Semi-empirical methods for determining the efflux velocity from a ship's propeller

W. Lam, Gerard A. Hamill, Desmond J. Robinson, S. Raghunathan

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    The present study proposed the semi-empirical methods for determining the efflux velocity from a ship's propeller. Ryan [1] defined the efflux velocity as the maximum velocity taken from a time-averaged velocity distribution along the initial propeller plane. The Laser Doppler Anemometry (LDA) and Computational Fluid Dynamics (CFD) were used to acquire the efflux velocity from the two propellers with different geometrical characteristics. The LDA and CFD results were compared in order to investigate the equation derived from the axial momentum theory. The study confirmed the validation of the axial momentum theory and its linear relationship between the efflux velocity and the multiplication of the rotational speed, propeller diameter and the square root of thrust coefficient. The linear relationship of these two terms is connected by an efflux coefficient and the value of this efflux coefficient reduced when the blade number increased.
    LanguageEnglish
    Pages14-24
    Number of pages11
    JournalApplied Ocean Research
    Volume35
    Issue numbernull
    DOIs
    Publication statusPublished - Mar 2012

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    Ship propellers
    Propellers
    Momentum
    Computational fluid dynamics
    Lasers
    Velocity distribution

    Cite this

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    title = "Semi-empirical methods for determining the efflux velocity from a ship's propeller",
    abstract = "The present study proposed the semi-empirical methods for determining the efflux velocity from a ship's propeller. Ryan [1] defined the efflux velocity as the maximum velocity taken from a time-averaged velocity distribution along the initial propeller plane. The Laser Doppler Anemometry (LDA) and Computational Fluid Dynamics (CFD) were used to acquire the efflux velocity from the two propellers with different geometrical characteristics. The LDA and CFD results were compared in order to investigate the equation derived from the axial momentum theory. The study confirmed the validation of the axial momentum theory and its linear relationship between the efflux velocity and the multiplication of the rotational speed, propeller diameter and the square root of thrust coefficient. The linear relationship of these two terms is connected by an efflux coefficient and the value of this efflux coefficient reduced when the blade number increased.",
    author = "W. Lam and Hamill, {Gerard A.} and Robinson, {Desmond J.} and S. Raghunathan",
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    Semi-empirical methods for determining the efflux velocity from a ship's propeller. / Lam, W.; Hamill, Gerard A.; Robinson, Desmond J.; Raghunathan, S.

    In: Applied Ocean Research, Vol. 35, No. null, 03.2012, p. 14-24.

    Research output: Contribution to journalArticle

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    T1 - Semi-empirical methods for determining the efflux velocity from a ship's propeller

    AU - Lam, W.

    AU - Hamill, Gerard A.

    AU - Robinson, Desmond J.

    AU - Raghunathan, S.

    PY - 2012/3

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    AB - The present study proposed the semi-empirical methods for determining the efflux velocity from a ship's propeller. Ryan [1] defined the efflux velocity as the maximum velocity taken from a time-averaged velocity distribution along the initial propeller plane. The Laser Doppler Anemometry (LDA) and Computational Fluid Dynamics (CFD) were used to acquire the efflux velocity from the two propellers with different geometrical characteristics. The LDA and CFD results were compared in order to investigate the equation derived from the axial momentum theory. The study confirmed the validation of the axial momentum theory and its linear relationship between the efflux velocity and the multiplication of the rotational speed, propeller diameter and the square root of thrust coefficient. The linear relationship of these two terms is connected by an efflux coefficient and the value of this efflux coefficient reduced when the blade number increased.

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