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Sound Propagation in Streaming Air within Tubes having Changes of Cross-Section and Flow Losses

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The reflection coefficient of smooth and sharp changes of the cross-section of a circular tube (inner diameter: 85 mm) is measured for frequencies between 0.3 kc/s and 1.5 kc/s and flow velocities up to 200 m/s. Moreover the dependence of the acoustic attenuation in a smooth rigid tube on the flow velocity is determined.

The acoustical performance of the smooth transitions agrees well with a theory by Powell in which an isentropic flow and a plane phase profile of the sound wave are assumed. Then the energy reflection coefficient is nearly independent of the flow velocity. Losses of acoustical energy are always occurring together with flow losses.
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Document Type: Research Article

Publication date: January 1, 1966

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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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