Seminar by Louise Chiocchetti

Three-dimensional array processing for wind tunnel analysis of aeroacoustic noise generated by obstacles in flows

Thesis work carried out at the PPRIME institute (Poitiers) will be presented at this seminar, concerning aerodynamic noise generated by obstacles within a flow. The identification of these aeroacoustic sources is generally carried out in a plane using a planar array. Here, to analyze these sources in a volume, a three-dimensional array is used, composed of 1024 microphones forming a tunnel around the test section of an anechoic wind tunnel. The aeroacoustic sources from acoustically compact objects are dipolar, and for some, their orientation varies in spaces (e.g., for curved obstacles or combinations of obstacles). An inverse method is thus implemented, which does not require any prior assumptions about the orientation of the sources, and allows to determine the orientation of dipoles and their level in space.