Ducted propellers are usually used in many kinds of vessels, i.e., fishing vessels, trawlers, and submarines which have provided high efficiency in propulsion system. In this article, the effects of the length and angle of 19A type duct on the hydrodynamic performance were investigated. First, the ducted propeller (19A type duct) was selected for the study and modeling of this duct was later developed. Then, ducted propeller performance was analyzed by a RANS turbulence model of SST-K-ω and validated with the experimental results which indicated an acceptable accuracy. Finally, the effects of the implemented changes were analyzed considering the alternation of the angle of the duct and the duct size at a rate of 10 and 20 percent of the original length. In this regard, Numerical results included pressure distribution, hydrodynamic characteristics and velocity behind the propeller of various geometries and physical conditions. The effects of the duct angle and propeller location were presented and discussed, as well.

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