A hyperboloidal low order source-doublet steady/unsteady time domain panel method code PROPELLA was modified and used to evaluate effects of hub taper angle and pod-strut geometry on the open water propulsive performance of a fixed pitch screw propeller used in podded propulsion systems for pusher configurations.;Effects of hub taper angle on propulsive performance were studied numerically in terms of thrust coefficient, KT, torque coefficient, KQ, and propulsive efficiency, eta, for a wide range of advance coefficient, J, for different hub taper angles ranging from -25° to 25° in 5° intervals. Pressure distributions at the blade root section and the blade section at 0.75R were predicted and analyzed for propellers with three different hub taper angles (15°, 0°, -15°) to observe how hub taper angle effects sectional pressure distribution, resulting in variations in propulsive characteristics. (Abstract shortened by UMI.).;Effects of hub taper angle and pod-strut geometry on propulsive characteristics of podded propellers in pusher configurations have been investigated numerically. Validation of the modified code was done against measurements. Open water tests were done using three tapered hub propellers with taper angles of 15°, 20° and -15° in the towing tank at the Institute of Ocean Technology (IOT), National Research Council (NRC) and the resulting open water propulsive characteristics were then used to validate the modified code.
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