翼素のウオッシュバック効果に關する理論的研究

概要

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In this paper the Author gives a result of theoretical study, made by him, on the effect of "washing back" the blade-sections of marine propellers. The circular-back or ogivai blade-section is taken as basic blade-form, and the effect of making "wash-back" to it is studied for the following two different working conditions.(1) When there occurs no cavitation : Here the blade-section is regarded as made up of circular-arc triangle, and its lift coefficient is calculated by means of conformal transformation, using some properties of hypergeometric functions.(2) When cavitation is occurring severely : For this case the flow around the bladeelement is reduced to the discontinuous flow past a curved barrier, and lift-and drag-coefficient is calculated in the similar way as the Author's previous paper "On Theoretical Study of Performance of a Blade-element under Cavitation" [Zosenkyokai Zassan, Dec., 1941] Lastly, the Author gives some numerical illstrations to the result obtained, and shows that, when a moderate amount of wash-back is made, some increase in the lift coefficient may be expected both for two cases (1) and (2), mentioned above.
社団法人日本船舶海洋工学会の論文
1943-08-30