Characterization of a Perforated Liner by Acoustic and Optical Measurements
Claus Heuwinkel, Estelle Piot, F. Micheli, André Fischer, Lars Enghardt, Friedrich Bake, Ingo Röhle · 2010
A comprehensive study of a perforated liner under bias and grazing ow is performed in three di erent test facilities. Microphone measurements are used to characterize the general performance of the liner. Laser Doppler Anemometry and Acoustic Particle Image Velocimetry measurements are applied to study the ow eld in the vicinity of the ori ces. The results allow a detailed interpretation of the relation between the damping performance and the ow structures, as well as a comprehensive comparison between the di erent test facilities and measurement techniques.