2022 Fiscal Year Final Research Report
Study of new type energy saving rudder for high performance
| Project/Area Number |
20K04941
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 24020:Marine engineering-related
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| Research Institution | Kyushu University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | プロペラ-舵干渉 / 省エネ舵 / フィン付舵 / プロペラ後流 / 舵推力 / 舵抗力 |
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| Outline of Final Research Achievements |
In this study, we take rudders with fin which efficiently recovers the energy loss due to the circumferential flow generated by the propeller and improves the propulsive performance. The theoretical fundamental study, model test using the circulating water channel, and development of a newly-type rudder fin are conducted.
Typical rudder fins are practical and widely used as energy saving devices. In this study, the effect of the rudder fin is investigated in detail based on fluid dynamics and wing theory. As a result, it is found that elliptic fins obtain the larger thrust which reduces the rudder drag. Also, it is shown that the propeller-rudder propulsive efficiency considering the change of propeller thrust is improved by theoretical calculation, CFD, and the model test.
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| Free Research Field |
船舶海洋流体工学
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| Academic Significance and Societal Importance of the Research Achievements |
プロペラ-舵の干渉を利用した様々な省エネデバイスが実用化されている。一方，これらに関する研究は，船体を含めた自航要素の評価で行われるものが殆どである。実用の設計上，自航要素の評価は重要であり，当然着目すべきである。しかし，複雑な現象の流体力学的な干渉を詳細に知るには，より基本的な検討が望ましい。本研究ではプロペラと舵のみの干渉に着目し，フィン付舵の効果について詳細を調べ，フィンと舵本体の推力にはある程度トレードオフの関係があること，フィンは壁（舵面）に付加されているにもかかわらず鏡像効果を有しない等，これまでに着目されなかった流体力学的見地からの考察を示しており，学術的意義が大きいと考える。
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