Caractérisation des sources de bruit aérodynamique sur un ventilateur centrifuge à flux axial

C. RAFFAITIN; M. ROGER; L. RUFER; M. FABICKI

doi:doi:10.1051/jp4:19945216

Issue		J. Phys. IV France Volume 04, Number C5, Mai 1994 3ème Congrés français d'acoustique 3rd French conference on acoustics


Page(s)		C5-985 - C5-988
DOI		https://doi.org/10.1051/jp4:19945216

3ème Congrés français d'acoustique
3rd French conference on acoustics

J. Phys. IV France 04 (1994) C5-985-C5-988
DOI: 10.1051/jp4:19945216

Caractérisation des sources de bruit aérodynamique sur un ventilateur centrifuge à flux axial

C. RAFFAITIN¹, M. ROGER², L. RUFER² and M. FABICKI²

¹ ABB Solyvent-Ventec, 143 rue de la République, BP. 67, 69882 Meyzieu cedex, France
² Ecole Centrale de Lyon, 36 avenue Guy de Collongue, BP. 163, 69131 Ecully cedex, France

Abstract
This paper is an experimental investigation of the aerodynamic noise sources in a centrifugal fan with outlet guide vanes and axial outflow. Special piezoplastic sensors are used for the measurement of the pressure fluctuations on the blades. Classical signal processing procedures provide the blade loadings harmonics. When the fan operates at a relatively high flow rate and low efficiency, it is verified that higher loading harmonics are responsible for the noise emitted at the blade passing frequency. Conversely, at the maximum efficiency, only the first loading harmonic is noticeable, and the tone noise is suppressed.