On the optimum performance of oscillating foil propulsors

Antonio Sánchez-Caja (Corresponding Author), Jussi Martio

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    Abstract

    The design of oscillating foil propulsors is considerably more complex than that of conventional propellers due to the large amount of geometric and kinematic parameters involved in the problem. No general use of such promising propulsion concept is made routinely yet since many open questions remain to be solved. One of such questions is the sensitivity of the propulsor efficiency to foil chord length that is much larger than for conventional propellers. Our focus is on this particular problem. A potential flow theory that estimates the main force components affecting the global performance of such devices is presented. The theory is applied to oscillating foils with heaving and pitching motions and to wheel propellers with foils describing trochoidal paths. Added mass terms that usually are neglected in efficiency analyses and that play an important role in determining the global performance are included. A parameter optimization procedure is introduced in this context. Comparison to experimental data and RANS computations is made.
    Original languageEnglish
    Pages (from-to)114-124
    Number of pages11
    JournalJournal of Marine Science and Technology
    Volume22
    Issue number1
    DOIs
    Publication statusPublished - 1 Mar 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Metal foil
    Propellers
    potential flow
    kinematics
    Potential flow
    Propulsion
    Wheels
    Kinematics
    parameter
    comparison

    Keywords

    • Added mass
    • Cycloidal propellers
    • Flapping foil
    • Foil wheel
    • Optimization
    • Oscillating foil

    Cite this

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    abstract = "The design of oscillating foil propulsors is considerably more complex than that of conventional propellers due to the large amount of geometric and kinematic parameters involved in the problem. No general use of such promising propulsion concept is made routinely yet since many open questions remain to be solved. One of such questions is the sensitivity of the propulsor efficiency to foil chord length that is much larger than for conventional propellers. Our focus is on this particular problem. A potential flow theory that estimates the main force components affecting the global performance of such devices is presented. The theory is applied to oscillating foils with heaving and pitching motions and to wheel propellers with foils describing trochoidal paths. Added mass terms that usually are neglected in efficiency analyses and that play an important role in determining the global performance are included. A parameter optimization procedure is introduced in this context. Comparison to experimental data and RANS computations is made.",
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    On the optimum performance of oscillating foil propulsors. / Sánchez-Caja, Antonio (Corresponding Author); Martio, Jussi.

    In: Journal of Marine Science and Technology, Vol. 22, No. 1, 01.03.2017, p. 114-124.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - On the optimum performance of oscillating foil propulsors

    AU - Sánchez-Caja, Antonio

    AU - Martio, Jussi

    N1 - ISI: ENGINEERING, MARINE

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    N2 - The design of oscillating foil propulsors is considerably more complex than that of conventional propellers due to the large amount of geometric and kinematic parameters involved in the problem. No general use of such promising propulsion concept is made routinely yet since many open questions remain to be solved. One of such questions is the sensitivity of the propulsor efficiency to foil chord length that is much larger than for conventional propellers. Our focus is on this particular problem. A potential flow theory that estimates the main force components affecting the global performance of such devices is presented. The theory is applied to oscillating foils with heaving and pitching motions and to wheel propellers with foils describing trochoidal paths. Added mass terms that usually are neglected in efficiency analyses and that play an important role in determining the global performance are included. A parameter optimization procedure is introduced in this context. Comparison to experimental data and RANS computations is made.

    AB - The design of oscillating foil propulsors is considerably more complex than that of conventional propellers due to the large amount of geometric and kinematic parameters involved in the problem. No general use of such promising propulsion concept is made routinely yet since many open questions remain to be solved. One of such questions is the sensitivity of the propulsor efficiency to foil chord length that is much larger than for conventional propellers. Our focus is on this particular problem. A potential flow theory that estimates the main force components affecting the global performance of such devices is presented. The theory is applied to oscillating foils with heaving and pitching motions and to wheel propellers with foils describing trochoidal paths. Added mass terms that usually are neglected in efficiency analyses and that play an important role in determining the global performance are included. A parameter optimization procedure is introduced in this context. Comparison to experimental data and RANS computations is made.

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    KW - Cycloidal propellers

    KW - Flapping foil

    KW - Foil wheel

    KW - Optimization

    KW - Oscillating foil

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