水深と抵抗との關係に關する實驗的研究

概要

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The authors examined the effects of depth of water on the resistance of ships by the towing experiments of warship models at several depth of tank water, and the following general conclusions were obtained : (1) The resistance curve in shallow water shows a hump, and the shallower the depth of water, the lower the speed at which hump occurs. (2) The trim of the ship changes abruptly at the critical speed at which the abovementioned hump occurs. (3) Percentage increases of effective horse power in shallow water for ships examined by the authors are shown in Figs. 7 to 16. (4) It is impossible to find a general law for estimating the influence of depth of water on the resistance, as this amount differs considerably according to the principal dimensions and ship form in addition to the speed and the depth of water. (5) The critical speed can be expressed by the following formula : -[numerical formula] where D……Depth of water in m., ν……Critical speed in m/sec., L……Length of the ship in m., k, k_1……Constants having values shown in Table 4. (6) Minimum depth of water at which resistance does not increase can be estimated roughly from Fig.23 or Fig.24 according to the length and speed of the ship.
社団法人日本船舶海洋工学会の論文
1937-12-28