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Investigation of the supression of turbulent vortex formation and the frictional drag reduction effect on ship hull due to hydrogel painting

水凝胶涂装抑制湍流涡形成及船体减摩减阻效果研究

基本信息

批准号：
24760675
负责人：
TAKAGI Youhei
金额：
$ 2.83万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Young Scientists (B)
财政年份：
2012
资助国家：
日本
起止时间：
2012-04-01 至 2014-03-31
项目状态：
已结题

项目摘要

Hydrogel painting for ship hull makes hydration layer in sea water and has various functionalities. In this study, we revealed the effect of frictional drag reduction with hydrogel painting surface based on the relation with turbulent vortical structure formation. In experiment, we made a rotating annular cylinders apparatus with painted surface on the inner cylinder, and measured the torque acted on the inner cylinder. From experimental data, it was shown that the drag reduction effect of hydrogel painting became strong when the thickness of painting layer became small. In addition, we carried out the numerical simulations of channel flow with local slip velocity and penetration of fluid into wall, and found that the drag reduction effect depended on the scale of turbulent vortex structure and the thickness of boundary layer.

船体水凝胶涂料在海水中形成水化层，具有多种功能。在这项研究中，我们基于与湍流涡旋结构形成的关系揭示了水凝胶涂层表面的摩擦阻力减少效果。实验中，我们制作了一个内筒表面涂有油漆的旋转环形筒装置，并测量了作用于内筒上的扭矩。实验数据表明，水凝胶涂料的减阻效果随着涂料层厚度的减小而增强。此外，我们对具有局部滑移速度和流体对壁面渗透的通道流进行了数值模拟，发现减阻效果取决于湍流涡结构的规模和边界层的厚度。