Time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed propeller

W.H. Lam, Desmond J. Robinson, Gerard A. Hamill, J.F. Zhao, M. Jia

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The current study investigated the time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed ship propeller. The six-bladed propeller provided the rapid periodical pulses of thrust in one revolution due to the blades leading to a complex downstream jet. The six-bladed propeller is popular as a boat racing propeller, but the presentation of its flow structure was rarely found in the previous studies. In this study, the experiments were carried out in a water tank to measure the time-averaged velocity and turbulence intensity by using a Laser Doppler Anemometry (LDA) system. The jet was produced by rotating the propeller at a constant speed powered by an electric motor. The maximum tangential and radial velocities of the six-bladed propeller were of 76% and 17% of the maximum axial velocity respectively. The study found that the six-bladed propeller has a lower tangential velocity, but a higher radial velocity with its own diffusing mechanism when comparing to the three-bladed propeller.
    Original languageEnglish
    Pages (from-to)85-93
    Number of pages8
    JournalOcean Engineering
    Volume51
    Issue numbernull
    DOIs
    Publication statusPublished - 01 Sep 2012

    Fingerprint

    Propellers
    Turbulence
    Ship propellers
    Water tanks
    Electric motors
    Boats
    Flow structure
    Lasers
    Experiments

    Cite this

    @article{c95e9534f075430fb43555c29113c082,
    title = "Time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed propeller",
    abstract = "The current study investigated the time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed ship propeller. The six-bladed propeller provided the rapid periodical pulses of thrust in one revolution due to the blades leading to a complex downstream jet. The six-bladed propeller is popular as a boat racing propeller, but the presentation of its flow structure was rarely found in the previous studies. In this study, the experiments were carried out in a water tank to measure the time-averaged velocity and turbulence intensity by using a Laser Doppler Anemometry (LDA) system. The jet was produced by rotating the propeller at a constant speed powered by an electric motor. The maximum tangential and radial velocities of the six-bladed propeller were of 76{\%} and 17{\%} of the maximum axial velocity respectively. The study found that the six-bladed propeller has a lower tangential velocity, but a higher radial velocity with its own diffusing mechanism when comparing to the three-bladed propeller.",
    author = "W.H. Lam and Robinson, {Desmond J.} and Hamill, {Gerard A.} and J.F. Zhao and M. Jia",
    year = "2012",
    month = "9",
    day = "1",
    doi = "10.1016/j.oceaneng.2012.05.018",
    language = "English",
    volume = "51",
    pages = "85--93",
    journal = "Ocean Engineering",
    issn = "0029-8018",
    publisher = "Elsevier BV",
    number = "null",

    }

    Time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed propeller. / Lam, W.H.; Robinson, Desmond J.; Hamill, Gerard A.; Zhao, J.F.; Jia, M.

    In: Ocean Engineering, Vol. 51, No. null, 01.09.2012, p. 85-93.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed propeller

    AU - Lam, W.H.

    AU - Robinson, Desmond J.

    AU - Hamill, Gerard A.

    AU - Zhao, J.F.

    AU - Jia, M.

    PY - 2012/9/1

    Y1 - 2012/9/1

    N2 - The current study investigated the time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed ship propeller. The six-bladed propeller provided the rapid periodical pulses of thrust in one revolution due to the blades leading to a complex downstream jet. The six-bladed propeller is popular as a boat racing propeller, but the presentation of its flow structure was rarely found in the previous studies. In this study, the experiments were carried out in a water tank to measure the time-averaged velocity and turbulence intensity by using a Laser Doppler Anemometry (LDA) system. The jet was produced by rotating the propeller at a constant speed powered by an electric motor. The maximum tangential and radial velocities of the six-bladed propeller were of 76% and 17% of the maximum axial velocity respectively. The study found that the six-bladed propeller has a lower tangential velocity, but a higher radial velocity with its own diffusing mechanism when comparing to the three-bladed propeller.

    AB - The current study investigated the time-averaged velocity and turbulence intensity at the initial downstream flow from a six-bladed ship propeller. The six-bladed propeller provided the rapid periodical pulses of thrust in one revolution due to the blades leading to a complex downstream jet. The six-bladed propeller is popular as a boat racing propeller, but the presentation of its flow structure was rarely found in the previous studies. In this study, the experiments were carried out in a water tank to measure the time-averaged velocity and turbulence intensity by using a Laser Doppler Anemometry (LDA) system. The jet was produced by rotating the propeller at a constant speed powered by an electric motor. The maximum tangential and radial velocities of the six-bladed propeller were of 76% and 17% of the maximum axial velocity respectively. The study found that the six-bladed propeller has a lower tangential velocity, but a higher radial velocity with its own diffusing mechanism when comparing to the three-bladed propeller.

    U2 - 10.1016/j.oceaneng.2012.05.018

    DO - 10.1016/j.oceaneng.2012.05.018

    M3 - Article

    VL - 51

    SP - 85

    EP - 93

    JO - Ocean Engineering

    JF - Ocean Engineering

    SN - 0029-8018

    IS - null

    ER -