Abstract
A low-order panel method is used to predict the performance of ducted propellers. A full wake alignment (FWA) scheme, originally developed to determine the location of the force-free trailing wake of open propellers, is improved and extended to determine the location of the force-free trailing wakes of both the propeller blades and the duct, including the interaction with each other. The present method is applied on a ducted propeller with sharp trailing edge duct, and the predicted results over a wide range of advance ratios, with or without full alignment of the duct wake, are compared with each other, as well as with results from RANS simulations and with measurements from an experiment.
Highlights
As a viable propulsion system, ducted propellers, which involve rotating blades inside a non-rotating nozzle, have been used widely in shipbuilding and offshore industries and beyond.Ducted propellers can provide more total thrust with higher efficiency than open propellers, especially at low advance ratios
Duct and the experiment at full wake alignment (FWA) is applied to a square-tip ducted propeller to investigate the effects of the blade/duct wake on the predicted propeller performance
To address the interaction scheme has been applied on ducted propeller with a square tip blade and a sharp trailing edge duct
Summary
Ducted propellers can provide more total thrust (due to blades and duct) with higher efficiency than open propellers, especially at low advance ratios. They protect the propeller blades, even though they increase the risk of cavitation (in the case of accelerating ducts). Accurate prediction of open or ducted propeller performance at on- and off-design conditions is very important. Due to the relatively long computation time and the often considerable effort to generate a proper grid, especially in the case of ducted propellers, RANS becomes a less viable tool in the early design stage. The boundary element method (BEM, or panel method) is a viable alternative numerical tool to RANS. BEM solves for the unknown perturbation potential on the boundary of the domain
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