Journal of Dalian Ocean University  2023, Vol. 38 Issue (3): 524-532 DOI: 10.16535/j.cnki.dlhyxb.2022-223 |
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| Field test on the flow velocity characteristics of tank aboard an aquaculture vessel |
| QIN Kang，CUI Mingchao，LIU Huang*，ZHANG Chenglin
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| 1.Fishery Machinery and Instrument Research Institute，Chinese Academy of Fishery Sciences，Shanghai 200092，China；2.College of Navigation and Ship Engineering，Dalian Ocean University，Dalian 116023，China；3.Joint Research Laboratory for Deep Blue Fishery Engineering Equipment Technology，Pilot National Laboratory for Marine Science and Technology (Qingdao)，Qingdao 266237，China |
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Abstract Deep-sea aquaculture, represented by cruising aquaculture vessels, is an emerging aquaculture method to expand ocean space. In order to understanding of the influence of rolling motion on the flow velocity in fish tank aboard aquaculture vessels, the field test method is used to probe the flow velocity characteristics in the fish tank of an aquaculture vessel, and to analyze its suitability for fishing. The results showed that the influence of rolling motion on the horizontal flow velocity in the fish tank was ignored under the slight rolling condition, and the velocity variations was attributed to jets. Under a high sea state with a larger rolling motion, the influence of rolling motion on the horizontal flow velocity in the fish tank was remarkable. The horizontal flow velocity in the fish tank was found to be increased, and the position of the maximum horizontal flow velocity was shown to be shifted to the middle of the tank with the increase in the rolling angle amplitude at the constant rolling period. The vertical flow velocity in the central area of the tank was generally upward, and the vertical flow velocity in the area near the bulkhead was generally downward under the slight rolling condition. The vertical flow velocity area at the center of the tank was reduced, and the maximum vertical flow velocity in the upward direction was decreased with the increase in the rolling angle amplitude during the constant rolling period, promoting the sedimentation of biological solids in the central area of the fish tank, which is more conducive to sewage collection and discharge. When the angular amplitude of the rolling motion is not more than 5°, the flow velocity in the fish tank aboard an aquaculture vessel at anchor is suitable for the cultivation of Larimichthys crocea over 1 year old, of which body length is longer than 27 cm.
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Published: 12 July 2023
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