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In this paper, a preliminary parameter characterization for the numerical optimization of ducted propellers was performed. The ENSTA Bretagne in-house solver used is based on the potential flow theory. Although the potential flow solver is able to solve unsteady problems, in this preliminary study, only steady state flow problems are considered. Different parameters are analyzed, such as the gap between the propeller tip and the inner duct surface, as well as the propeller location in the duct tube. The analyses are carried out on a standard advance coefficient range. A quick study shows that a neutral NACA profile for the duct section can provide higher performance predictions than the classical accelerating Kort nozzle 19A. The parameter study shows that the best axial position for the rotor is not necessarily near the duct entrance and, more importantly, that a thinner duct profile can give better hydrodynamic performance.

Preliminary parameter characterization for numerical optimization of ducted propellers