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.

  • Corporate Authors:

    Society of Naval Architects of Japan

    23 Shiba-kotohiracho, Minato-ku
    Tokyo 135,   Japan 
  • Authors:
    • Kumai, T
    • Okabe, J
    • Tasai, F
    • Taneda, S
    • Takematsu, M
    • Narasako, Y
    • Yonemori, T
    • Karimata, T
  • Publication Date: 1971

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00035104
  • Record Type: Publication
  • Source Agency: Society of Naval Architects of Japan
  • Files: TRIS
  • Created Date: Oct 27 1973 12:00AM