基于PIV技术草金鱼幼鱼转弯运动动力学特性

doi:10.16535/j.cnki.dlhyxb.2023-165

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大连海洋大学学报 ›› 2024, Vol. 39 ›› Issue (1) : 92-100. DOI: 10.16535/j.cnki.dlhyxb.2023-165

基于PIV技术草金鱼幼鱼转弯运动动力学特性

张娟,张英,黄小双,刘必林,陈新军,孔祥洪*,陈家祺

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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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摘要

为了解观赏鱼类在转弯运动状态下的推进机理及推进性能，以体长为5～8 cm的草金鱼(Carassius auratus)幼鱼为研究对象，利用粒子图像测速技术(particle image velocimetry，PIV)和涡量矩定理，对机动转弯运动流体流场变化进行追踪，分析了幼鱼转弯过程中尾部的运动特征和动力学特性。结果表明：草金鱼幼鱼转弯过程中，形态结构主要发生C型、S+C型结构两种变化，转弯过程中幼鱼尾部周围流场的正、负值涡量交替出现；鱼体形态呈C型结构转弯时，幼鱼平均速度为0.130 7 m/s，流体对幼鱼尾部产生的正作用力为2.06～133.49 mN，负作用力为-83.85～-2.15 mN；鱼体形态呈S+C型结构转弯时，幼鱼平均速度为0.104 4 m/s，流体对幼鱼尾部产生的正作用力为24.06～80.95 mN，负作用力为-59.60～-5.86 mN。研究表明，转弯时鱼体形态呈C型结构变化的机动性能优于鱼体形态呈S+C型结构变化，且不同转弯类型产生作用力峰值的时刻不同。

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.

导出引用

张娟, 张英, 黄小双, 刘必林, 陈新军, 孔祥洪, 陈家祺. 基于PIV技术草金鱼幼鱼转弯运动动力学特性[J]. 大连海洋大学学报, 2024, 39(1): 92-100 https://doi.org/10.16535/j.cnki.dlhyxb.2023-165

ZHANG Juan, ZHANG Ying, HUANG Xiaoshuang, LIU Bilin, CHEN Xinjun, KONG Xianghong, CHEN Jiaqi. Analysis of dynamic characteristics of turning movement of juvenile grass golden fish based on PIV technology[J]. Journal of Dalian Fisheries University, 2024, 39(1): 92-100 https://doi.org/10.16535/j.cnki.dlhyxb.2023-165

中图分类号： S 931.9