ジンベエザメの行動追跡を目的とした発信機装着用曳航体の流体力特性

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Flume tank experiments were performed to examine the fluid characteristics of the towing buoy in which the transmitter was installed to track movement of whale shark. The improved-type buoy is made of syntactic foam with high pressure-tightness and buoyancy, and has a streamline shape with the dimension of 48cm long in total, 4cm and 6cm in maximum width and height, compared with the conventional buoy of 39cm long and 12cm in maximum width. The towing drag, lateral force, lifting force, and pitching moment of their buoys were measured with a six-component balance at attack angles ranging from -30°to 30°, and at current speeds ranging from 40 to 140cm/s. Coefficient of each force, moment, and pressure center were also obtained. The drag coefficient of the improved-type buoy was below 0.1 within the attack angle range between ±10°, which is smaller than that of the conventional type at any attack angle. Coefficient of pitching moment of improved-type buoy within the attack angle range between ±10° was quite small, and larger than that of the conventional type. The conventional buoy has its pressure center in the anterior of the body, which causes unstable posture in towing. In contrast, the improved-type buoy has a pressure center in the posterior. Therefore, its posture in towing is stabilized around the attack angle of -5° when the wire-attachment position is determined in the anterior of the buoy, taking the gravity center of the body and transmitter into consideration.
2009-02-15

ジンベエザメの行動追跡を目的とした発信機装着用曳航体の流体力特性

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