A sculling propeller consists of one or two wings mounted vertically behind the ship. The wings move sideways back and forth, while their angles of incidence are adjusted such that water is pushed in the backward direction. The optimum efficiency of the sculling propeller is determined within the framework of a linear three-dimensional potential-flow theory. The optimum vorticity shedded by the wings is calculated, and this determines the efficiency of the propeller. Optimum angles of incidence of the wings are calculated by use of a semi-linear two-dimensional potential-flow theory. The span of the propeller wings is assumed to be infinite. Furthermore the wings are assumed to have zero thickness. Then the influence of the finite span of the propeller wings on the efficiency is investigated by means of a linear three dimensional potential-flow theory. The wings' motion is almost the same as that derived from the two-dimensional optimization theory however, with a slight modification in order to allow for the effect of finite span. Finally the influence of the viscosity of the water on the efficiency is investigated.
Optimum Sculling Propulsion of Ships
1987
146 pages
Report
Keine Angabe
Englisch
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