Effect of rudder angle on propeller wash velocities at a seabed

D Ryan, G.A. Hamill, H. T. Johnston

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    17 Citations (Scopus)


    This paper deals with an experimental investigation intothe velocity distribution downstream of a propeller,operating at bollard pull conditions and in the presence ofa mobile sediment bed. Previous investigations eitherignored the effect of a rudder in the wash or consideredonly its influence on an unconfined jet. The velocityprofiles within the jet produced by a rotating propellerwith a rudder present were measured at a mobile bed andcompared to currently available predictive equations.The velocity distribution profiles in the jet, influenced bybed proximity, were found not to comply with currentpredictive methods. The velocity distributions measuredwithin the jet were found to be complex and nonsymmetrical.To provide a basic velocity predictive tool, aneural network analysis toolbox within Matlab wasutilised and trained using the experimental data.
    Original languageEnglish
    Pages (from-to)27-38
    JournalProceedings of the ICE - Maritime Engineering
    Issue numberMA1
    Publication statusPublished - Mar 2009


    • Scour
    • Propeller
    • Jet
    • Neural Network.


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