バルブ付肥大船型の推進性能に関する研究 : 2軸船の尺度影響および船尾形状に関する研究

概要

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This report deals with researches into the scale effect of resistance and self-propulsion factors, as well as the effect of the stern shape upon the propulsive performance for extremely full hull forms with the twin screws. The main results obtained from the test are as follows; 1. Variation of form factors due to Froude number differs in tendencies for each of test conditions, and though the values of the wake and thrust deduction coefficients vary with Reynolds number, the values of the relative rotative efficiency are almost constant over the test range. 2. Remarkable differences are not found in the propulsive performance for such full aft bodies and aft frameline shapes. 3. Wake gain may be expected by designing the bossing properly or choosing a proper direction of propeller rotation. Accordingly, it may be needed to investigate precisely characteristics of the wake furthermore by 5-hole pitot tubes for instance.
1971-03-31