Title: Modelling of broadband noise radiated by an airfoil-application to an axial fan

Authors: D. Fedala, S. Kouidri, F. Bakir, R. Rey

Addresses: Laboratoire d'Energetique et de Mecanique des Fluides Interne, Ecole Nationale Superieure d'Arts et Metiers, Paris, France. ' Laboratoire d'Energetique et de Mecanique des Fluides Interne, Ecole Nationale Superieure d'Arts et Metiers, Paris, France. ' Laboratoire d'Energetique et de Mecanique des Fluides Interne, Ecole Nationale Superieure d'Arts et Metiers, Paris, France. ' Laboratoire d'Energetique et de Mecanique des Fluides Interne, Ecole Nationale Superieure d'Arts et Metiers, Paris, France

Abstract: In this paper, a modelling of the broadband noise radiated by an axial subsonic fan is presented and validated. It is an extension of Amiet|s model predicting the broadband noise generated by an isolated airfoil. Two sources are analysed, incident turbulence interaction noise and trailing edge noise. It shows the dominance of the leading edge noise. The broadband noise directivity for axial fans presents a main radiation lobe along the fan axis for both mechanisms. It was observed that the leading edge acoustic spectra feature is very sensitive to the turbulence length scale of the incident flow.

Keywords: aeroacoustics; broadband noise; engine cooling fan; axial subsonic fans; isolated airfoils; incident turbulence interaction noise; trailing edge noise; radiation lobe; turbulent flows; automotive engines; vehicle noise.

DOI: 10.1504/IJVNV.2007.014400

International Journal of Vehicle Noise and Vibration, 2007 Vol.3 No.1, pp.106 - 117

Available online: 04 Jul 2007 *

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