| Project/Area Number |
59850075
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| Research Category |
Grant-in-Aid for Developmental Scientific Research
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| Allocation Type | Single-year Grants |
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| Research Field |
船舶抵抗・運動性能・計画
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| Research Institution | OSAKA UNIVERSITY |
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Principal Investigator |
TANAKA Ichiro Osaka University, 工学部, 教授 (30028964)
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| Co-Investigator(Kenkyū-buntansha) |
TODA Yasuyuki Osaka University, 工学部, 助手 (20172166)
AMAGAI Kiyoshi Hokkaido University, 水産学部, 講師 (50001623)
NAKATO Michio Hiroshima University, 工学部, 教授 (20034324)
MARUO Hajime Yokohama National University, 工学部, 教授 (30017842)
MATSUMURA Kiyoshige Osaka University, 工学部, 助手 (10135668)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥17,700,000 (Direct Cost: ¥17,700,000)
Fiscal Year 1986: ¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 1985: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1984: ¥7,800,000 (Direct Cost: ¥7,800,000)
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| Keywords | aditional apparatus / UKS form / thick boundary layer / stern flow field with longitudinal vortices / propeller with fixed blades / vortex generators / タンデムプロペラ / 渦発生フィン / 有効伴流分布 / 高推進効率船 / 推進効率 / 起振力の軽減 / 推力減少率 |
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| Research Abstract |
The research items planned to perform the theoretical and experimental studies are as follows:
(1) To develop a new ship form of large wake gain utilizing the Under Keel Stern (UKS) form concept. (2) To investigate the effectiveness of the propeller with fixed blades, etc. (3) To study the possibility of improving propulsive efficiency by placing vortex generators ahead of propeller. (4) To investigate the possibility of improving propulsive efficiency by giving proper variations to frame line shape. (5) By investigating the methods of calculation of frictional resistance with consideration of the chages in frame line shape, the relationship between the frictional resistance and the frame lines is clarified. (6) It is found that the tandem propeller is very effective in decreasing vibration exciting force. (7) As a result of investigation of flow field induced by vortex generators, a possibility to control the flow field by them is found, yielding high propulsive efficiency. (8) A new method is proposed to predict the effective wake distribution from the nominal one. This is one of the essential prerequisite matters to develop a ship form with additional apparatus of high propulsive efficiency.
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