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Double-Layer Microperforated Panel/Porous Absorber as Liner for Anechoic Closing of the Test Section in Wind Tunnels

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This work investigates the use of hybrid double-layer microperforated panel/porous systems as wideband absorbers for applications in the closing of the test area of wind tunnels. For such an application, the absorber should fulfil a twofold requirement: provide absorption in a frequency band ranging from 500 up to 14000 Hz, and the face in contact with the air vein must be free of porous material. The equations for calculating the absorption coefficient at normal incidence allows to predict the performance of such a system as a function of its constitutive parameters. A prototype providing average absorption of 94% in the frequency band (500, 14000) Hz is finally built and validated experimentally in both an impedance tube and a wind tunnel.
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Document Type: Research Article

Publication date: September 1, 2010

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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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