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Experimental Investigation of the Flue Channel Geometry Influence on Edge-tone Oscillations

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Edge tone is usually investigated without considering the influence of the flue channel geometry. In this paper, four geometries known from previous work to influence strongly the jet behavior are investigated: a long channel with sharp angles at its exit, two long channels chamfered at their exit, one having a sharp 45 ° angle and the other with a rounded exit, and a short channel with sharp angles. Investigations include measurements of the radiated sound, of the force exerted by the fluid on the labium, and flow visualizations. Experimental results show in particular that the frequency emitted is greatly influenced by the channel length, and this can be linked to the strong influence this parameter has on the flow velocity profile. The dominant sound source is found to be of a dipolar nature, whatever geometrical configuration used, confirming and extending the results that Powell obtained in the case of the long channel with right angles. A sharp decline in the force exerted by the flow on the labium is observed at a certain transition velocity that is dependent on the channel length. This is linked to turbulence appearing in the jet before reaching the labium. Chamfers induce a dramatic decrease on the sound source strength, eventually preventing the system from oscillating when rounded chamfers are used. This effect cannot be interpreted in terms already stated and although hypotheses are discussed, chamfers still keep part of their mystery.
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Document Type: Research Article

Publication date: September 1, 2004

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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