流致涡激振动压电发电风能采集技术模拟研究

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摘要为了实现风能驱动压电能量采集器振动发电，给野外生态环境检测传感器长期供能。研究流致涡激振动将层流风能转换为高频振动，提高压电发电效率。基于ANSYS流场分析的CFD数值仿真分析软件建立涡激振动尾流区域流场压电俘能发电模型。设置多个流场激振特性监测点，分析流经钝体产生的涡街脱落尾流区空气压强，模拟波动气压驱动压电振动发电输出特性。采用三种钝体结构分析不同风速作用下钝体尾流区域漩涡脱落特性，研究钝体尾流区压力变化情况，优化系统气流动态特性，获取最佳能量采集区域。将涡激振动引起的波动空气流场与聚偏氟乙烯（PVDF）压电薄膜结构结合，分析流致涡激压电薄膜振动变形特性与和输出电能。结果表明：尾流区域各点振动强度存在较大差别；风速增加，涡激振动频率增显著加；三角形钝体尾流区涡激振动强度较高，压电发电输出能量提高。
关键词：风能；涡激振动；压电能采集；PVDF；自供能

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关键词 ：风能, 涡激振动, 压电能采集, PVDF, 自供能

Abstract：Piezoelectric energy harvester (PEH) from wind energy is promising to provide long-term electric power for ecological environment monitoring sensors. In order to improve the output efficiency of piezoelectric power generation, vortex-induced vibration (VIV) is used to transform laminar airflow into high-frequency vibration. The ANSYS CFD numerical simulation model is established to analyze the wake flow field of VIV and PEH devices. Several monitoring points of flow field excitation characteristics were set up to analyze the air pressure generated by vortex street shedding from the wake region downstream of the blunt body. Meanwhile, the output characteristics of piezoelectric vibration excited by fluctuating pressure were simulated. Three kinds of bluff body shapes were used to evaluate vortex shedding strength in the wake area with the various wind speeds. The air pressure is discussed to explore the optimum area for energy harvesting. The airflow vortex-induced PVDF（Polyvinylidene fluoride）piezoelectric film deforms to generate electric power. The results show that the vibration intensity varies greatly in the wake region. Furthermore, it is higher with the triangular bluff body. The vortex-induced vibration frequency increases with the increase of wind speed. Meanwhile, the piezoelectric generation power is improved significantly.
Keywords: wind energy; vortex vibration; piezoelectric energy harvesting; PVDF; self-power

Key words： wind energy vortex vibration piezoelectric energy harvesting PVDF self-power

收稿日期: 2021-09-17 出版日期: 2022-12-15

引用本文:

杜小振，P.A.Mbango-Ngoma，常恒，张咪，王宇. 流致涡激振动压电发电风能采集技术模拟研究[J]. 振动与冲击, 2022, 41(23): 168-174.
DU Xiaozhen, Mbango-Ngoma, P.A., CHANG Heng, ZHANG Mi, WANG Yu. Wind energy collection technology simulation with flow-induced VIV piezoelectric film for power generation. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(23): 168-174.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I23/168

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