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
    Likes: 0, Points: 0, Legacy Rep: 10
    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
     
  2. Olav
    Joined: Dec 2003
    Posts: 321
    Likes: 46, Points: 38, Legacy Rep: 460
    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...
     
  3. martuk
    Joined: Dec 2008
    Posts: 2
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: istanbul

    martuk New Member

    thanks
     
  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
     

  5. quyetvtt46
    Joined: Dec 2008
    Posts: 16
    Likes: 0, Points: 0, Legacy Rep: 10
    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
     
Loading...
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.