Unsteady hydromechanics of a steering podded propeller unit |
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| Authors: | Pengfei Liu Mohammed Islam Brian Veitch |
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| Institution: | 1. National Research Council Canada, Institute for Ocean Technology, 1 Kerwin Place and Arctic Avenue, St. John''s, NL, Canada A1B 3T5;2. Oceanic Consulting Corporation, 95 Bonaventure Avenue, St. John''s, NL, Canada A1B 2X5;3. Faculty of Engineering & Applied Sciences, Memorial University of Newfoundland, St. John''s, NL, Canada A1B 3X5 |
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| Abstract: | Unsteady forces, torques and bending moments were predicted for a model podded propulsor unit at various azimuth angles. Predictions in time history include propeller shaft thrust, propulsor unit thrust, normal forces to the propeller shaft bearing, total forces acting on the propulsor unit, propeller shaft torque, blade spindle torque, in-plane and out-of-plane bending moments, and propulsor unit stock shaft torque and bending moments. Analysis was performed for averaged forces and their fluctuations as well. A time-domain unsteady multi-body panel method code, PROPELLA, was further developed for this prediction work. Predictions were compared with a set of time averaged in-house experimental data for a puller-type podded propulsor configuration in the first quadrant operation. Unsteady fluctuations of forces were predicted numerically. Analysis was made for the bending moment on propeller blades, shaft and the propulsor unit stock shaft for azimuth angles from 0° to 45°. It indicates that the magnitude and fluctuation of the forces are significant and they are essential for structural strength and design optimization. The predicted bending moment and global forces on the propulsor unit provide some useful data for ship maneuvering motion and simulation in off-design conditions. |
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