Study on the Performance of Optimum Draught Trim in Waves

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K15229
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 24020:Marine engineering-related
• Research Institution: National Institute of Maritime, Port and Aviation Technology
• Principal Investigator: FUKASAWA Ryouhei 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (80505107)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 水槽試験 / 波浪中 / 曳航水槽

Outline of Final Research Achievements

With the introduction of the fuel consumption performance reporting system starting in January 2019, there is a need to improve fuel efficiency during actual operation. In the field of propulsive performance, improvement of propulsive performance by energy　saving device is being studied. Among them, the improvement of propulsive performance by adopting the optimum trim according to the draft has not been studied much, and there is room for improvement.
In a previous study, we investigated the effect of changing the draft and trim on the horsepower of a large bulk carrier in flat water, and confirmed that a horsepower improvement of about 1% could be achieved by using the optimal trim. In the present study, as an extension of this study, the same model ship was tested in waves to investigate the performance in actual sea conditions with the optimum trim, and more advanced tank tests were investigated.

Free Research Field

水槽試験

Academic Significance and Societal Importance of the Research Achievements

バルクキャリア船のような肥大船は摩擦抵抗が支配的であり、最適トリムのようなプロペラ伴流利得による性能向上は影響が小さいため、定量的な評価が難しいと言えるが、本研究では変化についても差異として計測できており評価もできたと考えられる。平水中に比べ不確定要素の多い波浪中試験であっても的確な実験で可能であると確認した。本研究所において波浪中試験の水槽試験精度について高い技術を確認した。