open access

https://hdl.handle.net/2115/54817

Study on the Design of Towed Body System for Continuous Water Sampling

日本語

CFD analysis

2014-03-14

北海道大学大学院水産科学研究院

北海道大学水産科学研究彙報

64(1)

1-8

A seawater sampling system using underwater towed body was developed to obtain the water continuously. The system was composed of two towed bodies, which are vertically linked each other, to sample water in different layers. The range of towing speed and target depth of the system were planned as up to 5.0 kt, and 10.0 to 20.0 m, respectively. At first, hydrodynamic characteristic of the towed body was examined using CFD analysis, and then the towing depth under the planned speed was predicted dynamically. Finally, the validity of the towed body was confirmed at sea experiment. In the sea experiment, the depth of each towed body was measured changing towing speed on both conditions with hose to pump-up water and without it. The depth at the case with hose decreased by about 60 percent to compared with the case without hose. The depth of the lower side body with hose reached 20.0 m when the towing speed was 3.3 kt. Based on these results, it was estimated that the towing speed to attain the depth of 20.0 m will increase to 5.0 kt by decreasing hose diameter from 18.0 mm to 8.0 mm, or increasing each body weight to 150.0 kg.

紀要論文

Version of Record

1346-1842

AA11547977