Experimental study on hydrodynamics of L-type podded propulsor in straight-ahead motion and off-design conditions
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Experimental tests were conducted to evaluate the hydrodynamic performance of an L-type podded propulsor in straight-ahead motion and off-design conditions using an open-water measuring instrument developed by the authors for podded propulsors, a ship model towing tank, and under water particle image velocimetry (PIV) measurement systems. Under the three types of conditions, the main parameters of an L-type podded propulsor were measured, including the propeller thrust and torque, as well as the thrust, side force, and moment of the whole pod unit. In addition, the flow field on the section between the propeller and the strut was analyzed. Experimental results demonstrate that the dynamic azimuthing rate and direction and the turning direction affect the forces on the propeller and the whole pod unit. Forces are asymmetrically distributed between the left and right azimuthing directions because of the effect of propeller rotation. The findings of this study provide a foundation for further research on L-type podded propulsors.
KeywordsL-type podded propulsor off-design condition flow field particle image velocimetry propeller hydrodynamic experimental test
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This project was supported by the National Natural Science Foundation of China (Grant Nos. 41176074, 51379043 and 51409063) and was conducted in response to the great support received from a basic research project entitled “Multihull Ship Technology Key Laboratory of Fundamental Science for National Defence”, which was conducted at Harbin Engineering University. The authors would like to extend their sincere gratitude to their colleagues in the towing tank laboratory.
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