Experimental investigation of the aerodynamic noise radiated by a three-dimensional bluff body

Jeoffrey Fischer (1) , Laurent-Emmanuel Brizzi (1) , Janick Laumonier (1) , Vincent Valeau (1)

1 PPrime [Poitiers] - Institut Pprime [UPR 3346]

The reduction of aerodynamic noise is an important aspect of the development of recent cars in automotive industry. The present work is an experimental study of the aerodynamic noise radiated by a three-dimensional simplified automotive model. This body is investigated through velocity (Particle Image Velocimetry), wall pressure and far-field acoustic measurements in an anechoic wind-tunnel at low Mach number (below 0.15). After an aerodynamic characterization of the generated flow, the goal is to discuss the localization of acoustic sources in the vicinity of the model. Therefore, different methods of acoustic imaging, based on the beamforming technique, are performed by using an Underbrink multi-arm spiral array. The array is successively located laterally and above the model. The techniques used are previously validated numerically and experimentally. Results show the contribution of the different noise sources (leading edge, roof, A-pillar vortex and strut) depending on the frequency.

Domaines: Acoustique [physics.class-ph]

Jeoffrey Fischer, Laurent-Emmanuel Brizzi, Janick Laumonier, Vincent Valeau. Experimental investigation of the aerodynamic noise radiated by a three-dimensional bluff body. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810899⟩