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A proposal for propulsion performance prediction of a single-propeller twin-rudder ship |
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| Authors: | Vishwanath Nagarajan Dong-Hoon Kang Kazuhiko Hasegawa Kenjiro Nabeshima Toshihiko Arii |
| Affiliation: | (1) Department of Naval Architecture and Ocean Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita 565-0871, Japan;(2) 100 C. Maxwell Stanley Hydraulics Laboratory, IIHR-Hydroscience and Engineering, College of Engineering, The University of Iowa, Iowa City, IA 52242-1585, USA;(3) Japan Hamworthy Co., Ltd, Omodaka Building, 1-15-1 Shigino-nishi, Joto-ku, Osaka 536-0014, Japan |
| Abstract: | The influence of a rudder’s axial force on the prediction of full-scale powering performance of a ship is investigated in this paper. Axial force characteristics of different rudder types were investigated by open water experiments. Viscous scale effects on the rudder’s axial force were investigated by carrying out open water experiments with different sizes of rudder. Experiments were carried out in the towing tank for a model ship fitted with different rudder systems to investigate the influence of rudder’s axial force on full-scale propulsion performance prediction. Based on the experiment results, a new prediction method is proposed for estimating full-scale power that considers scale effect on rudder’s axial force. Good performance of the proposed prediction method is demonstrated by estimating the engine power of a ship installed with a special high lift twin-rudder system from model experiments and comparing it with the values measured on the ship during full-scale experiments. |
| Keywords: | Single-propeller twin-rudder system Rudder axial force Viscous scale effects |
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