A DESIGN METHOD FOR DUCTED PROPELLERS BY COUPLING RANS SOLVER WITH LIFTING-SURFACE METHOD

摘要

Considering the interaction among ship hull, appendages, duct and propeller, to get accurate inflow condition or effective wake on the propeller inside the duct is still a challenge to ducted propeller design or analysis. The viscosity should play a significant role in the interaction especially with propeller running inside a duct. This paper presents a ducted propeller design method and process, coupling RANS method and lifting surface design method to get effective wake and to design ducted propeller. It takes ship hull, appendages, duct and propeller as an integrated system of bodies and RANS code is employed to predict the total effective flow to the propeller inside the duct. The hydrodynamic performance is verified with RANS method, where the designed detail geometry of the propeller is input. The method is finally validated by experiment and shows a satisfactory result.