气动系统已广泛应用于工业生产中, 其工作时排出的气体直接进入大气, 因而浪费了大量的能量。该文以聚偏二氟乙烯(PVDF)压电片作为能量收集器核心部件, 对排出的压缩气体进行了能量收集。设计了多悬臂梁振动能量收集器, 利用ANSYS有限元仿真软件分析了压缩气体进入能量收集器后的流场, 通过试验测试了压电片发电效果。结果表明, 入射口直径、扰流柱直径、入射口压力和入射口距扰流柱距离都会影响压电片发电效果。当入射口压力为80 kPa,负载电阻为900 kΩ时, 能量收集器总功率约为120.64 μW, 与其他收集器相比提高了28.8%。

The pneumatic system is widely used in industrial production. When it works, the exhaust gas is directly passed into the atmosphere, resulting in wasting a large amount of energy. In this paper, the polyvinylidene fluoride (PVDF) piezoelectric plate is used as the core component of energy harvester to collect energy from the discharged compressed gas. A vibration energy harvester with multi-cantilever beam was designed, and the flow field of compressed gas entering the energy harvester was analyzed by ANSYS finite element simulation software, the power generation effect of piezoelectric plate was tested experimentally. The results show that the diameter of the incident port, the diameter of the spoiler column, the pressure of the incident port and the distance between the incident port and the spoiler column all affect the power generation effect of the piezoelectric plate. When the incident port pressure is 80 kPa and the load resistance is 900 kΩ, the total power of the energy harvester is up to 120.64 μW, which is 28.8% higher than that of other harvesters.