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.

在演讲研究中，讨论了作用在船上的流体耐药性的降低，这是基于主船体和附着的部分之间的流体动力相互作用，例如灯泡，机翼，尖峰或支架。通过在循环水通道中的牵引罐中的电阻测试和/或可视化方法在实验中对流体动力相互作用进行了研究，并根据兰金源方法或Morino面板方法（例如兰金源方法）的方法进行了数值方法。作为本研究的主要主题，讨论了以下研究工作。・优化弓鳞茎以最大程度地减少抗抗性[单救生] ・降低了偏中线灯泡（双鳞茎）[单救生器）降低波动阻力[单救生器]。 [多壳] ・在不包括最后一个的情况下，在弓前面附着的尖峰（单壳带有虚张声势的弓形）的尖峰降低了波动阻力，可以减少作用在高速弗洛德数字上的高速容器上的波动阻力。尤其是在第一种情况下，灯泡形状和船只的前体是通过兰金源方法和非线性编程优化的。在最后一个，可以通过尖峰改变波浪破裂现象，并通过实验研究其可用性以降低波浪破裂性。