The experimental verification of an optimization theory for sculling propulsion is described. The optimization theory models the hydrodynamics of a specific class of sculling propellers. The propeller consists of one wing or two wings moving side by side or one behind the other. An optimum motion to generate a certain prescribed mean thrust with the highest possible hydrodynamic efficiency can be calculated with this model. The optimum motion consists of a periodic sideways motion of the wing superimposed by a periodic pitching motion. The forces and the moment as a function of time for the two dimensional wing(s) can be calculated as well. The theoretical model reached a stage where a comparison with measurements was necessary. The verification of the theory is divided into three parts, namely: an introduction to the theory of sculling propulsion; an evaluation of the methods and assumptions used; a comparison of theoretical and measured results. A prototype designed for measurements was tested in towing tank, showing that the theory yields equivalent results for the mean thrust in several cases tested.
Verification of a Theory for Sculling Propulsion
1992
113 pages
Report
Keine Angabe
Englisch
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