Reduction of Fluid Resistance Acting on Ships by Using Hydrodynamic

利用水动力减少作用在船舶上的流体阻力

• 批准号: 12450399
• 负责人: SUZUKI Kazuo
• 金额: $ 6.66万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12450399/
• 关键词: Hydrodynamic Interaction; Fluid Resistance; Shape Optimization; Drag Reduction; Hull Form Optimization; 船形最適化

In the present studies, reduction of fluid resistance acting on ships is discussed, which is based on hydrodynamic interactions between the main hull and attached parts like a bulb, a wing, a spike or an outrigger. Investigations on hydrodynamic interactions are carried out experimentally by resistance tests in a towing tank and/or visualization methods in a circulating water channel and numerically by panel methods based on potential theories like Rankine source method or Morino's panel method. As the main themes of the present studies, the following research works are discussed.・Optimization of bow bulb to minimize wave making resistance [Mono-hull]・Reduction of wave making resistance by off centerline bulbs (twin bulbs) [Mono-hull]・Reduction of wave making resistance by bulbs installed on center plane of catamaran [Catamaran]・Wave making characteristics of multi-hull vessels with outriggers or sponsons [Multi-hulls]・Reduction of wave breaking resistance by spike attached in front of bow [Mono-hull with bluff bow]In the cases excluding the last one, the wave making resistance acting on high speed vessels designed at high Froude numbers can be reduced. Especially, in the first case, the bulb shape and the fore body of ships are optimized by means of Rankine source method and the nonlinear programming. In the last one, the wave breaking phenomena can be changed by means of the spike and its availability to reduce the wave breaking resistance is investigated experimentally.

本文主要讨论了船舶减阻问题，主要是基于主船体与附属部件（如球壳、翼、尖钉或支腿）之间的水动力相互作用。水动力相互作用的调查进行了实验阻力试验在拖曳水池和/或可视化方法在循环水通道和数值面元法的基础上潜在的理论，如朗肯源方法或Morino的面元法。作为本研究的主题，讨论了以下研究工作。优化船首球头以减小兴波阻力[单体船]·通过偏离中心线的球头减小兴波阻力（双球头）[单体]·通过安装在双体船中心平面上的球头来减少兴波阻力[双体船]·带有外伸支架或舷侧突出物的多体船的兴波特性[多体]·通过安装在船头前面的尖状物来减少破波阻力[单体]具有海崖头的船体]在不包括最后一种情况的情况下，可以减小作用在以高佛汝德数设计的高速船上的兴波阻力。特别地，在第一种情况下，用朗肯源法和非线性规划法对球头船型和前体进行了优化。第三种方法是利用尖状物改变波浪破碎现象，并通过实验研究了尖状物对减小波浪破碎阻力的有效性。