漁船のプロペラ起振力減少法に関する水槽試験例 : 水ジェットによる

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As reduction method of propeller-excited vibratory forces and moments, adoptions of ducted propeller, highly skewed propeller, flow control fin, stern bulb, auxiliary propeller, water jet and so on are suggested up to now. Among these, water jet method is discussed in this paper. Almost all of fishing boats have the pump capacity enough for using for other purposes. In utilizing this pump, it may be possible to reduce the wake peak by blowing out the water jet flow from the stern before the propeller position. Experiments were conducted on the model of an ocean going stern trawler. Circular jets through the pipes connected to the pump which was set up in the inside of the model, were blowed out toward the propeller. According to the records of the thrust variation on one blade in the cases of with and without water jet flow, a favorable effect of the water jet flow was realized. Adoption of a simple apparatus in supplying a water jet flow led to the reduction over 20% of the thrust variation, which was supported by the theoretical calculation in using measured velocity distribution in both cases. The estimated power necessary for circular jets on a ship is about 82ps and about 3% of main engine's out put. This paper might be considered as the supplement to references 1) and 2).
独立行政法人海上技術安全研究所の論文
1979-01-31