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- W3190413321 abstract "The present work addresses the scattering of the tonal noise of a low-speed propeller bya rigid cylinder, both propeller and cylinder axes being parallel and at a short distance toeach other, for which a compact regime is reached. The propeller and cylinder diameters aresmall compared to the acoustic wavelengths, as well as the propeller-cylinder distance. Thisarrangement is considered as a generic configuration of installed marine propellers. Onlythe dipole-like sources of the hydrodynamic noise of the propeller are considered, assumingrigid blades. The sound radiation from the propeller is formulated in two dimensions, forcharacteristic spinning modes of the tonal noise, based on the exact Green’s function of thecylinder. The mode orders ±1 are found the only efficient ones in free field. In the presence ofthe cylinder, all higher-order modes are scattered into the contrarotating mode −1 with a strongamplification, whereas they would not radiate in free field. A simple experiment, performedin air but with Helmholtz numbers typical of marine applications, confirms the generation ofthe mode−1as a key behavior of the asymptotic Green’s function of the cylinder. The resultsshow that the installation effect is crucial for the analysis of marine propeller noise at very lowfrequencies. Cylinder scattering is also theoretically investigated for a pair of synchronizedcontra-rotating propellers. Basic differences between the non-compact and compact regimescharacteristic of aeronautical and naval applications, respectively, are highlighted." @default.
- W3190413321 created "2021-08-16" @default.
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- W3190413321 date "2021-07-28" @default.
- W3190413321 modified "2023-10-12" @default.
- W3190413321 title "On the very low frequency scattering of propeller noise by a neighboring cylinder" @default.
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- W3190413321 doi "https://doi.org/10.2514/6.2021-2251" @default.
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