活魚運搬船に関する基礎的研究(I) : 船体周りの流場と船体抵抗

概要

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A large live fish carrier is circulating the water in each tank by draining the used water from the side shell exits and taking in the fresh sea water from the bottom entrances of the ship by the pressure differences. Therefore, it is demanded that flow field around the hull is grasped sufficiently, in order to circulate the water effectively with small increase of hull resistance. We measured the pressure on the bottom and the side of shell directly at 5 sections of a model boat. Next, we measured velocity distributions using 5-hole spherical pitot tube at a position 1cm apart from the hull surface of a model boat to obtain pressure distribution on the hull surface. Furthermore the pressure distribution on the hull surface was calculated by using the simple boundary element method. From these results, we show that the values calculated by the boundary element method using the velocity potential are sufficiently useful. Furthermore we performed the resistance test of the 2m model which had 46 entrance holes (each diameter is 11.0mmφ) at the bottom and 56 exit holes at the side shell. The model was tested in the circulating water channel of Kagoshima University in two conditions of the model with and without holes. As a result, the resistance of a model boat with open holes increases by about 5% in comparison with the resistance of a model boat without holes.
社団法人日本船舶海洋工学会の論文
1995-09-04