Archives of Acoustics, 44, 3, pp. 467–474, 2019

Investigation of the Sound Source Regions in Open and Closed Organ Pipes

Academy of Performing Arts in Prague, Music Acoustics Research Centre
Czech Republic

Academy of Performing Arts in Prague Music Acoustics Research Centre
Czech Republic

The airflow in the mouth of an open and closed flue organ pipe of corresponding geometrical proportions is studied. The phase locked particle image velocimetry with subsequent analysis by the biorthogonal decomposition is employed in order to compare the flow mechanisms and related features. The most significant differences lie in the mean velocity distribution and rapidity of the jet lateral motion. Remarks on the pressure estimation from PIV data and its importance for the aeroacoustic source terms are made and a specific example is discussed.
Keywords: particle image velocimetry; acoustics of music instruments; organ pipes; edge aerophones
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DOI: 10.24425/aoa.2019.129262