Article

Setup for experimental study of porous plate acoustics and local flow features (de)

* Presenting author
Day / Time: 08.03.2023, 09:40-10:00
Room: Saal Y4
Typ: Regulärer Vortrag
Abstract: Porous plates are investigated as a means to reduce trailing-edge noise in the greater effort to reduce aircraft noise pollution. Inspired by nature's silent flier, the owl, porosity has been shown to be effective for noise reduction in previous theoretical and experimental works, where a single dimensionless parameter controls the effects of porosity on the sound field. Prior experiments using a vortex ring have validated predictions to the sound scaling on flight speed and associated changes in directivity, and we seek to test now the acoustics and flow features of porous plates characterized by this same dimensionless porosity parameter in a wind tunnel. A phased microphone array and subsequent beamforming analysis enable the collection of detailed source maps near the porous edge, and radially-spaced microphones measure the directivity changes of the generated noise. In addition to acoustic measurements, flow measurements are taken with a hot-wire probe. This approach enables the investigation of how local flow changes due to geometric details of the plate porosity might affect the overall flow about the plate and the aerodynamic sound field. Notable acoustic and flow measurement results will be presented and compared across the range of the dimensionless porosity parameter.
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