可変ピッチプロペラ装備船のサーフェースフォース : 実測値と簡易推定値との比較

抄録

The measurement of fluctuating pressure on the hull surface just above the propeller and the propeller cavitation observation of the training ship "FUKAE MARU" of Kobe University of Mercantile Marine have been carried out. Her propeller is pitch-controllable and moderately skewed. By the use of those date, this paper examines the validity of the conventional simplified method for estimating the fluctuating pressure in the case of a skewed CPP. The examination makes clear that (1) among 3 methods examined here, that is Takahashi, Johnsson and Holden, the Johnsson's method is most correct, (2) all of them, however, have been developed on basis of the data of FPP, so that they cannot estimate the influence of blade angle especially when the cavitation is occurred, (3) the behavior of the propeller cavitation is seems to be dominantly affected by the attack angle at the blade tip, so that the influence of the blade angle of CPP would be possibly estimated by the attack angle.