A series of questions are raised about ship propulsion in the context of hydrodynamics and the limits of their use. A new spacial picture of propeller flow was developed and checked. The subpressure induced by the propeller was recognized as an important prerequisite for the actual water transport action of the propeller. When the speed induced by the subpressure is taken into account, a new definition of propeller effectiveness is generated which combines the induced output and the transport output. The new efficiency is greater than the former one; the degree of influence of the ship is much less than before when the propeller-induced speeds with the newly defined wake are taken into account. An evaluation of these circumstances suggests new priorities in ship construction which are tested in this study with the use of models. The new definition of efficiency accents the logical difference between the nominal and the actual wake by considering the influence of ship and propeller on each other. The new efficiency definition makes a differentiated measurement of the influence of changes in ship form possible and promotes propeller evaluation even with small and entirely vanishing degrees of forward peripheral speed.


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    Titel :

    A New Definition of Reference Magnitude in the Measurement of the Propulsion Ratios of Ships According to Experiments with Models (Eine Neudefinition der Bezugsgroessen zur Beurteilung der Propulsionsverhaeltnisse von Schiffen nach Modellversuchen)


    Beteiligte:
    L. Nitzki (Autor:in)

    Erscheinungsdatum :

    1980


    Format / Umfang :

    180 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch