基于涡激振动的压电能量收集特性数值研究  

Numerical Investigation of Piezoelectric Energy Harvester characteristics based on Vortex-induced Vibration

作　　者：王军雷[1] 冉景煜[1] 丁林[1] 张敏[2] 张力[1] 

机构地区：[1]低品位能源利用技术及系统教育部重点实验室(重庆大学),重庆400030 [2]重庆交通大学航海学院,重庆400044

出　　处：《工程热物理学报》2015年第2期330-334,共5页Journal of Engineering Thermophysics

基　　金：高等学校博士学科点专项科研基金(No.20120191130003);新型微纳器件与系统技术国家中点实验室基金资助项目(No.2009MS04)

摘　　要：本文设计了一种基于涡激振动的流体动能收集装置。该器件主要包括钝体和PVDF(Polyvinylidene Fluoride)压电悬臂梁,涡街的交替脱落引起梁发生振动,通过压电效应将振动能量转为电能.基于流固耦合计算对该结构压电能量收集特性,以及压电悬臂梁的升阻力系数、振幅和频率等特性进行了数值分析,并着重研究圆柱型钝体与PVDF压电悬臂梁的位置对装置发电效率的影响。结果表明,圆柱与悬臂梁直接相连(即L=0.5D)会得到较高电压输出,在雷诺数Re=6000时,振幅峰值为A=0.97D,输出电压峰值达到0.923V。A flow energy harvesting device basing on vortex-induced vibration was designed in present work.The device mainly includes a bluff body and piezoelectric beam made of PVDF(Polyvinylidene Fluoride).The vortex shedding leads to the vibration of the beam and the vibrational energy transfers to electric power by considering piezoelectric effect.The numerical analysis has been taken to study the fluid-structure interaction.The lift coefficient,vibrational amplitude and frequency of the piezoelectric beam have been gotten.The position effect of the bluff body and the piezoelectric beam on the efficiency of energy harvesting has been discussed.It can be concluded that high voltage output can be obtained if the circular cylinder and the piezoelectric beam are linked together(L = 0.5D).When Re=6000,the peak value of vibrational amplitude was get A = 0.97 D,and the peak value of the voltage output is 0.923 V.

关 键 词：能量收集 压电效应 流固耦合 大变形 

分 类 号：TM619[电气工程—电力系统及自动化]