LDVによるプロペラ回転中の模型船尾流場計測 : 練習船"青雲丸"

概要

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In the study of propulsive performance of a ship under propeller-hull interaction, the flow field measurement around a ship in self-propulsion condition is important. The authors measured the flow field at the stern of a model ship in self-propulsion condition using LDV (Laser Doppler Velocimeter) in a towing tank at the Ship Research Institute. The measurements were made at three sections before and after the propeller. The velocity distributions both with and without a rotating propeller were measured, from which the mean velocity distribution and the standard deviation of the fluctuating component were obtained. The fluctuating component of the flow velocity under the rotating propeller condition may be decomposed into two parts. One is an ordinary fluctuation of the wake flow, and the other is the fluctuation due to rotating propeller blades. Therefore the periodically fluctuating component corresponding to the propeller blade frequency was extracted from the measurements, based on the propeller phase information. As the result, the flow field which contains the tip vortex and the free vortex sheet emanated from the trailing edge was made clear in the velocity distribution behind the propeller rotating in the hull wake.
独立行政法人海上技術安全研究所の論文
1993-11-30