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Experiment and numerical simulation of denoising fillets of stern appendages on underwater vehicle
Author(s): 
Pages: 1345-1354
Year: Issue:  10
Journal: Journal of Ship Mechanics

Keyword:  underwater vehiclehorseshoe vortexdenoisingfillet of stern appendagenoise measurement;
Abstract: To reduce the noise of underwater vehicle, denoising fillets of stern appendages are investigated. The effect of the horseshoe vortexes generated at body-appendage junctions on the underwater vehicle wake is analyzed, and these horseshoe vortexes may exert adverse effects on the noise of underwater vehicle. A type of fillets of stern appendages adapted for an unmanned underwater vehicle (UUV) is designed. Its ef-fect on wake optimization is numerically simulated by Computational Fluid Dynamics (CFD) method. The results show that the circumferential non-uniformity of axial velocity at propeller disc is reduced by 35%-62%. To test the denoising performance of fillets of stern appendages, the noise of a voyaging underwater vehicle is measured. The results show that the overall sound source level of UUV noise is reduced by 3.4 dB when fillets of stern appendages are added. At low frequencies, its denoising performance is better.
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