実船における境界層の計測(II)

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A series of the experimental research entitled "Measurements of Boundary Layers of Ships" was performed in Research Institute for Applied Mechanics, Kyushu University, during the 1966-1968 academic years, supported by the Grant-in-Aid for the Special Scientific Research from Ministry of Education. The present paper is the second report of this investigation and is devoted to a full exposition of results of boundary layer measurements of the Kagoshima Maru (a steel vessel, gross tonnage 1,038.14), a fishing training ship belonging to Faculty of Fisheries, Kagoshima University, carried out in co-operation with that faculty in autumn 1968. The objects in view throughout these three years were consistently to find an experimental method which would enable us to measure characteristic quantities of a ship boundary layer without injuring the hull of the ship as well as to develop a technique of flow visualization which would be of value toward clarifying the structure of ship wake vortices. Measurements (or observations) were made for the following items: (1) velocity profile, and (2) turbulence, in the boundary layer, and (3) flow visualization of the separated vortices. In experiments (1) and (2), measurements were made at three points on the port and one point on the starboard. Velocity profiles were measured with the aid of a combination of pressure tubes and manometers. In place of the piezometers employed in the past two experiments, a new type of manometer set was designed and was put to practical use. Turbulence measurements were made just in the same way as in the previous experiments. Visualization of the wake vortices was carried out by attaching to the underwater hull surface a few of bags packed with pigment and observing motion of colored water downstream. Observations were also made in order to clarify the stereoscopic structure of two kinds of separated vortices originating from the bow and from the stern by attaching fluorescein (green), and rhodamin B (red), bags at different points on the hull. Tolerably satisfactory results were obtained through all of these experiments, and some confidence could be gained in applicability of the method to larger commercial vessels.
社団法人日本船舶海洋工学会の論文
1970-07-31

実船における境界層の計測(II)

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