proximate diameter of a single screw 92 meter container

Discussion in 'Propulsion' started by martuk, Dec 19, 2008.

  1. martuk
    Joined: Dec 2008
    Posts: 2
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    Location: istanbul

    martuk New Member

    hi
    as a project a have to design a propeller (b series ) for a single screw 92 meter container ship.
    i have required formulas acoording to formulas i need a starting diameter and rotaional speed N
    i assumed some values but i think they are totaly wrong i have no idea about how to find proximate values
     
    martuk, Dec 19, 2008
    #1
  2. Olav
    Joined: Dec 2003
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    Location: Filia pulchra Lubecæ

    Olav naval architect

    Martuk,

    this is quite easy: Just take the distance between the lower surface of the afterbody and the baseline (i.e. the largest diameter possible) at the propeller position and subtract 0.10 m from this to ensure proper tip clearance.

    Rules of thumb:

    Dprop, max ≈ 0.68 * T and
    Dprop, min ≈ √(Pinst / 500kW)

    Rotational speed should then be determined from thrust coefficient KT = T / (ρ * n² * D^4) at maximum efficiency from the propeller diagram.

    Hope this helps...
     
    Olav, Dec 21, 2008
    #2
  3. martuk
    Joined: Dec 2008
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    Location: istanbul

    martuk New Member

    thanks
     
    martuk, Dec 21, 2008
    #3
  4. apex1

    apex1 Guest

    Hello Martuk.
    I am actually in Istanbul and have some time to assist you if needed:rolleyes:
    Just send PM to make appointment.
    Regards
    Richard
     
    apex1, Dec 21, 2008
    #4

  6. quyetvtt46
    Joined: Dec 2008
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    Location: shipdesign

    quyetvtt46 Junior Member

    you can determine diameter D according to fomular : (n)^(1/2)*D=11,8(T)^(1/4) or (n)^(1/2)*D=13*(Ps/vs)^(1/4)
    n: revolution of propeller
    D: diameter of propeller
    T: thrust of propeller
    vs: velocity of vessel
    Ps : bracket power of main machine
     
    quyetvtt46, Dec 24, 2008
    #5
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