Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser

Nobumichi Fujisawa, Shotaro Hara, Yutaka Ota, Takashi Goto

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

    5 Citations (Scopus)

    Abstract

    Experiments and numerical analyses were used to investigate the unsteady behavior of a vortex generated on the leading-edge of a diffuser (i.e., leading-edge vortex (LEV)) and the diffuser stall inception in a centrifugal compressor equipped with vaned diffusers. The LEV is distinct from the separation vortex of the diffuser's leading edge and passage vortex of the diffuser; it is generated by the accumulation of vortices caused by the velocity gradient of the impeller discharge flow. The LEV increases with decreasing velocity in the diffuser passage and forms a huge flow blockage within the diffuser passage. Therefore, the LEV may help cause the diffuser stall inception in the centrifugal compressor. A diffuser vane, that was tapered only on the hub side was designed and used in the experiment. The results of the computational fluid dynamics analysis and experiments showed that the tapered diffuser vane can suppress LEV evolution during off-design operations. Therefore, the tapered diffuser vane may control the diffuser stall inception in a centrifugal compressor by suppressing LEV evolution.

    Original languageEnglish
    Title of host publicationAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM
    PublisherAmerican Society of Mechanical Engineers (ASME)
    Volume1B
    ISBN (Print)9780791846223
    DOIs
    Publication statusPublished - 2014
    EventASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2014, Collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels - Chicago
    Duration: 2014 Aug 32014 Aug 7

    Other

    OtherASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2014, Collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels
    CityChicago
    Period14/8/314/8/7

    Fingerprint

    Centrifugal compressors
    Vortex flow
    Diffusers (fluid)
    Experiments
    Dynamic analysis
    Computational fluid dynamics

    ASJC Scopus subject areas

    • Mechanical Engineering

    Cite this

    Fujisawa, N., Hara, S., Ota, Y., & Goto, T. (2014). Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM (Vol. 1B). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/FEDSM2014-21242

    Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser. / Fujisawa, Nobumichi; Hara, Shotaro; Ota, Yutaka; Goto, Takashi.

    American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM. Vol. 1B American Society of Mechanical Engineers (ASME), 2014.

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

    Fujisawa, N, Hara, S, Ota, Y & Goto, T 2014, Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser. in American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM. vol. 1B, American Society of Mechanical Engineers (ASME), ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting, FEDSM 2014, Collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels, Chicago, 14/8/3. https://doi.org/10.1115/FEDSM2014-21242
    Fujisawa N, Hara S, Ota Y, Goto T. Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser. In American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM. Vol. 1B. American Society of Mechanical Engineers (ASME). 2014 https://doi.org/10.1115/FEDSM2014-21242
    Fujisawa, Nobumichi ; Hara, Shotaro ; Ota, Yutaka ; Goto, Takashi. / Unsteady behavior of leading edge vortex and diffuser stall inception in a centrifugal compressor with vaned diffuser. American Society of Mechanical Engineers, Fluids Engineering Division (Publication) FEDSM. Vol. 1B American Society of Mechanical Engineers (ASME), 2014.
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