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Particle image velocimetry (PIV) measurements of velocity fields at an organ pipe labium
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
2003 (English)In: Proceedings of SMAC 03: Stockholm Music Acoustics Conference, August 6-9, 2003 / [ed] Roberto Bresin, Stockholm: Kungl. Tekniska Högskolan , 2003Conference paper (Refereed)
Abstract [en]

A pilot experiment is presented that measures velocity fields in two planes at a blown organ pipe labium for a fundamental tone at 260 Hz. The sound pressure is also measured at the same time as the velocity fields are registered. This makes it possible to follow the change of the velocity field as the sound pressure varies with time. The methods used are stereoscopic particle image velocimetry (PIV) and two-dimensional particle image velocimetry. The difference between the methods is that the first one measures three velocity components by use of two CCD cameras and the second one measures two velocity components with one camera. A double pulsed Nd:YAG laser is used as illuminating source. It gives short light pulses (~13 ns) necessary to resolve the quite high air velocity (~10 m/s). Results show that it is possible to follow a travelling vortex at the organ pipe labium in time as the sound pressure changes. The stereoscopic measurements show that the velocity fields are three-dimensional. The measurements have shown to be repeatable.

Place, publisher, year, edition, pages
Stockholm: Kungl. Tekniska Högskolan , 2003.
Research subject
Experimental Mechanics
URN: urn:nbn:se:ltu:diva-39704Local ID: e8e5d6c0-bb56-11db-b560-000ea68e967bOAI: diva2:1013221
Stockholm Music Acoustics Conference : 06/08/2003 - 09/08/2003
Godkänd; 2003; 20061026 (cira)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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