水面滑走體の造波抵抗理論
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概要
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The writer previously researched the pressure resistance of a plate gliding on the surface of water in the two-dimensional case, and it was found that the pressure resistance consists of sprash resistance and wave resistance. The sprash resistance has the same properties in the three-dimensional case as in the two-dimensional one, but the wave resistance is different in each other, and though the two-dimensional motion is comparatively simple, the three-dimensional motion has very complex features. The present investigation sho ws that the fluid motion near the gliding body bears a great resemblance to the vortex motion occuring behind a wing when the speed of the gliding body is sufficiently large, so wave resistance has the same properties as that of induced resistance of the wing. The writer has also found an approximate formula by which the shape of gliding surface for a given pressure distribution can easily be calculated when its aspect ratio is considerably large. The shape of the gliding surface that gives the minimum wave resistance was calculated and such a conclusion has been obtained that for large Froude numbers the minimum wave resistance is given by the pressure surface whose inclination to the horizontal plane has a lateral distribution of nearly elliptic type.
- 社団法人日本船舶海洋工学会の論文
- 1949-07-25