基于涡致振动的压电能量收集阵列的仿真与实验

Simulation and Experiment on Piezoelectric Energy Harvester Array Based on Vortex-Induced Vibration

为了解决部分微电子设备供电需求大,而单一的压电能量收集结构无法满足的问题,该文对基于涡致振动的压电能量收集阵列进行流-固-电耦合仿真,并与风洞实验数据进行对比。首先对前置阻流体的俘能结构进行测试,验证结构的可行性,然后对串列、并列、错列、长方阵型的压电俘能结构进行研究。仿真与实验结果表明,压电能量收集阵列随风速的增大呈现整体增大的趋势,随间距的增大呈现先增大后减小的变化趋势,前置阻流体的俘能结构直径D=0.02 m,在风速为6 m/s,中心距L=5D的条件下,输出电压峰值为4.35 V,长方阵型的发电性能最优;在风速为6.5 m/s,L=1.5D时,电压峰值为9.98 V。结果表明,压电能量收集阵列具有一定的优势,为涡致振动压电能量收集的研究提供了参考。

In order to solve the problem that the single piezoelectric energy harvester cannot meet the large power supply demand of some microelectronic devices,the fluid-solid-electrical coupling simulation of piezoelectric energy harvester array based on vortex-induced vibration was carried out in this paper,and the simulation results were compared with the wind tunnel experimental data.Firstly,the energy harvester structure of the front choke was tested to verify its feasibility,and then the piezoelectric energy harvester structure in series,parallel,staggered and rectangular arrays were studied.The simulation and experimental results showed that the piezoelectric energy harvester array increased as a whole with the increase of wind speed,and increased at first and then decreased with the increase of spacing.The diameter D of the energy harvester of the front choke was 0.02 m,and the peak output voltage was 4.35 V when the wind speed was 6 m/s and the center distance was L=5D,the rectangular array had the best power generation performance,and the peak output voltage was 9.98 V when the wind speed was 6.5 m/s and the center distance is L=1.5D.The results indicated that the piezoelectric energy harvester array had certain advantages over the single piezoelectric energy harvester,which provided a reference for the research of piezoelectric energy harvesting based on vortex-induced vibration.