摩擦抵抗に於ける形状影響(第3報)

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According to the idea established in parts I and II of this paper, the author has investigated the following questions-that is-1. the variation of form effect due to the variation of Froude's No., 2. the frictional stresses and resistance of a ship model, 3. the effects of the propeller action and 4. the calculation of the turbulent boundary layer around the solid of revolution. The results are : - 1. When Froude's No. increases or decreases the variation of form effect is small, but it has a little tendency to flatten the hollows of wave resistance curve. 2. The calculated frictional resistance of a ship model is 4% lower than measured value, but if it is calculated in accordance with Froude's formula, the differnce from the experimental value will be 12%. The calculated value will vary considerably if the relation between ζ and Г changes to some extent. 3. The effects of propeller action are small, the augmentation of frictional resistance due to propeller is the order of 1%. The calculation has been worked out in the case of 2-dimensional flow, the propeller is represented by a single sink. 4. Applying Buris'theory to the flow around a solid of revolution, the momentum equation has been integrated. The calculated frictional resistance shew good proximity to the results obtained experimentally by Amtsberg.
社団法人日本船舶海洋工学会の論文