The JAFO-Technologie Hamburg and the Potsdam Model Basin (SVA) developed and investigated a propulsor for fast shallow-draught ships, unconventional ships especially SES, submarines and marine ships. The propulsor is called LINEAR-Jet. It works like a water jet. A rotor and a stator are ducted by a nozzle. The upstream and downstream pipes are cut off and the propulsor stands in the wake like a ducted propeller. The propulsion system LINEAR-Jet has a couple of advantages especially for fast and flat going ships. The velocity in the area of the rotor is less than the velocity at the trailing edge of the nozzle. The inception of cavitation moves to higher advance coefficients. The cavitation behaviour was investigated in oblique flow in a range up to 5 degrees. The cavitation behaviour was nearly independent from the oblique flow. Propulsion tests have shown a reduction of the required power of 2.1 % for a patrol boat at a ship speed of VS = 21.6 kn. The thrust loading coefficient of a LINEAR-Jet can be up to ten times higher than the thrust loading coefficient of a ducted propeller, without cavitation problems. For that reason it is possible to reduce the diameter, compared with a free running propeller or reduce the propeller induced noise by reduction of the number of revolutions. The stream of the propulsor is nearly spin free. If the LINEA-Jet is powered by a Z-drive, the shaft is covered by a blade of the stator. For shaft-powered LINEAR-Jets working with a rudder, the danger of rudder cavitation is low because the stream is nearly spin free. For these reasons the LINEAR-Jet is an attractive alternative for fast ships; especially with a design speed between VS = 20 and 30 kn and for ships with a high thrust loading coefficient.


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    Title :

    LINEAR-Jet: a propulsion system for fast ships


    Additional title:

    LINEAR-Jet: Ein Vortriebssystem für schnelle Schiffe


    Contributors:
    Bohm, M. (author) / Jürgens, D. (author)


    Publication date :

    1998


    Size :

    9 Seiten, 10 Bilder, 6 Tabellen, 10 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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