Abstract
A comparison between microphone array measurements in closed and open test sections of wind tunnels using a generic 3-element high-lift system is presented. Aeroacoustic and aerodynamic measurements were performed simultaneously in order to be able to examine their respective test section-dependent characteristics and their influences on aeroacoustic sound generation and propagation. The study focuses on the beamforming results in both wind tunnel types with respect to source maps, relative and absolute levels of beamforming results and integrated spectra by considering the aerodynamic performance in terms of the resulting lift and static pressure distribution along the model. In both wind tunnels the same phased microphone array is used for the measurements, whereby the aim is to keep the experimental setup and conditions as close to identical as possible in both cases in order to be able to examine the test section-dependent effects. In addition, an in-flow calibration sound source incorporated in an electromechanic driver and with known characteristics is used for characterizing the influence of the different flow conditions in the different test sections on the sound propagation and their influence on beamforming results.
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