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ISSN オンライン: 2642-0554

REDUCTIONS OF PRESSURE-DRAG-INCREASE AND FRICTION-DRAG DUE TO TURBULENT WATER FLOW OVER A SLIGHTLY SLIPPERY WAVY SURFACE

Ryosuke Yamasaki
Department of Mechanical and System Engineering Kyoto Institute of Technology Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

Keisuke Maeda
Department of Mechanical and System Engineering Kyoto Institute of Technology Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

Atsuhide Kitagawa
Department of Mechanical and System Engineering Kyoto Institute of Technology Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

Yoshimichi Hagiwara
Department of Mechanical and System Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology Goshokaido-cho, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

要約

We have carried out velocity measurement for turbulent water flow over a slip-coat silicone rubber plate in an open channel at a high Reynolds number. This silicone rubber plate is a model of deformed skin of swimming dolphins. The friction drag acting on the plate has been estimated from the velocity profile. The total drag acting on the plate has been measured from the strain of thin metal strips supporting the plate. The experimental result shows 6.6 % reduction of total drag when compared with a conventional silicone rubber plate. We have also carried out an experiment using a hydrophilized polycarbonate wavy plate and have obtained 8.8 % reduction of friction drag compared with the slip-coat plate.