Evaluation and prediction of blade-passing frequency noise generated by a centrifugal blower

Yutaka Ota, Eisuke Outa, Kiyohiro Tajima

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

    Abstract

    The blade-passing frequency noise, abbreviated to BPF noise, of low specific speed centrifugal blower is analyzed by separating the frequency-response of the transmission passage and the intensity of the noise source. Frequency-response has previously been evaluated by the authors using a one-dimensional linear wave model, and the results have agreed well with the experimental response in a practical range of the blower speed. In the present study, the intensity of the noise source is estimated by introducing the quasi-steady model of the blade wake impingement on the scroll surface. The effective location of the noise source is determined by analyzing the cross-correlation between measured data of the blower suction noise and pressure fluctuation on the scroll surface. Then, the surface density distribution of a dipole noise source is determined from pressure fluctuation expressed in terms of quasi-steady dynamic pressure of the traveling blade wake. Finally, the free-field noise level is predicted by integrating the density spectrum of the noise source over the effective source area. The sound pressure level of the blower suction noise is easily predicted by multiplying the free-field noise level by the frequency-response characteristics of the noise transmission passage.

    Original languageEnglish
    Title of host publicationAmerican Society of Mechanical Engineers (Paper)
    PublisherPubl by ASME
    Pages1-11
    Number of pages11
    Publication statusPublished - 1994
    EventProceedings of the International Gas Turbine and Aeroengine Congress and Exposition - Hague, Neth
    Duration: 1994 Jun 131994 Jun 16

    Other

    OtherProceedings of the International Gas Turbine and Aeroengine Congress and Exposition
    CityHague, Neth
    Period94/6/1394/6/16

    Fingerprint

    Blowers
    Turbomachine blades
    Frequency response
    Acoustic noise
    Acoustic waves

    ASJC Scopus subject areas

    • Mechanical Engineering

    Cite this

    Ota, Y., Outa, E., & Tajima, K. (1994). Evaluation and prediction of blade-passing frequency noise generated by a centrifugal blower. In American Society of Mechanical Engineers (Paper) (pp. 1-11). Publ by ASME.

    Evaluation and prediction of blade-passing frequency noise generated by a centrifugal blower. / Ota, Yutaka; Outa, Eisuke; Tajima, Kiyohiro.

    American Society of Mechanical Engineers (Paper). Publ by ASME, 1994. p. 1-11.

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

    Ota, Y, Outa, E & Tajima, K 1994, Evaluation and prediction of blade-passing frequency noise generated by a centrifugal blower. in American Society of Mechanical Engineers (Paper). Publ by ASME, pp. 1-11, Proceedings of the International Gas Turbine and Aeroengine Congress and Exposition, Hague, Neth, 94/6/13.
    Ota Y, Outa E, Tajima K. Evaluation and prediction of blade-passing frequency noise generated by a centrifugal blower. In American Society of Mechanical Engineers (Paper). Publ by ASME. 1994. p. 1-11
    Ota, Yutaka ; Outa, Eisuke ; Tajima, Kiyohiro. / Evaluation and prediction of blade-passing frequency noise generated by a centrifugal blower. American Society of Mechanical Engineers (Paper). Publ by ASME, 1994. pp. 1-11
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    abstract = "The blade-passing frequency noise, abbreviated to BPF noise, of low specific speed centrifugal blower is analyzed by separating the frequency-response of the transmission passage and the intensity of the noise source. Frequency-response has previously been evaluated by the authors using a one-dimensional linear wave model, and the results have agreed well with the experimental response in a practical range of the blower speed. In the present study, the intensity of the noise source is estimated by introducing the quasi-steady model of the blade wake impingement on the scroll surface. The effective location of the noise source is determined by analyzing the cross-correlation between measured data of the blower suction noise and pressure fluctuation on the scroll surface. Then, the surface density distribution of a dipole noise source is determined from pressure fluctuation expressed in terms of quasi-steady dynamic pressure of the traveling blade wake. Finally, the free-field noise level is predicted by integrating the density spectrum of the noise source over the effective source area. The sound pressure level of the blower suction noise is easily predicted by multiplying the free-field noise level by the frequency-response characteristics of the noise transmission passage.",
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    N2 - The blade-passing frequency noise, abbreviated to BPF noise, of low specific speed centrifugal blower is analyzed by separating the frequency-response of the transmission passage and the intensity of the noise source. Frequency-response has previously been evaluated by the authors using a one-dimensional linear wave model, and the results have agreed well with the experimental response in a practical range of the blower speed. In the present study, the intensity of the noise source is estimated by introducing the quasi-steady model of the blade wake impingement on the scroll surface. The effective location of the noise source is determined by analyzing the cross-correlation between measured data of the blower suction noise and pressure fluctuation on the scroll surface. Then, the surface density distribution of a dipole noise source is determined from pressure fluctuation expressed in terms of quasi-steady dynamic pressure of the traveling blade wake. Finally, the free-field noise level is predicted by integrating the density spectrum of the noise source over the effective source area. The sound pressure level of the blower suction noise is easily predicted by multiplying the free-field noise level by the frequency-response characteristics of the noise transmission passage.

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