A Comparative Study of Conventional and Tip-Fin Propeller Performance

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    During more than a decade several attempts have been made to obtain higher propeller efficiencies by radically modifying the geometry in the tip region of the blade. In the tip-fin propeller a tip fin or winglet is attached to the blade tip and integrated into the blade in such a way that the blade tip is softly curved towards the suction side.Whereas the developments previously have been concentrated mainly on increasing the efficiency of the propeller, the emphasis of current efforts has been on both high efficiency as well as good cavitation properties. This has resulted in a design with a combination of skew and tip fin. To evaluate the design, open-water, self-propulsion and cavitation model tests have been carried out. The tests are done for the conventional propeller originally designed for the ship and for a tip-fin propeller designed for the same ship under the same operation conditions.The results of the model tests show higher open-water efficiency of the tip-fin propeller as well as higher over-all propulsive efficency. Depending on the method used in the full-scale extrapolation this corresponds to reduction in propulsive power of 3.7 to 4.7 per cent. Both propellers suffer from slight wake field behind the ship. The tip-fin propeller suffered a little more from cavitation than the conventional propeller which gave rise to maximum, measured, first-order pressure pulses of 1.3 to 1.4 times those of the conventional propeller.
    Original languageEnglish
    Title of host publicationTwenty-First Symposium on Naval Hydrodynamics
    Place of PublicationWashington
    PublisherNational Academy Press
    Publication date1997
    Publication statusPublished - 1997
    EventTwenty-First Symposium on Naval Hydrodynamics - Trondheim, Norway
    Duration: 24 Jun 199628 Jun 1996
    Conference number: 21


    ConferenceTwenty-First Symposium on Naval Hydrodynamics

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