高荷重プロペラを装備した高速船の性能向上に関する研究

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This report first describes the review results on the hydrodynamic issues on high-speed and high-powered ships and the research results for developing ship hulls and optimum propellers to concretely solve some serious hydrodynamic problems on a high-speed and high-powered ship with a large diameter single screw propeller. The discussion was made based on the research results of three-year project on "Research on Improvement of Propulsive Performance of a High-Speed Ship Equipped with a High-Powered Propeller" and the related investigation on high-speed and high-powered ships. This project was also performed with linking to the review activities for 24th ITTC Propulsion Committee and the cooperative works between NMRI and other organizations. The first part of the present report reviews the recent research activities for identifying the hydrodynamics issues on propulsion systems of high-powered and high-speed ships, especially large container ships. The feasibility study reports written by the shipbuilders and researchers suggested a large container ship with the large capacity more than 10,OOOTEU as a future ship, including the report by the 23rd ITTC propulsion committee. In addition this report conducts data analysis on the principal dimensions and the difficulty index based on the NMRI data and the data from the abovementioned feasibility studies on a large container ship. The cavitation erosion and pressure fluctuations and bearing forces are identified to be the most serious hydrodynamic issues. The second part of this report describes the improvement on the ship hulls and propellers of a high-speed and high-powered ship, such as for a large container ship. The CFD calculations on this type of ship were carried out to confirm its usefulness. For the present ship hull form, some difficulties were found in the grid generation near the bow and the stern to obtain reasonable solutions on the resistance and ship wake distribution. Several ship hull forms were designed not only to reduce the wave and viscous resistance but also to make the ship wake as uniform as possible. The stern shape modification for the wake uniformity causes the reduction of propulsive efficiency, while the reduction of wake deficit greatly reduces the pressure fluctuation amplitudes to comfortable level and erosive cavitation for the finally designed large container ship. This report discusses the usefulness of design tools and the design results for several kinds of container ship hulls with several designed propellers through the experiments in the 400m-towing tank and the large cavitation tunnel in the NMRI. Several propellers were designed by the respective optimum propeller design methods to reduce cavitation and the pressure fluctuations induced by cavitating propellers. Most of the designed propellers go over the design target on the propeller efficiency, pressure fluctuations and erosion.
2008-06-25

高荷重プロペラを装備した高速船の性能向上に関する研究

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