水面滑走板の壓力抵抗に關する一考案
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概要
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Many researches about the pressure resistance of the gliding plate on the surface of water have been published by various authors. Their method used may however be devided in two kinds of approximation in general. One is the method by which only the wave making ressistance of the plate is obtained, and the other is that of simplifying the problem by neglecting the gravitational force. The results obtained are quite different in each other. The resistance by the latter method and the wave resistance by the former one are not the same thing, but, in actual, both appear at the same time. Now the writer investigated the motion of water under the gravity by using Lambs theory, considering a certain pressure distribution applied on the surface of water. It was discovered that in this theory the emergence of the sprash at the leading edge can be expressed by the singularity of the pressure distribution at this point, and due to this singularity a resistance other than that of wave making exists and is the very resistance obtained by the method of neglecting gravity. This resistance named sprash resistance occupies most part of the pressure resistance at high Froude number, while the wave resistance becomes small quantity. The variation of the wave resistance due to the change in the shape of the plate is comparatively small, but the sprash reisstance receives a great effect, and it can be concluded that the camber of the plate generally reduces the sprash resistance.
- 社団法人日本船舶海洋工学会の論文
- 1947-10-25