TY - JOUR N2 - 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. L1 - http://www.czasopisma.pan.pl/Content/112809/PDF/aoa.2019.129262.pdf L2 - http://www.czasopisma.pan.pl/Content/112809 PY - 2019 IS - No 3 EP - 474 DO - 10.24425/aoa.2019.129262 KW - Particle Image Velocimetry KW - acoustics of music instruments KW - organ pipes KW - edge aerophones A1 - Hruška, Viktor A1 - Dlask, Pavel PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 44 DA - 2019.10.04 T1 - Investigation of the Sound Source Regions in Open and Closed Organ Pipes SP - 467 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/112809 T2 - Archives of Acoustics ER -