Characterisation and modelling of axial fan noise
Résumé
This paper presents experimental data concerning the noise produced by an axial fan. Acoustic measurements have been taken with point microphones and a microphone array both with and without a grid at the entrance to the fan to examine the e↵ect of incoming turbulence levels on noise. The acoustic data are used to evaluate a strip-wise turbulent in-flow analytical broadband noise model. Two propagation models are employed in the analytical model to predict far-field noise. The first is based on the spherical spreading of acoustic waves and the second uses an experimentally measured transfer function. The best results are obtained with the experimental transfer function employed in the strip-wise noise model as it can recreate some of the finer spectral features of the recorded noise.