A Performance Prediction Method for Contrarotating Propeller Ships

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  • 二重反転プロペラ船の馬力推定法
  • ニジュウ ハンテン プロペラセン ノ バリキ スイテイホウ

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The model test and its analysis to obtain the basic data for performance prediction of full-scale ships equipped with contrarotating propellers are shown. Particular emphasis is given on a method for determining the interference component of effective wake fraction induced by fore and aft propellers.The experimental results show that the present method is reasonable.<BR>Secondly, a performance prediction method is described to estimate the delivered horsepower DHP of the full-scale ships equipped with contrarotating propellers by the extrapolation of model tests results. Then, the estimations of DHP of the two ships by the present method are made. The main findings are : <BR>(1) The DHP and interference components of effective wake fraction are significantly influenced by the change of propeller load factor between model and full-scale ships.<BR>(2) On the other hand, the DHP is hardly influenced by the difference of share of the rudder component of effective wake fraction between fore and aft propellers.<BR>(3) The DHP differs about 2%from the value obtained by treating one whole contrarotating propeller as a single propeller, which is due to the influence of imbalance of load distribution between fore and aft propellers.

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