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    The Ducted Tip—A Hydrofoil Tip Geometry With Superior Cavitation Performance

    Source: Journal of Fluids Engineering:;1995:;volume( 117 ):;issue: 004::page 665
    Author:
    S. I. Green
    ,
    S. Z. Duan
    DOI: 10.1115/1.2817320
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A novel hydrofoil design, consisting of a small diameter flow-through duct affixed to the tip, has been studied. The tip vortex cavitation inception index, σi , of this hydrofoil geometry is about a factor of 2 lower than that of a conventional rounded hydrofoil tip. This inception improvement comes with little associated performance penalty. For angles of attack greater than 8 deg the noncavitating lift-drag ratio is actually superior to that of an unducted hydrofoil of equal span, although with lower wing loadings the hydrofoil performance is diminished by application of the ducted tip. The ducted tip is effective at reducing the tip vortex inception index because, in contrast with the rounded tip, for which vorticity in the Trefftz plane is confined to a line, the ducted tip shed vorticity at the trailing edge is distributed over a line and circle. Distributing the vorticity in this fashion causes the trailing vortex to roll up less tightly, and hence have a higher core pressure and lower σi , than a conventional hydrofoil tip. It is also suspected that the interaction at the microscale level between the flow through the duct, and the flow around it, makes the vortex core size larger, and therefore σi smaller. The ducted tip design has many potential marine applications, including to ship and submarine propellers, submarine control fins, and ship rudders.
    keyword(s): Cavitation , Geometry , Hydrofoil , Vorticity , Wake turbulence , Flow (Dynamics) , Ducts , Design , Ships , Underwater vehicles , Wings , Propellers , Pressure , Microscale devices , Vortices , Fins AND Drag (Fluid dynamics) ,
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      The Ducted Tip—A Hydrofoil Tip Geometry With Superior Cavitation Performance

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    http://yetl.yabesh.ir/yetl1/handle/yetl/115464
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    • Journal of Fluids Engineering

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    contributor authorS. I. Green
    contributor authorS. Z. Duan
    date accessioned2017-05-08T23:47:27Z
    date available2017-05-08T23:47:27Z
    date copyrightDecember, 1995
    date issued1995
    identifier issn0098-2202
    identifier otherJFEGA4-27099#665_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/115464
    description abstractA novel hydrofoil design, consisting of a small diameter flow-through duct affixed to the tip, has been studied. The tip vortex cavitation inception index, σi , of this hydrofoil geometry is about a factor of 2 lower than that of a conventional rounded hydrofoil tip. This inception improvement comes with little associated performance penalty. For angles of attack greater than 8 deg the noncavitating lift-drag ratio is actually superior to that of an unducted hydrofoil of equal span, although with lower wing loadings the hydrofoil performance is diminished by application of the ducted tip. The ducted tip is effective at reducing the tip vortex inception index because, in contrast with the rounded tip, for which vorticity in the Trefftz plane is confined to a line, the ducted tip shed vorticity at the trailing edge is distributed over a line and circle. Distributing the vorticity in this fashion causes the trailing vortex to roll up less tightly, and hence have a higher core pressure and lower σi , than a conventional hydrofoil tip. It is also suspected that the interaction at the microscale level between the flow through the duct, and the flow around it, makes the vortex core size larger, and therefore σi smaller. The ducted tip design has many potential marine applications, including to ship and submarine propellers, submarine control fins, and ship rudders.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThe Ducted Tip—A Hydrofoil Tip Geometry With Superior Cavitation Performance
    typeJournal Paper
    journal volume117
    journal issue4
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.2817320
    journal fristpage665
    journal lastpage672
    identifier eissn1528-901X
    keywordsCavitation
    keywordsGeometry
    keywordsHydrofoil
    keywordsVorticity
    keywordsWake turbulence
    keywordsFlow (Dynamics)
    keywordsDucts
    keywordsDesign
    keywordsShips
    keywordsUnderwater vehicles
    keywordsWings
    keywordsPropellers
    keywordsPressure
    keywordsMicroscale devices
    keywordsVortices
    keywordsFins AND Drag (Fluid dynamics)
    treeJournal of Fluids Engineering:;1995:;volume( 117 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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