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The science of podded propulsors is steadily advancing and some fundamental investigations are required to fill the research gaps caused by a lack of non-proprietary studies. Prior to this study, numerical investigations into the effects of the hub taper ratio and of pod geometry on the hydrodynamic performace of these propulsors had not been reported. A panel code was used to model the podded propulsor combinations and to investigate the effects of geometric variations of the pod and propeller hub on its hydrodynamic performance. In order to evaluate the effects of hub taper ratio, a plot for KT and KQ against J was prepared for different taper ratios varying from -25° to +25° in 5° intervals. The pressure distribution curves, Cp versus normalized chord length, were also plotted to investigate the effect of taper ratio on Cp at blade root section. Again in order to investigate the effect(s) of pod geometry on propeller performance, four plots for KT and KQ against J were prepared for the propeller and pod combination for taper angles of 15o and 20o both in push and pull configuration and then they were compared to similar plots without the pod geometry. A complementary experimental study of the effects of hub taper ratio on hydrodynamic performance has also been conducted. These tests consider the performance of four podded propulsors: 15° hub taper in push and pull configurations, and 20° hub taper in push and pull configurations. Pod and propeller geometry is consistent between both numerical and experimental investigations to allow for comparison of results and validation of the numerical code. |
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