Dynamics and energy harvesting of a flow-induced snapping sheet with nonuniform stiffness distribution  

作　　者：Zhaokun Wang Jingyu Cui Fuwang Zhao M.N.Mumtaz Qadri Yuanye Zhou Hui Tang 

机构地区：[1]Department of Mechanical Engineering,The Hong Kong Polytechnic University,Kowloon,Hong Kong,China [2]School of Fashion and Textiles,The Hong Kong Polytechnic University,Kowloon,Hong Kong,China [3]Zhejiang Key Laboratory of Multiphase Flow and Fluid Machinery,Zhejiang Sci-Tech University,Hangzhou 310018,China [4]Department of Aerospace Engineering,School of Mechanical and Manufacturing Engineering,NUST,Islamabad 44000,Pakistan [5]Shenzhen Research Institute of Shandong University,A301 Virtual University Park in South District of Shenzhen,Shenzhen,China

出　　处：《International Journal of Fluid Engineering》2024年第4期44-55,共12页国际流体工程(英文)

摘　　要：Energy harvesting through periodic snap-through of a buckled sheet has recently gained considerable attention because of its potential applications in energy harvesting in low incoming flow.Although the snapping dynamics of uniform buckled sheets has been extensively studied,the present work focuses on the energy harvesting and dynamics of a nonuniform snapping sheet with both of its ends clamped in a channel flow.The analysis reveals that the sheet undergoes periodic snap-through oscillations,with its rear half consistently serving as the main contributor to effective energy harvesting,and the potential energy contributing significantly more than the kinetic energy.Varying the stiffness differenceΔEI^(*)shows that increasing the stiffness of the rear part and decreasing that of the fore part shifts the deformation wave toward upstream and enhances the snapping amplitude of the fore part,optimizing energy extraction.At a length compression ratioΔL^(*)=0.3,the maximum potential energy is observed forΔEI^(*)=1,and the total energy peaks atΔEI^(*)=2.The study also identifies an optimalΔL^(*)=0.4that maximizes both total and potential energies,and triples the potential energy in comparison withΔL^(*)=0.1.However,the enhancement of nonuniformity disappears atΔL^(*)>0.3 for the total energy andΔL^(*)>0.2 for the potential energy.These findings provide insights to aid optimization of the design and performance of snapping sheet energy harvesters.

关 键 词：STIFFNESS ENERGY HARVESTING 

分 类 号：TB301[一般工业技术—材料科学与工程]