5. Measurements of Boundary Layers of Ships (I)

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概要

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• In Research Institute for Applied Mechanics, Kyushu University, a research group was organized, supported by the Grant-in-Aid for the Special Scientific Research from Ministry of Education over the three-year period from 1966 through 1968, in order to conduct a series of experimental investigations entitled "Measurements of Boundary Layers of Ships," of which the following is the first report. Because of the very limited term to be devoted to this research project, the scope of the present study had to be confined to a rather small field connected directly with developments of the technique and the equipment suitable for measurements of boundary layers of full-scale ships, although of course the purpose of this research as a whole should lie ultimately in contributing to the progress of naval hydrodynamics by furnishing it with those fundamental data in relation to characteristics of boundary layers formed on ship hulls, which might be collected only by measuring various quantities significant in boundary layer research for a great number of ship forms as well as of navigation conditions. The boundary layer measurements were confined to (1) the velocity profile, (2) the intensity of turbulence, and (3) the visualization of wake vortices. The Wakasugi, a wooden launch, gross tonnage 9.5 tons, and the Nansei Maru, a wooden vessel, gross tonnage 44.56 tons, were employed for the measurements. A sucking-disk was equipped with a set of pressure tubes or that of hot-wire probes. Sucking-disks were attached to the hull by skin divers trained especially for these experiments. The wake visualization was performed by observing the motion of colored water ejected into the ship wake. All the experiments were made successfully. However, conclusions derived out of them are merely tentative and should be re-examined through similar measurements to be carried out in future.

• 社団法人日本船舶海洋工学会の論文

著者

• Kumai Toyoji

  Research Institute For Applied Mechanics Kyu Shu University

• Takematsu Masaki

  Research Institute For Applied Mechanics Kyu Shu University

• OKABE Junichi

  Research Institute for Applied Mechanics, Kyu shu University

• TASAI Fukuzo

  Research Institute for Applied Mechanics, Kyu shu University

• TANEDA Sadatoshi

  Research Institute for Applied Mechanics, Kyu shu University

• NARASAKO Yoshikazu

  Faculty of Fisheries, Kagoshima University

• YONEMORI Tooru

  Faculty of Fisheries, Kagoshima University

• KARIMATA Tadao

  Faculty of Fisheries, Kagoshima University

• Okabe Junichi

  Research Institute For Applied Mechanics Kyu Shu University

• Karimata Tadao

  Faculty Of Fisheries Kagoshima University

• Yonemori Tooru

  Faculty Of Fisheries Kagoshima University

• Narasako Yoshikazu

  Faculty Of Fisheries Kagoshima University

• Tasai Fukuzo

  Research Institute For Applied Mechanics Kyu Shu University

• Taneda Sadatoshi

  Research Institute For Applied Mechanics Kyu Shu University

関連論文

• Observations of Eddies in the Japan Basin Interior
• Direct Measurements of Deep Currents in the Northern Japan Sea
• Basin-to-basin and Year-to-year Variation of Temperature and Salinity Characteristics in the East Sea (Sea of Japan)
• Vortex Shedding from 'Taylor Columns'
• 5. Measurements of Boundary Layers of Ships (I)
• On the Estimation of Natural Frequencies of Vertical Vibration of Ships
• Unsteady Flow past a Flat Plate Normal to the Direction of Motion
• The Behaviour of Tracer Particles in Flow Visualization by Electrolysis of Water
• Visual Observations of the Flow past a Circular Cylinder Performing a Rotatory Oscillation
• Unsteady Flow past a Circular Cylinder
• Formation of Streamwise Vortices in the Flow past a Corner
• Visualization of the Unsteady Flow past Cylinders and Plates Decelerated from Steady Speed
• The Development of the Lift of an Impulsively Started Elliptic Cylinder at Incidence
• Amplification of Artificial Disturbances in Turbulent Boundary Layers
• Necklace Vortices
• Experimental Investigation of Vortex Streets
• Visualization of Separating Stokes Flows
• 1. On the Three-Dimensional Correction Factor for the Virtual Inertia Coefficient in the Vertical Vibration of Ships (J-value of an elliptical cylinder)
• Visualization of Steady Flows Induced by a Circular Cylinder Performing a Rotatory Oscillation about an Eccentric Axis
• An Experiment on the Flow around a Waving Plate
• The Main Structure of Turbulent Boundary Layers
• Waving Motions of Flags

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