Rotating instability in a centrifugal blower with shrouded impeller

C. K P Kowshik, Daisuke Tsugita, Yusuke Takeyama, Yutaka Ota

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

    2 Citations (Scopus)

    Abstract

    Rotating instability in various types of fans, compressors, and pumps is considered as one of the symptoms of unsteady phenomena such as rotating stall or surge, and it is observed before a rotating stall as an amplitude increase in the power spectra of velocity fluctuation and/or radiated noise. In this paper, the cause of rotating instability in a centrifugal blower with a shrouded impeller is investigated through both experiments and numerical simulations. Experimental results show that the rotating instability may be attributed to unsteady vortices rotating along the impeller periphery and that a discrete noise component induced by the rotating instability is mainly caused by the interaction between unsteady vortices and the impeller discharge flow. A significant amplitude increase within a frequency band at almost half the blade passing frequency is found to be caused by an irregular change in the vortex rotating speed as well as by an irregular time interval in the train of generated vortices. In the numerical study, the structure and circumferential characteristics of the rotating vortices are investigated by a visualization technique using Qdefinition. Circumferential characteristics of the rotating vortices may be largely influenced by the steady characteristics of the impeller discharge flow field, which are determined by the geometric configuration of the impeller and the scroll casing.

    Original languageEnglish
    Title of host publicationProceedings of the ASME Turbo Expo
    Pages685-694
    Number of pages10
    Volume3
    DOIs
    Publication statusPublished - 2012
    EventASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012 - Copenhagen
    Duration: 2012 Jun 112012 Jun 15

    Other

    OtherASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012
    CityCopenhagen
    Period12/6/1112/6/15

    Fingerprint

    Blowers
    Vortex flow
    Power spectrum
    Frequency bands
    Fans
    Compressors
    Flow fields
    Visualization
    Pumps
    Computer simulation
    Experiments

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Kowshik, C. K. P., Tsugita, D., Takeyama, Y., & Ota, Y. (2012). Rotating instability in a centrifugal blower with shrouded impeller. In Proceedings of the ASME Turbo Expo (Vol. 3, pp. 685-694) https://doi.org/10.1115/GT2012-68266

    Rotating instability in a centrifugal blower with shrouded impeller. / Kowshik, C. K P; Tsugita, Daisuke; Takeyama, Yusuke; Ota, Yutaka.

    Proceedings of the ASME Turbo Expo. Vol. 3 2012. p. 685-694.

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

    Kowshik, CKP, Tsugita, D, Takeyama, Y & Ota, Y 2012, Rotating instability in a centrifugal blower with shrouded impeller. in Proceedings of the ASME Turbo Expo. vol. 3, pp. 685-694, ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, GT 2012, Copenhagen, 12/6/11. https://doi.org/10.1115/GT2012-68266
    Kowshik CKP, Tsugita D, Takeyama Y, Ota Y. Rotating instability in a centrifugal blower with shrouded impeller. In Proceedings of the ASME Turbo Expo. Vol. 3. 2012. p. 685-694 https://doi.org/10.1115/GT2012-68266
    Kowshik, C. K P ; Tsugita, Daisuke ; Takeyama, Yusuke ; Ota, Yutaka. / Rotating instability in a centrifugal blower with shrouded impeller. Proceedings of the ASME Turbo Expo. Vol. 3 2012. pp. 685-694
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