摩擦抵抗に於ける形状影響 (第3報)
1956 年 1956 巻 89 号 p. 13-22
詳細
1956 年 1956 巻 89 号 p. 13-22
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 ac tion 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 diff ernce from the experimental value will be 12%. The calculated value will vary considerably if the relation between ζ and Γ 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 Buns' 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.
