Prediction of the Open-Water Performance of Ducted Propellers With a Panel Method
Author Baltazar, J., Rijpkema, D.R., Falc√£o de Campos, J.A.C. and Bosschers, J.
Title Prediction of the Open-Water Performance of Ducted Propellers With a Panel Method
Conference/Journal Fifth International Symposium on Marine Propulsors (SMP), Espoo, Finland
Paper no. 1188
Month June
Year 2017

Abstract
In the present work, a comparison between the results obtained by a panel code with a RANS code is made to obtain a better insight on the viscous effects of the ducted propeller and on the limitations of the inviscid flow model, especially near bollard pull conditions or low advance ratios, which are important in the design stage. The analysis is carried out for propeller Ka4-70 operating inside duct 19A. From the comparison, several modelling aspects are studied for improvement of the inviscid (potential) flow solution. Finally, the experimental open-water data is compared with the panel method and RANS solutions. A strong influence of the blade wake pitch, especially near the blade tip, on the ducted propeller force predictions is seen. A reduction of the pitch of the gap strip is proposed for improvement of the performance prediction at low advance ratios.

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