1988
DOI: 10.1121/1.395881
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Measurement and analysis of the noise radiated by low Mach number centrifugal blowers

Abstract: The wave equation was integrated numerically by the finite-element method, using a number of different combinations of the acoustic impedance and the scaling parame. ters. For comparison, the acoustic field of the same propeller in free space was also computed.The calculations show that at flow speeds much less than that of sound, the wall must be lined with acoustical absorbers to make the free-field and ducted-propeller models agree in acoustic-pressure levels and directionality. The best agreement Would occ… Show more

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“…108 A fundamental study of sound sources in low-Machnumber centrifugal blowers was done by Yeager. 109 He extended the correlation theory of Siddon to include sound intensity, thereby allowing investigations of the local radiation field from turbulent interactions with rigid surfaces. Correlation studies were performed on stationary blade sections immersed in turbulent flow using probe microphones and miniature pressure sensors.…”
Section: B Identification Of Noise Sources and Noise Reductionmentioning
confidence: 99%
“…108 A fundamental study of sound sources in low-Machnumber centrifugal blowers was done by Yeager. 109 He extended the correlation theory of Siddon to include sound intensity, thereby allowing investigations of the local radiation field from turbulent interactions with rigid surfaces. Correlation studies were performed on stationary blade sections immersed in turbulent flow using probe microphones and miniature pressure sensors.…”
Section: B Identification Of Noise Sources and Noise Reductionmentioning
confidence: 99%