2. Measurement of Fullscale Ship Wake by Tracer and Multi TV Camera System
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概要
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A new velocity measurement system was developed and applied for the fullscale ship wake measurement. In this system, time history of space coordinates of a tracer is measured and processed by three TV cameras, a video system, an image processor and a personal computer. Fundamental tests in laboratory showed that the present system can measure the velocity of tracers with an accuracy of about 5%, which is almost same as that of a 5 hole Pitot tube. The wake distribution was measured on a 105m long 5,800 displacement ton training ship "SEIUN-MARU". The 3-dimensional velocities of tracers were measured from the synchronized screen images of CCD TV cameras which were installed on the hull surface. The 3-dimensional velocity distributions, i.e. wake distributions, were then calculated at the sections near the ship stern by interpolating the measured tracer velocities. The measurements were made twice. One was with a conventional propeller fitted and the other was with a highly skewed propeller fitted. In the first experiment, a LDV (Laser Doppler Velocimeter) measurement was also performed by another research group. Therefore, the authors could compare their result with the simultaneously measured LDV result in addition to the comparison between the different propellers. The following results were obtained: (1) The present measurement result was very reasonable and agreed fairly well with the LDV result. It can be said that the present method is simpler, robuster and less expensive than the other fullscale wake measurement methods such as LDV and Pitot tube. In addition, the present system can measure the 3-dimensional velocity distribution in the measurement volume. (2) The secondary flow distribution clearly showed the development of bilge vortex. (3) The wake distribution in the case of highly skewed propeller was similar to that of the conventional propeller. However, the wake fraction was about 0.1 lower in the case of the highly skewed propeller than that of the conventional propeller
- 社団法人日本船舶海洋工学会の論文
著者
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KATO Hiroharu
Faculty of Pharmaceutical Sciences, Kyushu University
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Yamaguchi Hajime
Faculty Of Engineering University Of Tokyo
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Yamaguchi Hajime
Faculty Of Engineering The University Of Tokyo
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Kato Hiroharu
Faculty Of Engineering The University Of Tokyo
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Komura Takashi
Faculty Of Engineering The University Of Tokyo
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