Numerical prediction of scale effect on propeller bearing force of a four-screw ship
In case of a four-screw ship, the propellers show different hydrodynamics performance due to the asymmetric distribution of the wake. And the particularity of the scale effect on wake field for this type of ship would make a more complicated characteristics on propeller bearing force. In this paper,...
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Veröffentlicht in: | Ocean engineering 2021-06, Vol.229, p.108974, Article 108974 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | In case of a four-screw ship, the propellers show different hydrodynamics performance due to the asymmetric distribution of the wake. And the particularity of the scale effect on wake field for this type of ship would make a more complicated characteristics on propeller bearing force. In this paper, a numerical simulation study of scale effect on propeller unsteady bearing force of a four-screw ship was performed by employing RANS method. The load variation of the single-blade is analyzed to understand the fluid mechanism of the interaction between the propeller blade and wake flow. The larger wake field difference between inside and outside propeller disk aggravates the unbalanced load distribution for the full-scale ship. The results of propeller bearing force highlight that the fluctuation values of full-scale ship are smaller than those of model one. Moreover, the scale effect of outside propeller is strong with respect to the inside one. The above findings can provide theoretical guidance for load balancing and vibration reduction of the four-screw ships.
•The scale effect on propeller bearing force of a fully appended four-screw ship was calculated and analyzed by numerical simulations.•The research reveals that the difference of wake field between inside and outside disk owing to influence of the boundary layer flow.•The study indicates that the load difference between the internal and external propellers of the full-scale ship is 10.63%, while the model one is 4.2%, which is resulted from the scale effect of wake field.•The tangential velocity causes the asymmetric fluctuation of blade loads. The scale effect of brackets results in the variation of blade loads between model and full scale. |
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ISSN: | 0029-8018 1873-5258 |
DOI: | 10.1016/j.oceaneng.2021.108974 |