キャビテーション性能の優れたプロペラの開発 : 第1報 : キャビティ体積の少ないプロペラ

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New propellers with better cavitation performance in comparison to a MAU type one were designed, matching the equivalent two-dimensional foils obtained from lifting surface calculations with those obtained from foil section design theory by prescribing the pressure distribution. In designing the new propellers only the section shape and pitch were altered, keeping all other parameters same as the MAU type one. Flat pressure distribution except near the leading edge, based on the experimental results of the two-dimensional foils presented in a previous paper, was adopted so as to give less cavitation. Experiments were performed, using both the new and the MAU type propellers. The following results were obtained and the validity of the above-mentioned design concept and method was verified. (1) Both cavity extent and thickness of the new propellers were remarkably reduced in comparison to the MAU type one. Cavity volume of the new propellers reduced to less than half of that of the MAU type one. (2) Fluctuating pressure due to the new propellers was about half of that due to the MAU type one. This pressure level agreed approximately with that in non-cavitating condition. (3) The new propellers had nearly the same efficiency as the MAU type one. (4) The load distribution of the new propellers became higher in the aft part of the blade section. If the region near the trailing edge was too highly loaded, the thrust of the new propeller became lower than that of the lifting surface calculation. This fact should be kept in mind while designing propellers in a similar manner.
社団法人日本船舶海洋工学会の論文

キャビテーション性能の優れたプロペラの開発 : 第1報 : キャビティ体積の少ないプロペラ

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