9 気泡流中におけるプロペラ単独特性 : 第2報:気泡流中のプロペラ性能試験結果

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The aim of this study is to clarify the characteristics of the Propeller Open water Test (POT) in bubbly flow. The part 1, i.e. the previous paper, has shown the experimental setup, conditions, the distributions of the local void ratio and flow field at the propeller disk. The part 2, i.e. this paper shows the POT results in the bubbly flow. The POT has been performed under several void fraction values between 0% and 5%. The wake effect due to the upstream bubble generator has been corrected using the thrust identity method. The thrust, torque, and efficiency of the propeller in bubbly flow become smaller than those without bubbles, and their reduction becomes larger as the void fraction in the propeller inflow increases. Tests using two different sizes of propellers have shown that the decrease in propeller efficiency due to bubbles is generally larger with the larger propeller. Tests at small pitch angle change have shown that the propeller efficiency reduction is small at the pitch angle change of ±1 degree, while that at the pitch angle change of ±2 degrees is greater, especially at large advance coefficients. A schematic diagram for the effects of air lubrication on both the ship and the propeller shows that, although the propeller efficiency slightly decreases due to the bubble inflow, the decrease in propeller load factor due to the decrease in ship's drag helps to recover the propeller efficiency.
社団法人日本船舶海洋工学会の論文

9 気泡流中におけるプロペラ単独特性 : 第2報:気泡流中のプロペラ性能試験結果

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