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Akustische Impedanz einer luftdurchströmten Öffnung

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The reflection coefficient and the acoustic impedance of tube orifices with flow discharge are measured by the method of the impedance tube. Flow velocities up to 150 m/s are used. With a flow discharge the reflection coefficient of the orifice is strongly increased, the orifice becoming more pressure release, whereas with suction the reflection coefficient decreases. The real part of the orifice impedance even becomes negative at low frequencies. The effects of the flow are reduced by grids and screens inserted into the orifice. At the low frequency limit the static pressure drop acts like an increase of the resistance part of the impedance.
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Document Type: Research Article

Publication date: January 1, 1965

More about this publication?
  • 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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