Fan 2022 conference - Senlis (France) 6-8 April 2022 - International Conference on Fan Noise, Aerodynamics, Applications and Systems

Technical Program

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Investigation of Forward and Backward Sweep Axial Fan Noise Sources using Lattice-Boltzmann Method


E2 Noise Prediction by Analytical / Numerical Methods


Université de Sherbrooke

Génie Mécanique
Sherbrooke - Canada

École de Technologie Supérieure

Génie Mécanique
Montréal - Canada

MOREAU Stéphane
Université de Sherbrooke

Génie Mécanique
Sherbrooke - Canada

Valeo Thermal Systems

Simulation and Reliability Metier
La Verrière - France


Low speed axial fan used in automotive industry contributes to rising noise pollution levels in the environment that is necessary to mitigate. In this study, we simulated the impact of sweep on noise levels and compared with unswept fan by using Lattice-Boltzmann method. Different inlet configurations study showed that in the experiment the strong inflow distortion is present. The quality of an incoming flow field is also responsible for higher broadband levels and tonal noise in absence of a stator in the spectra. The leading edge and trailing edge flow field details agrees very well with experimental recordings. The analysis showed that the swept blades alter the aerodynamic flow field. The backward sweep exhibit reduced blade loading near tip and increased leakage flow. The weak turbulent structures formed due to roll up of leakage flow that interacted with the blade near tip and acts as a major noise source. The standard deviation of pressure contours on blade suggest the potential noise sources. Finally, the noise spectra from simulation is validated with experiment showed a very good agreement.