仿生机器鱼外形设计及流场阻力数值分析
Shape Design and Numerical Analysis of Flow Field Resistance of Bionic Robot Fish
耿文豹 1魏永康 1洪树峰 1黄佳进1
作者信息
- 1. 汕头大学 工学院,广东 汕头 515063
- 折叠
摘要
在机器鱼设计过程中,鱼体、尾鳍的外形设计十分重要.为了研究流体阻力更小、推进效率更高的全鱼外形,以金枪鱼、海豚和旗鱼为仿生对象,建立了 3 种不同的机器鱼模型,运用动网格技术定义了边界条件,并用数值方法分析了 3 种模型在流场中的速度、鱼体受力等水动力性能.结果表明:旗鱼模型游动性能最好,相比于金枪鱼与海豚模型,行进过程中受到的阻力更小,且通过斯特罗哈尔数比较旗鱼模型推进效率更高;另一方面,新月鳍仿生鱼游动速度最高,是八字鳍仿生鱼的 2.2 倍左右,旗鱼新月鳍机器鱼具有更好的游动性能.计算结果对减小机器鱼流体阻力,提高其推进效率提供了较好的参考价值.
Abstract
In the process of robotic fish design,shape design of fish body and tail fin is very important.In order to study the shape of the whole fish with less fluid resistance and higher propulsion efficiency,three different robotic fish models are established taking tuna,dolphin and sailfish as bionic objects.Boundary conditions are defined using dynamic mesh technology.The hydrodynamic performances such as velocity and fish body force of the three models in the flow field are analyzed by numerical methods.The results show that the sailfish model has the best swimming performance,and the drag force during travelling is smaller than that of the tuna and dolphin models,and the propulsion efficiency of the sailfish model is higher by comparison of Strouhal number.On the other hand,the crescent-fin bionic fish has the highest swimming speed,which is about 2.2 times of the octagonal-fin bionic fish.Therefore,sailfish crescent-finned robotic fish has better swimming performance.The calculation results provide a good reference value for reducing the fluid resistance of the machine fish and improving its propulsion efficiency.
关键词
仿生机器鱼/静水阻力/外形/推进效率/数值分析Key words
bionic robotic fish/hydrostatic drag/shape/propulsive efficiency/numerical analysis引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据