実海域航行中船舶の推進性能分析法に関する研究 : 船舶プロペラ表面粗度影響の評価

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The propulsion performance of actual ship at sea tends to deteriorate mainly due to the fouling of hull and propeller. It is important, therefore, to monitor the present situation of ship propulsion performance in order to make an optimum operation and maintenance planning for cost saving. The monitoring method of propulsion performance by the use of Logbook data has been to analyze the consumption and/or ship velocity, which is just variation of overall propulsion performance. This paper proposes an new analyzing method of Logbook data, which could make it possible to investigate the surface fouling effects on hull resistance and propeller performance individually. At first, the surface roughness effects on propeller performance are calculated using the numerical estimation method developed by the authors in the previews paper, and the validity of estimate are conformed by the experimental results of model and actual propellers. Next the behaviors of propeller torque and thrust coefficient change due to surface fouling is investigated, and it is revealed that is a certain relation between the changes of torque and thrust coefficient ΔK_Q and ΔK_T. The paper suggests that is possible to predict simply ΔK_T from ΔK_Q by the use of relation instead of carrying out the numerical calculation. Finally, based on the above results, the paper indicates the possibility of a new useful monitoring method of ship propulsion performance at sea, which can analyze the recitations of hull resistance and propeller performance individually.
社団法人日本船舶海洋工学会の論文
2003-03-25

実海域航行中船舶の推進性能分析法に関する研究 : 船舶プロペラ表面粗度影響の評価

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