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Advances in Aircraft and Spacecraft Science Volume 3, Number 3, July 2016 , pages 259-269 DOI: https://doi.org/10.12989/aas.2016.3.3.259 |
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Flow-induced interior noise from a turbulent boundary layer of a towed body |
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J. Abshagen, D. Küter and V. Nejedl
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| Abstract | ||
| In this work results from an underwater experiment on flow-induced noise in the interior of a towed body generated from a surrounding turbulent boundary layer are presented. The measurements were performed with a towed body under open sea conditions at towing depths below 100 m and towing speeds ranging from 2.4 m/s to 6.2 m/s (4 kn to 12 kn). Focus is given in the experiments to the relation between (outer) wall pressure fluctuations and the (inner) hydroacoustic near-field on the reverse side of a flat plate. The plate configuration consists of a sandwich structure with an (thick) outer polyurethane layer supported by an inner thin layer from fibre-reinforced plastics. Parameters of the turbulent boundary layer are estimated in order to analyse scaling relations of wall-pressure fluctuations, interior hydroacoustic noise, and the reduction of pressure fluctuations through the plate. | ||
| Key Words | ||
| interior flow noise; turbulent boundary layer; underwater experiment | ||
| Address | ||
| J. Abshagen, D. Küter and V. Nejedl : Research Department for Underwater Acoustics and Marine Geophysics (FWG), Bundeswehr Technical Centre WTD 71, Berliner Stra | ||
