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The “Whistler Nozzle” and Horn as Aero-acoustic Sound Sources in Pipe Systems

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The production of self sustained pulsations in a “whistler nozzle” is analysed in terms of the periodic shedding of vortices. It is shown that very high acoustic velocities can be obtained by combining the nozzle with an upstream side branch. Acoustic velocities of half the main flow velocity have been observed in a nozzle with rounded edges. In a similar way, in combination with a closed side branch a horn appears to be a powerful sound source.

Zusammenfassung

Die Entstehung selbsterregter Schwingungen in einer ,,pfeifenden Düse“ wird auf der Grundlage periodisch sich ablösender Wirbel untersucht. Es wird gezeigt, daß sehr hohe Schallschnellen durch Kombination der Düse mit einem stromaufwärts gerichteten Seitenzweig erreicht werden kann. In einer Düse mit abgerundeten Kan ten wurden Schallschnellen von der halben Strömungsgeschwindigkeit beobachtet. In ähnlicher Weise scheint die Kombination eines Horns mit einem geschlossenen Seitenzweig eine leistungsfähige Schallquelle zu sein.

Sommaire

On associe la production de pulsations auto-entretenues dans une «tuyère sifflante» avec l'émission périodique de tourbillons. En montant en amont d'une telle tuyère un embranchement latéral formé d'un tronçon de tuyau fermé, on obtient des vitesses acoustiques très élevées qui peuvent atteindre la moitié de la vitesse moyenne de l'écoulement dans la tuyère lorsque les angles de celleci sont arrondis. De plus, si l'on monte un pavilion en aval du conduit latéral fermé, le système de tuyaux ainsi obtenu se révèle une source aéro-acoustique de haute puissance.
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Document Type: Research Article

Publication date: April 1, 1989

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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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