statusPublished - 2014
    EventASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014 - Dusseldorf
    Duration: 2014 Jun 162014 Jun 20

    Other

    OtherASME Turbo Expo 2014: Turbine Technical Conference and Exposition, GT 2014
    CityDusseldorf
    Period14/6/1614/6/20

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    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Goto, T., Kato, D., Ota, Y., & Outa, E. (2014). Unsteady flow structure in an axial compressor at windmill condition. In Proceedings of the ASME Turbo Expo (Vol. 2D). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/GT2014-25609