Efficient propeller Designs based on Full scale CFD simulations

(By N.W.H. Bulten, P.W. Stoltenkamp, J.J.A Van Hooijdonk // Wärtsilä Propulsion, R&D-Hydrodynamics, Lipsstraat 52, 5151 RP Drunen, The Netherlands )

In order to be able to further enhance the performance of ship propellers, the possibilities of full scale numerical flow simulations have been investigated. The aim is to get a full understanding of the occurring flow phenomena on the actual ship. With this knowledge the optimum propeller design can be made. During the validation process a critical review of the model scale measurements methods has been made. The validity of some of the commonly used procedures has been evaluated. The use of full scale CFD simulations provide direct full scale data on the hull wake field and the propeller performance. It has been shown that the commonly used extrapolation methods predict different answers. Decomposition of the forces acting on the hull, the propeller and the rudder is being used to get a proper insight in the flow field at full scale. In the end the design features which contribute to efficiency increase, and thus fuel consumption reduction, can be isolated, based on the results from detailed flow simulations.

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http://cdn.wartsila.com/docs/default-source/product-files/gears-propulsors/propellers/white-paper-o-p-2014-efficient-propeller2287854a7f0f601bb10cff00002d2314.pdf?sfvrsn=4