Study on Scale Effect of the Resistance due to Stem Wave Breaking

干波破碎阻力尺度效应研究

• 批准号: 11650945
• 负责人: YAMANO Tadao
• 金额: $ 2.24万
• 依托单位: Hyogo University of Teacher Education
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650945/
• 关键词: Stem waves; Forward-oriented wave breaking; Remained following waves; Resistance; Scale effect; Flow velocity distribution at stem end; Boundary layer; Wave height; 波崩れ; 波崩れ抵抗; 船尾流れ; トランサム船尾; 波崩れ抵抗の尺度影響

(1) Clarification of the water flow structure just behind a transom stemThe detailed observation of water flow just behind a transom stem has clarified that reverse flow exists on water surface there and that the reversed flow is blocked out by the stem end and then flows along the stem end towards both sides and finally goes out into side flow. It has been also exprimentally confirmed that the reverse flow is generated as a result of forward-oriented wave breaking.(2) Development of methods to treat forward-oriented wave breakingWater flow just behind a transom stem has been approximated with trochoidal wave. Criteria for forward-oriented wave breaking occurrence have been proposed. Based on these, a method to estimate what thickness of flow layer under water surface breaks and an equation to estimate resistance due to forward-oriented wave breaking have been developed.(3) Clarification of forward-oriented wave breaking characteristicsStudies of the phenomenon by the methods developed in 2 have clarified that the phenomenon is much affected by the vertical flow speed distribution at stem end as assumed at the start of this study, it has, therefore, scale effect and non-dimensional coefficient of resistance due to the phenomenon decreases with increase of model ship size. On the other hand, it has been clarified that height of remained following waves, which is generated at stem end, not broken and propagated afterwards, increases with increase of model ship size to the contrary.(4) Study plan from nowRemained fallowing waves is to be studied at first. Next, scale effect of stem waves which consist of two components different in characteristics forward-oriented wave breaking and remained following waves is to be studied by the methods developed.

(1)通过对横尾后水流的详细观察，阐明了横尾后水面存在回流，回流被尾端阻挡，然后沿尾端向两侧沿着流，最后流出形成侧流。实验还证实了反向流是由于前向波浪破碎而产生的。(2)波浪前向破碎处理方法的发展用余摆线波来近似方尾杆后的水流。提出了前向波破碎发生的判据。在此基础上，提出了一种估算水面下流层破碎厚度的方法和一个估算波浪前向破碎阻力的公式。(3)用文献[2]中的方法研究了前向波的破碎特性，结果表明，前向波的破碎特性受船首垂向流速分布的影响很大，具有尺度效应，无量纲阻力系数随船模尺寸的增大而减小。另一方面，已经阐明，剩余的后续波的高度，这是在杆端产生的，而不是破碎和传播后，随着模型船的尺寸增加，相反。(4)今后的研究计划首先要研究剩余的休耕浪。其次，利用所开发的方法研究了由前向波破碎和残留的跟波两种特征不同的分量组成的干波的尺度效应。

项目成果

山野惟夫,日比野直樹,鞍谷文保: "On Scale Effect of the Resistance due to Wave Breaking just behind a Transom Strn"Proceedings of the 7^<th> International Marine Design Conference. 567-577 (2000)

Y. Yamano、Naoki Hibino、F. Kuratani：“On Scale Effect of the Resistance due to Wave Breaking just Behind a Transom Strn”第 7 届国际船舶设计会议论文集 567-577 (2000)。

山野惟夫,池淵哲朗,船野功: "On Forward-oriented Wave Breaking just behind a Transom Stern"日本造船学会論文集. 187号. 25-32 (2000)

Yoshio Yamano、Tetsuro Ikebuchi、Isao Funano：“关于横梁船尾后面的前向波浪破碎”日本造船学会论文集第 187. 25-32 (2000) 号。

山野惟夫,池淵哲朗,船野功: "On Forward-oriented Wave Breaking just behind a Transom Strn"日本造船学会論文集. 187号. 25-32 (2000)

Yoshio Yamano、Tetsuro Ikebuchi、Isao Funano：“论横梁后面的前向波浪破碎”日本造船学会论文集第 187. 25-32 (2000) 号。

山野惟夫,日比野直樹,鞍谷文保: "On Scale Effect of the Resistance due to Wave Breaking just behind a Transom Stern"Proceedings of the 7^<th> International Marine Design Conference. 567-577 (2000)

Y. Yamano、Naoki Hibino、F. Kuratani：“艉艉艉后方波浪破碎产生的阻力的规模效应”第 7 届国际船舶设计会议论文集 567-577 (2000)。

日比野直樹,鞍谷文保,山野惟夫: "ブラントな後端を持つ物体の直後の流れに関する研究-流れの特性について-"日本産業技術教育学会近畿支部第17回研究発表会講演論文集. 5-6 (2000)

日比野直树、仓谷文康、山野义夫：“对带有钝尾端的物体后立即流动的研究 - 关于流动的特性 -”日本工业技术教育学会近畿分会第 17 次研究报告会论文集5-6（2000）