摘要
提出了一种宏压电纤维复合材料(macro fiber composite,简称MFC)致动的仿鲹科身体/尾鳍(body or caudal fin,简称BCF)水下推进器。利用搭建的实验平台测试了不同驱动电压条件下推进器的摆动性能,推进器在峰峰值为1000V,频率为17.7和3Hz的激励电压下分别取得空气中最大摆幅峰峰值为45mm,水下最大摆幅峰峰值13mm。借助计算流体力学(computational fluid dynamics,简称CFD)研究了仿生推进器在稳定摆动过程中流场特性和尾迹旋涡的分布情况,从推进器端部观察到的“反卡门涡街”结构揭示了仿生推进器的流体动力学机制和摆动式推进机理。推进器端部在x方向上的平均推进力可达1.5mN。研究成果对压电纤维致动器在仿生推进器的优化设计和提高其推进效率提供技术支持。
Fiber-based piezoelectric composites offer the advantages of excellent flexibility and geometric scalability in the applications of bio-inspired locomotion and flexible actuation.A biomimetic underwater propeller mimicking the body or caudal fin(BCF)oscillating behavior of carangidae fish is proposed,and macro fiber composites(MFC)are used as actuators.Oscillation performance of the propeller is presented at different actuation voltage levels.Experimental results show that the maximum oscillating displacement of the proposed propeller in air is 45mm(peak-to-peak value),with the actuation of 1000V(peak-topeak value)at 17.7Hz.The distributions of flow field and vortexes around the propeller tip in a steady oscillating cycle are obtained by the use of computational fluid dynamics(CFD)technologies.The anti-Karman vortex street phenomenon is revealed during the time sequence of vortices generation,expand,shed and breakdown processes.Meanwhile,ajet flow ejecting downstream the tip between the two counter-rotating vortices is observed.Accordingly,the propulsion locomotion of the propeller is achieved with the reactive force of the jet flow.Thus,the propulsion mechanism of the proposed biomimetic underwater propeller is demonstrated.The average propulsion force at the end of the propeller in the xdirection is up to 1.5mN.
作者
林煌旭
任枭荣
娄军强
贾振
LIN Huangxu;REN Xiaorong;LOU Junqiang;JIA Zhen(Faculty of Mechanical Engineering and Mechanics,Ningbo University Ningbo,315211,China;State Key Laboratory of Industrial Control Technology,Zhejiang University Hangzhou,310027,China)
出处
《振动.测试与诊断》
EI
CSCD
北大核心
2020年第5期881-887,1020,1021,共9页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51505238,51805276,61703217)
浙江省自然科学基金资助项目(LY20E050007)
宁波市自然科学基金资助项目(2019A610112)。
关键词
仿生水下推进器
宏压电纤维复合材料
身体/尾鳍谐振式推进
计算流体力学分析
反卡门涡街
biomimetic underwater propeller
macro fiber composites(MFC)
body or caudal fin(BCF)oscillating propulsion
computational fluid dynamics(CFD)analysis
anti-Karman vortex street