A Consideration of Model-Ship Correlation on Wake Fraction

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  • SUDO Shouichi
    Technical Research Laboratory, Hitachi Shipbuilding and Engineering Co., Ltd.
  • TANIMOTO Takaaki
    Technical Research Laboratory, Hitachi Shipbuilding and Engineering Co., Ltd.

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This paper studies wake data of large tankers arranged in order depending on a statistical method of analysis; this study is preparatory to investigations into model-ship correlation on wake fraction. An accurate correction for the scale effect, between models and ships, on wake fraction is a subject of practical and scientific importance. Wide scatter of wake data which have been so far assembled makes us confused when considering model-ship correlation. Accordingly, the character of the scatter was examined first, and great efforts were exerted to eliminate sources of systematic errors. The datathus put in order were analyzed by the Product Formula on the basis of several parameters which represent the characteristics of hull form and hull-propeller interaction. The form parameters finally adopted are as follows. C_<BA> : Aftbody block coefficient. L_R/B : Ratio of length of run to breadth. L_R/d : Ratio of length of run to draught. [numerical formula] : Area ratio of immersed midship section to propeller disk. ∇^<2/3>/D^2 : Ratio of 2/3 power of displacement to square of propeller diameter. The analytical results are presented in the formulae. [numerical formula] [numerical formula] For practical purposes, the following formula has been derived from above-mentioned formulae for the model-ship correlation. [numerical formula] Moreover, this is simplified as follows for convenience in the approximate use. 1-w_s/1-w_s=(C_<BA>^2×B/d)^<0.415>

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  • 関西造船協会誌

    関西造船協会誌 125 (0), 7-15, 1967

    公益社団法人 日本船舶海洋工学会

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