Characteristics of the blade-passing frequency noise of a centrifugal fan, and a method for noise reduction

Yutaka Ohta, Eisuke Outa, Kiyohiro Tajima

Research output: Contribution to journalArticle

4 Citations (Scopus)


Speed-dependent characteristics of centrifugal fan noise are discussed by introducing a model of wave transmission through the impeller and the inlet duct. The fan noise data at the inlet are categorized as source strength terms and a frequency-response term expressing attenuation in the propagation passage. By setting the exponent in a power-law relationship of the 2nd power of sound pressure level versus frequency at 6, i.e., a dipole source, two factors describing the source level are determined with simple relationships to the cut off clearance. The frequency response is satisfactorily predicted by introducing a one-dimensional linear wave model in which the key passage is the blade-to-blade passage selectively determined by the noise wavelength.

Original languageEnglish
Pages (from-to)199-209
Number of pages11
JournalJSME International Journal, Series B: Fluids and Thermal Engineering
Issue number2
Publication statusPublished - 1989 May 1


ASJC Scopus subject areas

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Fluid Flow and Transfer Processes

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