Effects of diffuser leading-edge geometries on performance and noise characteristics of a centrifugal compressor

Takashi Goto, Yutaka Ota, Eisuke Outa

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    The noise reduction radiated from a centrifugal compressor with vaned diffuser using hooked and tapered diffuser vane are discussed by experiments and CFD. Most dominant noise of the centrifugal compressor is interaction tone noise between impeller-discharged flow and diffuser leading-edge. Thus, the shape of diffuser leading-edge is important to reduce the noise level of interaction tone noise. In the experiments, the compressor performance by using hooked diffuser vane is deteriorated because of increase of the leakage-flow passing through the hooked portion while the hooked diffusers are able to reduce the noise level effectively. On the other hand, tapered diffuser vanes are able to reduce the noise and to maintain high compressor performance simultaneously. In the CFD, the twin vortices are generated by the leakage-flow passing through the tapered portion and the vortices induce secondary flow near the pressure surface at diffuser leading-edge and suppress the flow separation from the diffuser leading-edge.

    Original languageEnglish
    Pages (from-to)1229-1238
    Number of pages10
    JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
    Volume77
    Issue number777
    DOIs
    Publication statusPublished - 2011

    Fingerprint

    centrifugal compressors
    Centrifugal compressors
    diffusers
    leading edges
    Acoustic noise
    Compressors
    Computational fluid dynamics
    Vortex flow
    Diffusers (fluid)
    Geometry
    Flow separation
    Secondary flow
    geometry
    Noise abatement
    vanes
    Experiments
    compressors
    charge flow devices
    leakage
    vortices

    Keywords

    • Centrifugal compressor
    • CFD
    • Noise
    • Tapered diffuser vane
    • Turbomachinery

    ASJC Scopus subject areas

    • Mechanical Engineering
    • Condensed Matter Physics

    Cite this

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    abstract = "The noise reduction radiated from a centrifugal compressor with vaned diffuser using hooked and tapered diffuser vane are discussed by experiments and CFD. Most dominant noise of the centrifugal compressor is interaction tone noise between impeller-discharged flow and diffuser leading-edge. Thus, the shape of diffuser leading-edge is important to reduce the noise level of interaction tone noise. In the experiments, the compressor performance by using hooked diffuser vane is deteriorated because of increase of the leakage-flow passing through the hooked portion while the hooked diffusers are able to reduce the noise level effectively. On the other hand, tapered diffuser vanes are able to reduce the noise and to maintain high compressor performance simultaneously. In the CFD, the twin vortices are generated by the leakage-flow passing through the tapered portion and the vortices induce secondary flow near the pressure surface at diffuser leading-edge and suppress the flow separation from the diffuser leading-edge.",
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    AU - Ota, Yutaka

    AU - Outa, Eisuke

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    N2 - The noise reduction radiated from a centrifugal compressor with vaned diffuser using hooked and tapered diffuser vane are discussed by experiments and CFD. Most dominant noise of the centrifugal compressor is interaction tone noise between impeller-discharged flow and diffuser leading-edge. Thus, the shape of diffuser leading-edge is important to reduce the noise level of interaction tone noise. In the experiments, the compressor performance by using hooked diffuser vane is deteriorated because of increase of the leakage-flow passing through the hooked portion while the hooked diffusers are able to reduce the noise level effectively. On the other hand, tapered diffuser vanes are able to reduce the noise and to maintain high compressor performance simultaneously. In the CFD, the twin vortices are generated by the leakage-flow passing through the tapered portion and the vortices induce secondary flow near the pressure surface at diffuser leading-edge and suppress the flow separation from the diffuser leading-edge.

    AB - The noise reduction radiated from a centrifugal compressor with vaned diffuser using hooked and tapered diffuser vane are discussed by experiments and CFD. Most dominant noise of the centrifugal compressor is interaction tone noise between impeller-discharged flow and diffuser leading-edge. Thus, the shape of diffuser leading-edge is important to reduce the noise level of interaction tone noise. In the experiments, the compressor performance by using hooked diffuser vane is deteriorated because of increase of the leakage-flow passing through the hooked portion while the hooked diffusers are able to reduce the noise level effectively. On the other hand, tapered diffuser vanes are able to reduce the noise and to maintain high compressor performance simultaneously. In the CFD, the twin vortices are generated by the leakage-flow passing through the tapered portion and the vortices induce secondary flow near the pressure surface at diffuser leading-edge and suppress the flow separation from the diffuser leading-edge.

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