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Air jet and edge tone simulation in an organ pipe foot model

 
: Rucz, Péter

International Institute of Noise Control Engineering -INCE-:
Noise control for quality of life. 42nd International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2013. Vol.7 : 15 - 18 September 2013, Innsbruck, Austria
Red Hook, NY: Curran, 2014
ISBN: 978-1-63266-267-5
S.5971-5980
International Congress and Exposition on Noise Control Engineering (Inter-Noise) <42, 2013, Innsbruck>
Englisch
Konferenzbeitrag
Fraunhofer IBP ()

Abstract
The sound generation of labial organ pipes is a complex physical process, since it involves fluid flow and acoustical phenomena inherently coupled. When a pipe is played air flows through the pipe foot and a thin jet of air emerges in the windway. As this jet hits the upper lip an edge tone is produced, which provides the excitation for the acoustic resonator. The edge tone and its interaction with the resonator is of key importance to the sound quality of the pipe. We report and evaluate CFD simulations of the aforementioned air jet using 2D and 3D geometries with a laminar and a Large Eddy Simulation (LES) model. In the first configuration no upper lip is present and the jet can be considered free. The quality of simulation results is assessed by means of comparison to reproducible hot wire anemometer measurements carried out on a high precision pipe foot model. With the upper lip being part of the model, the jet shows oscillating behavior around the edge. We also present flow simulation of this setup and evaluate the mode frequencies of the resulting edge tone. It is found that by extending the flow model into three dimensions the quality of CFD simulations is improved remarkably, achieving better fit to mesurement results both in the free jet and edge tone configurations.

: http://publica.fraunhofer.de/dokumente/N-307022.html