Predicting axial velocity profiles within a diffusing marine propeller jet

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    A full understanding of the hydrodynamic processes within the jet produced by a manoeuvring ship’s propeller is essential in the development and maintenance of ports, docks and harbours. In this study the predominant axial velocity component of a diffusing propeller jet was studied. The flow fields formed by four propellers, each operating at four power levels (speeds of rotation), were investigated under bollard pull conditions within a large free surface tank using Laser Doppler Anemometry. Comparison were made to existing methodologies by which a prediction of the magnitudes of the axial velocity can be made, and where deficient modifications to the methodologies have been developed. The jets were found to produce a maximum axial velocity along the initial efflux plane at a location near the blade mid-span. The position and magnitude of the axial velocity was seen to decrease as the jet entrained more flow and transitioned from the zone of flow establishment into the zone of established flow.
    LanguageEnglish
    Pages104-112
    JournalOcean Engineering
    Volume124
    Early online date02 Aug 2016
    DOIs
    Publication statusPublished - 15 Sep 2016

    Fingerprint

    Propellers
    Ship propellers
    Docks
    Ports and harbors
    Flow fields
    Hydrodynamics
    Lasers

    Keywords

    • Propeller Jets, Scour, Ports, Dock and Harbours, Hydraulics & Hydrodynamics

    Cite this

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    title = "Predicting axial velocity profiles within a diffusing marine propeller jet",
    abstract = "A full understanding of the hydrodynamic processes within the jet produced by a manoeuvring ship’s propeller is essential in the development and maintenance of ports, docks and harbours. In this study the predominant axial velocity component of a diffusing propeller jet was studied. The flow fields formed by four propellers, each operating at four power levels (speeds of rotation), were investigated under bollard pull conditions within a large free surface tank using Laser Doppler Anemometry. Comparison were made to existing methodologies by which a prediction of the magnitudes of the axial velocity can be made, and where deficient modifications to the methodologies have been developed. The jets were found to produce a maximum axial velocity along the initial efflux plane at a location near the blade mid-span. The position and magnitude of the axial velocity was seen to decrease as the jet entrained more flow and transitioned from the zone of flow establishment into the zone of established flow.",
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    author = "G.A. Hamill and C Kee",
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    Predicting axial velocity profiles within a diffusing marine propeller jet. / Hamill, G.A.; Kee, C.

    In: Ocean Engineering, Vol. 124, 15.09.2016, p. 104-112.

    Research output: Contribution to journalArticle

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