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This paper presents an experimental study on the effects of tapered hub on the propulsive characteristics of puller and pusher podded propulsors in straight course and static azimuthing conditions while operating in open water. The propulsive performance of two model pod units having the same pod-strut shape and propeller blade geometry with different hub shapes were measured using a custom designed pod dynamometer. The dynamometer system consisted of a six-component global dynamometer and a three-component pod dynamometer. The measurements consisted of the forces and moments of the units in the three co-ordinate directions and thrust and torque of the propellers for a range of advance coefficients from 0 to 1.2 combined with the range of static azimuthing angles from +30° to -30° in 15° increments in pusher and puller configurations. The variations in the propulsive performance due to the change in hub geometry in straight ahead conditions were examined first, followed by a study on the effects in different static azimuthing angles. Comparison of the results of the two pod units illustrated that in both pusher and puller configurations, the effect of hub taper angle is more significant at lower advance coefficients while the effects increased with increasing azimuthing angle. ©2009: The Royal Institution of Naval Architects.
Author(s): Islam MF, Veitch DB, Liu P, Akinturk A
Publication type: Article
Publication status: Published
Journal: Transactions of the Royal Institution of Naval Architects Part A: International Journal of Maritime Engineering
Year: 2009
Volume: 151
Issue: 1
Pages: 19-34
ISSN (print): 1479-8751
ISSN (electronic): 1740-0716
Publisher: Royal Institution of Naval Architects
URL: https://doi.org/10.3940/rina.ijme.2009.a1.132
DOI: 10.3940/rina.ijme.2009.a1.132
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