Abstract
A numerical variational procedure is described for the design of a non-axisymmetric stator. The auxiliary function is constructed with the vortex lattice lifting line representations of propeller and stator, so that optimum circulation distribution can be determined on each individual blade of the non-axisymmetric stator as well as on the propeller. The number and locations of stator blades could be varied and decided by inspecting the individual blade loading, suited to the characteristics of the ship wake field in the example design for a large container vessel. The design has been validated through force measurements for the propeller, stator and rudder in cavitation tunnel experiments. Comparative estimations for the delivered powers are presented and an emphasis is put on the inclusion of rudder force in the final efficiency assessment. In an additional experiment, induced drag reduction was achieved with the attachment of winglets to the stator blades.
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