Study of Puller Podded Propulsors with Tapered Hub Propellers in Straight Course and Azimuthing Conditions

M. Islam, B. Veitch, N. Bose, Pengfei Liu
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Abstract

This paper presents the results of an experimental study on the effects of propeller hub angle and azimuth conditions on the propulsive characteristics of puller podded propulsors in open water conditions. The propulsive performance of two model puller-podded units with different propeller hub geometry was measured using a custom-designed pod dynamometer in a towing tank. The podded units were tested to measure the thrust and torque of the propeller and the forces on the whole unit in three orthogonal directions. The tests were conducted for a range of advance coefficients from 0 to 1.2, combined with the range of static azimuth angles from +20° to -20° with a 10° increment. The dynamometer system consisted of a six-component global dynamometer and a three-component pod dynamometer. The variation in the propulsive pe1formance due to the changes in hub geometry was examined first, followed by a study on the effect of azimuth conditions on the forces and moments on the propulsor. The force and moment measurements are presented as functions of advance coefficient and azimuth angle. The results showed that for the range of azimuth angles tested, the thrust and torque of the propeller and the forces on the whole unit in three orthogonal directions are functions of the azimuth angle for puller propulsors.
直航和方位条件下锥形轮毂拉臂吊舱螺旋桨的研究
本文介绍了在开放水域条件下,螺旋桨轮毂角和方位条件对拉杆吊舱式推进器推进特性影响的实验研究结果。采用特制的吊舱测功仪,在拖曳舱中测试了两种螺旋桨轮毂几何形状不同的拉杆吊舱推进器的推进性能。对吊舱单元进行了测试,测量了螺旋桨的推力和扭矩以及整个单元在三个正交方向上的受力。测试的超前系数范围为0到1.2,静态方位角范围为+20°到-20°,增量为10°。该测功机系统由六分量全局测功机和三分量吊舱测功机组成。首先研究了轮毂几何形状变化对推进性能的影响,然后研究了方位角条件对推进力和力矩的影响。力和力矩的测量以超前系数和方位角的函数表示。结果表明,在测试的方位角范围内,螺旋桨的推力和扭矩以及整个装置在三个正交方向上的力是拉桨推进器方位角的函数。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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