SCP理論設計法の実機プロペラへの応用

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The present paper describes the first applied results of the SRI theoretical design method for supercavitating propellers (SCP) to triple-screwed propellers of a 23m-class high speed boat. The design speed of the present boat was required to be faster than 38 knots at the maximum continuous engine output (MCR). Then, three propellers were designed by the SCP theoretical design method at the design speed of 43 knots. In sea trials, the boat equipped with the present SCPs ran at 41.1 knots at the maximum engine output but the boat speed obtained at the designed engine revolution rate was less than the designed speed. On the other hand, the boat equipped with conventional propellers (CP) ran around 3 knots faster than with the SCPs at the MCR This might be caused due to the underestimation of effective horse power for this boat. In order to analyze the trial data and designed results, a resistance test was performed and the effective horse power of this boat was predicted. Cavitation tests were also carried out on two kinds of propeller models at 0 and 10 degree of shaft inclinations. From the analysis of model tests and trial data, it was found that the SCPs were designed to be more lightly loaded than the CPs. A good correlation between the trial and model tests was observed on the torque of two kinds of propellers and the thrust of the CP, while a poor correlation was found on the thrust of the SCP. It was concluded that the improvement of design condition prediction is necessary to design higher performance SCPs.
社団法人日本船舶海洋工学会の論文
2000-09-04

SCP理論設計法の実機プロペラへの応用

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