Journal of Dalian Ocean University  2024, Vol. 39 Issue (1): 92-100 DOI: 10.16535/j.cnki.dlhyxb.2023-165 |
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| Analysis of dynamic characteristics of turning movement of juvenile grass golden fish based on PIV technology |
| ZHANG Juan，ZHANG Ying，HUANG Xiaoshuang，LIU Bilin，CHEN Xinjun，KONG Xianghong*，CHEN Jiaqi
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| 1.College of Marine Living Resource Sciences and Maragement，Shanghai Ocean University，Shanghai 201306，China；2.National Engineering Research Center for Oceanin Fisheries，Shanghai 201306，China；3.Key Laboratory of Sustainable Development of Oceanic Fisheries Resources，Ministry of Education，Shanghai 201306，China；4.Key Laboratory of Oceanic Fisheries Exploration，Ministry of Agriculture and Rural Affairs，Shanghai 201306，China |
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Abstract In order to understand the propulsion mechanism and propulsion performance of ornamental fish in the state of turning motion, the juvenile grass golden fish (Carassius auratus) with body length of 5-8 cm was taken as the research object, and the changes of the fluid flow field of the maneuvering motion were tracked by particle image velocimetry (PIV) and vorticity moment theorem, and the motion characteristics and dynamic characteristics of the tail of the juvenile fish during the turning process were analyzed. The results showed that the morphological structure of the juvenile C-shaped and S+C-shaped mainly changed during the turning process, and the positive and negative vorticities of the flow field around the tail of the juvenile fish appeared alternately during the turning process. When the body morphology of the fish is C-shaped and turned, the average velocity of the juvenile is 0.130 7 m/s, and the positive force of the fluid on the tail of the juvenile fish is 2.06 mN to 133.49 mN, and the negative force is -83.85 mN to -2.15 mN. When the body morphology of the fish is S+C structure, the average velocity of the juvenile is 0.104 4 m/s, and the positive force of the fluid on the tail of the juvenile fish is 24.06 mN to 80.95 mN, and the negative force is -59.60 mN to -5.86 mN. The results show that when turning, the maneuverability of the fish body shape with C-shaped structure change is better than that of fish body shape with S+C structure change, and the time of force peak is different for different turning types.
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Published: 13 March 2024
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