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J. Mar. Sci. Eng. 2018, 6(2), 45; https://doi.org/10.3390/jmse6020045

Experimental and Numerical Investigation of Propeller Loads in Off-Design Conditions

1
CNR-INSEAN, National Research Council—Marine Technology Research Institute, Via di Vallerano 139, 00128 Rome, Italy
2
CNR-IAC—Istituto per le Applicazioni del Calcolo, Via dei Taurini 19, 00185 Rome, Italy
*
Author to whom correspondence should be addressed.
Received: 27 February 2018 / Revised: 21 March 2018 / Accepted: 4 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Marine Propulsors)
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Abstract

The understanding of the performance of a propeller in realistic operative conditions is nowadays a key issue for improving design techniques, guaranteeing safety and continuity of operation at sea, and reducing maintenance costs. In this paper, a summary of the recent research carried out at CNR-INSEAN devoted to the analysis of propeller loads in realistic operative scenarios, with particular emphasis on the in-plane loads, is presented. In particular, the experimental results carried out on a free running maneuvering model equipped with a novel force transducer are discussed and supported by C F D (Computational Fluid Dynamics) analysis and the use of a simplified propeller model, based on Blade Element Momentum Theory, with the aim of achieving a deeper understanding of the mechanisms that govern the functioning of the propeller in off-design. Moreover, the analysis includes the scaling factors that can be used to obtain a prediction from model measurements, the propeller radial force being the primary cause of failures of the shaft bearings. In particular, the analysis highlighted that cavitation at full scale can cause the increment of in-plane loads by about 20% with respect to a non-cavitating case, that that in-plane loads could be more sensitive to cavitation than thrust and torque, and that Reynolds number effect is negligible. For the analysis of cavitation, an alternative version of the B E M T solver, improved with cavitation linear theory, was developed. View Full-Text
Keywords: off-design; propeller radial force; free running experiments; CFD maneuvering simulations; propeller models; scale effects; cavitation off-design; propeller radial force; free running experiments; CFD maneuvering simulations; propeller models; scale effects; cavitation
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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. (CC BY 4.0).
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Ortolani, F.; Dubbioso, G.; Muscari, R.; Mauro, S.; Di Mascio, A. Experimental and Numerical Investigation of Propeller Loads in Off-Design Conditions. J. Mar. Sci. Eng. 2018, 6, 45.

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