漁船に装備されたバウスラスターの性能に及ぼす前進速度影響の推定

概要

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It is important to know the present condition of marine biological resources to control the resources. Many fishing vessels that are engaged in research activities install bow thruster to secure high maneuverability for efficient surveying. Bow thruster is effective device to improve ship maneuverability in slow speed, but it is known that the control forces generated by the thruster decrease under the influence of ship forward speed. Therefore, it is necessary to take into account the transition of performance at the design stage. The decrease of forces has relation to the interaction between ship hull and jet, and a theoretical method to predict the influence is proposed by one of authors. In this paper, we predicted the influence of forward speed on the bow thruster performance installed in a fishing vessel by numerical calculations. The calculation was carried out by using the entrainment function taking into account the inward flow into the jet induced by a pair of concentrated vortices on the rear side of the jet. Parameters contained in the entrainment function were determined by the use of empirical formula proposed by Pratte et al. From the results of numerical calculations, the present method expresses the decrease of lateral force and yaw moment generated by the bow thruster.
社団法人日本船舶海洋工学会の論文
2000-03-29