风向自适应型涡激振动压电俘能器的试验研究

Experimental Study of Orientation Adaptive Piezoelectric Energy Harvester Based on Vortex Induced Vibration

风能在自然界中是一种储量丰富、可持续利用的清洁能源。利用压电俘能器将风能转换为电能代替传统化学电池为低功耗电子设备持续供电已经获得了国内外学术和工业领域的认可。针对自然环境中风场的风向和速度时变特点,提出一种新颖的风向自适应型涡激振动压电俘能器。本俘能器可以根据风向的变化,自主调节迎风角度,从而使得俘能器能够在不同方向来风激励时拥有良好的输出性能。其主要由两个L型压电俘能梁、轴承底座、旋转固定座、导向翼等部分组成。通过搭建的小型风洞测试系统,对俘能器样机进行了测试和分析:受不同方向来风激励时,俘能器的输出功率绝对积分面积的平均相对偏差不大于6.1%;俘能器的风向自适应开启状态相对关闭状态,两个压电俘能梁的输出功率绝对积分面积平均值分别提升了468.2%和492.3%。自适应型压电俘能器的研究结果对提高俘能器的环境适应能力和增强输出性能有良好的参考价值。

Wind energy is a kind of clean energy with rich reserves and sustainable utilization in nature.It has been recognized in domestic and foreign academic and industrial fields that piezoelectric energy harvester(PEH)can take place traditional chemical battery to continuously supply power for low-power electronic equipment.For overcoming the time-varying characteristics of wind direction and velocity in nature,a novel orientation adaptive piezoelectric energy harvester based on vortex-induced vibration is proposed.The energy harvester can autonomously adjust the windward angle according to the change of wind direction.It mainly composes two L-shaped parts(EH1,EH2),bearing base,rotating fixed seat,and guide wing.And the prototype of the energy harvester is tested and analyzed:when excited by wind from different directions,γis no more than 6.1%;Comparing close state of orientation adaptive,SAVG of open state is increased by 468.2%and 492.3%for EH1 and EH2 respectively.The results of the proposed orientation adaptive PEH have a good reference value for improving the environmental adaptability and output performance of harvesters.