密闭环境气流冲击式压电阵列发电性能实验研究

Experimental Research for Piezoelectric Array Performance Induced by Air Impact in Sealed Environment

为实现高压密闭环境的气体能量收集并提高能量转化效率,提出了一种气流冲击式压电阵列发电机。利用压电材料的正压电效应并结合压电本构方程对压电发电机理进行分析,结果表明在高压气体环境下可采用盘型压电片进行气体能量收集,且压电片外圆周需进行机械夹紧固定。设计并制作了一种压电发电阵列实验样机,搭建了实验测试系统。以高压气体为激励源对不同流量、周期及负载条件的改变进行了实验测试。实验结果表明,峰值电压与流量成正比,随着周期的增加峰值电压有小幅度的增长趋势,压电阵列在电学并联的情况下具有最佳的功率输出性能,当周期为0.8 s、流量为200 L/min、压力为0.3 MPa时最佳的输出功率是0.99 mW。

A piezoelectric array energy harvester is proposed to transform and improve the energy efficiency of the compressed air energy in sealed environment. The characteristic of the piezoelectric energy harvester is analyzed, combined with the direct piezoelectric effect and the piezoelectric constitutive equations. The analysis result shows that the piezoelectric plate is suitable for energy harvesting in high pressure air condition. The piezoelectric plate is fixed on the basement, and is clamped by the mechanical. A coupling piezoelectric array energy harvester is designed and the test system is built. The experiment is tested by changing flow, cycle and load resistance under high pressure air. The experiment results show that the peak voltage increases with the flow increasing. The peak voltage increases slowly with the cycle increasing. The piezoelectric array has the optimal output result in parallel connection condition. The optimal output power is 0.99 mW under the condition of 0.8 s, 200 L/min and 0.3 MPa.