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

Yutaka Ohta, Eleuke Outa, Klyohiro 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 onedimensional 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 publicationTurbomachinery
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791878835
DOIs
Publication statusPublished - 1994
EventASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, GT 1994 - The Hague, Netherlands
Duration: 1994 Jun 131994 Jun 16

Publication series

NameProceedings of the ASME Turbo Expo
Volume1

Other

OtherASME 1994 International Gas Turbine and Aeroengine Congress and Exposition, GT 1994
Country/TerritoryNetherlands
CityThe Hague
Period94/6/1394/6/16

ASJC Scopus subject areas

  • General Engineering

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