This paper describes two-dimensional trailing edge noise measurements in open and closed test section wind tunnels. The investigations are related to the EU-funded project SIROCCO, which aims to find quiet airfoils for wind turbines without a decrease in aerodynamic performance. Trailing edge noise measurements were performed in the open jet of the Aeroacoustic Wind Tunnel Braunschweig (AWB) using a phased microphone array. In addition, the trailing edge noise of the same models was measured in the closed section of the Laminar Wind Tunnel Stuttgart (LWT), using the new Coherent Particle Velocity (CPV) method. This method is based on the cross correlation of two hot-wire signals. The experimental results obtained in the two wind tunnels could be quantitatively compared after application of appropriate wind tunnel corrections. The sound pressure frequency spectra are basically parallel in the range of sufficient measurement accuracy. The total sound pressure levels vs. lift coefficient show a more or less constant offset of about 2 dB between AWB and LWT. Given the totally different measurement principles this can be regarded as a very good agreement.
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