鳍条运动模式对仿生波动鳍推进力影响的研究

发布时间：2018-03-18 23:30

本文选题：仿生波动鳍　切入点：鳍条　出处：《工程设计学报》2017年01期 　论文类型：期刊论文

【摘要】：仿生波动鳍的鳍条运动模式分为等幅和变幅两种类型,通过实验发现这2种鳍条运动模式下所产生的游动性能存在着较大的差异.为了揭示这种差异存在的内在缘由,建立基于鳍条这2种运动模式的仿生波动鳍运动学方程.利用计算流体动力学原理,比较不同运动学参数下2种运动模式鳍面压力分布情况,分别给出2种模式下波动鳍产生的无量纲阻力系数随时间的变化情况以及无量纲阻力系数时间平均值随频率、摆幅和波长的变化规律,给出鱼鳍模型中部沿鳍条方向切面的速度场和压力场.结果表明:2种模式下产生的推进力均随频率、摆幅和波长的增大而增加,但等幅摆动产生的推进力始终小于变幅摆动;2种模式下模型中部切面的速度场和压力场存在明显的差异,而尾迹二维涡量场结构和分布形态十分相似,说明影响2种模式游动效果的主要原因之一来自于沿鳍条方向的差异.结论进一步阐述了依赖鱼鳍波动推进的水生生物体高效游动的本质,也为研制高性能的仿鱼鳍波动推进装置提供了参考.
[Abstract]:The motion patterns of bionic undulating fins can be divided into two types: equal amplitude and variable amplitude. It is found that there are great differences in swimming performance between the two kinds of fin motion modes. A bionic wave fin kinematics equation is established based on the two motion modes of fins. The pressure distribution on the fin surface of the two motion modes under different kinematic parameters is compared by using the principle of computational fluid dynamics (CFD). The variation of dimensionless drag coefficient with time and the variation of the mean value of dimensionless drag coefficient with frequency, swing amplitude and wavelength under two different modes are given, respectively. The velocity field and pressure field along the tangent plane along the fin direction in the middle of the fin model are given. The results show that the propelling force generated by the two modes increases with the increase of frequency, swing and wavelength. However, the propelling force produced by the constant amplitude swing is always smaller than that of the variable amplitude swing. The velocity field and the pressure field in the middle of the model have obvious differences, while the structure and distribution of the wake two-dimensional vorticity field are very similar. It is shown that one of the main factors affecting the swimming effect of the two models comes from the differences along the fin stripe. Conclusion the essence of efficient swimming of aquatic organisms dependent on fin fluctuation and propulsion is further expounded. It also provides a reference for the development of a high performance fin wave propulsion device.
【作者单位】：台州职业技术学院机电工程学院;
【基金】：浙江省自然科学基金资助项目(LY15E060001) 台州职业技术学院一般课题(2015YB02)
【分类号】：TB17

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