Trailing Edge Noise Computation of a Fan Blade Profile

Julien Christophe (1) , Stéphane Moreau (2) , Jérome Anthoine (1)

1 VKI - von Karman Institute for Fluid Dynamics
2 UdeS - Université de Sherbrooke

In problem involving noise generated by fans or high-lift devices in uniform stationary flow, trailing edge noise has a primary interest. This paper proposes to study the trailing edge noise produced by a Controlled-Diffusion (CD) airfoil specially developed for automotive engine cooling by Valeo. Several LES flow computations are realised using the Fluent solver 6.3 or the open source OpenFoam solver on different grids for a Reynolds number based on the chord of 1.5 10⁵ and an angle of attack of 8 degrees. The computations are compared to pressure and velocity measurements performed at ECL (France) and obtained by measurement techniques involving pressure probes and hot-wire anemometry. The results show the necessity of selecting proper boundary conditions and grid refinement in order to obtain correct flow prediction around the trailing edge. The far field noise is computed using different acoustic methods, the Ffowcs-Williams and Hall anology using velocity informations in a volume around the trailing edge and Amiet's theory using the pressure spectrum at the trailing edge. Both prediction methods are compared with microphone measurements.

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Julien Christophe, Stéphane Moreau, Jérome Anthoine. Trailing Edge Noise Computation of a Fan Blade Profile. 10ème Congrès Français d'Acoustique, Apr 2010, Lyon, France. ⟨hal-00541709⟩