船尾流場の乱れ成分に関する実験的研究 :その2 : 船体平行部を長くした船型の平均流と乱れ成分

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This paper presents results of mean velocity and turbulence measurements in the three dimensional boundary layers and wakes around a long ship model in a low-speed wind tunnel. The long ship model was obtained by inserting the 4m length parallel body into the 2m length normal ship model which had been tested in the 1st report. The effects of the boundary layer thickness on the stern flow field became evident after comparing the results of measurements in the boundary layers of the long ship model with those of the normal ship model. Moreover, a new analyzing method was developed to measure the mean velocity and the turbulence in three dimensional flow with a single-type hot-wire anemometer. Comparing the stern flow field of the long ship model with that of the normal ship model, following facts were found. (1) The longitudinal vortices are located at the same place with the same vorticity. (2) The ridge-like parts are located at the same position away from the ship model surface on the contour curves of the turbulent kinetic energy. (3) The non-dimensional normal distance (/_)(L/B) gives very good agreements on the profiles of the mean velocity and the Reynolds stresses distributions in the boundary layers between the long and the normal models.
社団法人日本船舶海洋工学会の論文