Role of the foot chamber in the sounding mechanism of a flue organ pipe

Two-demensional (2D) models of a flue organ pipe are studied with compressible fluid simulation, specifically compressible Large Eddy Simulation, focusing on the influence of the geometry of the flue and the foot on the jet motion and acoustic oscillation in the pipe. When the foot geometry is fixed...

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Bibliographic Details
Published inAcoustical Science and Technology Vol. 40; no. 1; pp. 29 - 39
Main Authors Tateishi, Shuhei, Iwagami, Sho, Tsutsumi, Genki, Kobayashi, Taizo, Takami, Toshiya, Takahashi, Kin'ya
Format Journal Article
LanguageEnglish
Published Tokyo ACOUSTICAL SOCIETY OF JAPAN 01.01.2019
Japan Science and Technology Agency
Subjects
Acoustic resonance
Acoustics
Chamfering
Compressible fluids
Computer simulation
Helmholtz resonator
Helmholtz resonators
Large eddy simulation
Organ foot
Organ pipe
Pipes
Steady state
Synchronism
Two dimensional models
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Summary:Two-demensional (2D) models of a flue organ pipe are studied with compressible fluid simulation, specifically compressible Large Eddy Simulation, focusing on the influence of the geometry of the flue and the foot on the jet motion and acoustic oscillation in the pipe. When the foot geometry is fixed, the models having a flue with chamfers show good performances in stabilizing the acoustic oscillation in the steady state. Furthermore, we find that the foot chamber works as a Helmholtz resonator. If the frequency of the acoustic oscillation in the pipe is higher than the resonance frequency of the Helmholtz resonator by almost the full-width at half-maximum, anti-phase synchronization between the acoustic oscillation in the pipe and that in the foot chamber occurs. In this case, the acoustic oscillation in the pipe grows rapidly in the attack transient and is stabilized in the steady state.
ISSN:1346-3969
1347-5177
DOI:10.1250/ast.40.29