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International Journal of Rotating Machinery
Volume 2012 (2012), Article ID 823831, 15 pages
http://dx.doi.org/10.1155/2012/823831
Research Article

EFD and CFD Design and Analysis of a Propeller in Decelerating Duct

Department of Electrical, Electronic, Telecommunication Engineering and Naval Architecture (DITEN), University of Genoa, Via Montallegro 1, U16145 Genova, Italy

Received 7 September 2012; Accepted 6 November 2012

Academic Editor: Alessandro Corsini

Copyright © 2012 Stefano Gaggero et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Ducted propellers, in decelerating duct configuration, may represent a possible solution for the designer to reduce cavitation and its side effects, that is, induced pressures and radiated noise; however, their design still presents challenges, due to the complex evaluation of the decelerating duct effects and to the limited amount of available experimental information. In the present paper, a hybrid design approach, adopting a coupled lifting line/panel method solver and a successive refinement with panel solver and optimization techniques, is presented. In order to validate this procedure and provide information about these propulsors, experimental results at towing tank and cavitation tunnel are compared with numerical predictions. Moreover, additional results obtained by means of a commercial RANS solver, not directly adopted in the design loop, are also presented, allowing to stress the relative merits and shortcomings of the different numerical approaches.