鱼游动涡结构PIV实验研究

PIV experimental study on fish swimming vortex structure

鱼类逃逸和巡游已逐渐成为鱼类仿生推进水动力学领域的研究热点,其研究结果为水下航行器推进技术提供了很好的理论基础和指导意义。利用平面PIV技术测量了斑马鱼在水中游动时的尾迹流场,分析了不同游动状态下的鱼尾迹涡结构的变化规律;同时利用Tomo-PIV技术测量了曼龙鱼游尾迹三维流场,获得了涡环链结构。结果表明:不同游动状态下,鱼游尾迹表现出不同的流动结构和尾迹模式,对其进行研究有利于进一步揭示鱼游动的水动力学机理。

Fish escape and cruise have gradually become a research hotspot in the field of fish bionic propulsion hydrodynamics.Study of fish escape and cruise can provide a good theoretical foundation and guidance for the underwater vehicle propulsion technology.In the present work,planar PIV is used to measure the wake flow field of zebrafish swimming in the water,and different fish wake vortex patterns under different swimming states are further analyzed.Meanwhile,Tomo-PIV is also used to measure the three-dimensional wake flow field of the fish swimming,and the linked ring vortex wake pattern is obtained.All the results indicate that the fish swimming wake presents different flow structures and wake patterns under different swimming conditions,which is helpful to reveal the mechanism of fish swimming.