H.V. Fuchs, D. Eckoldt, U. Essers, J. Potthoff

The vehicle wind tunnel at the University of Stuttgart is presently silenced so as to enable aeroacoustic testing both inside and outside the test objects at speeds up to 268 km/h. A novel silencer concept makes use of "membrane absorbers" as extremely thin splitters for the low frequencies and of the bending vanes suitably jacketed by porous material for the high frequencies. This U-bend silencer was optimized in both its aerodynamic and acoustic performance by extensive model and full-scale laboratory tests. It will enable the wind tunnel to be operated at its design speed with the permanent silencers reducing the fan noise by more than 30 dB in a sufficiently broad range of frequencies. For the acoustic lining of the open test section, a new type of acoustic broadband absorber was developed which requires a minimum in space and has again even and smooth surfaces in order to avoid any interference with the flow.

DGLR/AIAA 14th Aeroacoustics Conference, 1992

Conference Paper

englisch

21,0 x 29,7 cm, 10 Seiten

DGLR-Bericht, 1992, 1992-03, DGLR/AIAA 14th Aeroacoustics Conference - Proceedings; S.177-186; 1992; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

aeroacoustics

Bibliothek

1992