Wind tunnels are used in combination with phased array techniques or elliptic mirrors to localize and quantify the aerodynamic noise coming e.g. from an airfoil or a high-lift device. In this paper the authors describe measurements made in the acoustic wind tunnel (AWD) of the Institute of Acoustic and Speech Communication (IAS) at the Technical University of Dresden (TU-Dresden). A thin flat plate is positioned in the jet stream by a newly developed mounting device and investigated concerning the aerodynamic and acoustic properties. The aerodynamic measurements as well as simulations of the acoustic behavior of the flat plate will be presented in a parallel paper. These simulations are focused on trailing edge noise and are carried out with a newly developed code called SATIN. The acoustic measurements have been done using a 48-microphone phased array (Acoustic Array Stuttgart, AAS) with a random microphone pattern. The paper describes the solution of specific measurement problems and shows results from the acoustic measurements. Furthermore, the authors present an algorithm which allows to increase the performance, i.e. the sampling rate per channel, of multiplexing DAQ-Cards for steady state sound fields.
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