In order to solve the problem of continuous energy supply of underwater sensors,a nested circular tube piezoelectric energy harvesting structure based on flow-induced vibration was designed.By establishing a fluid-structure-electric coupling model and conducting numerical simulations,the effects of the working mode,shape,support structure,flow velocity,and the distance between the bluff body and the energy harvesting structure's center on the vibration and piezoelectric performance of the piezoelectric material were studied.The results show that the structure can generate vibrations in both transverse and longitudinal flow directions,with the highest open-circuit voltage of the piezoelectric material observed under the shear mode(d15).The piezoelectric performance is optimal when two energy harvesting structures are arranged in tandem in the longitudinal flow direction.When the flow velocity is 1.1 m/s and the center distance is 3 times of the diameter of the tube,the maximum voltages of the upstream and downstream energy harvesting structures are 48.22 V and 52.47 V,respectively,which are 4.05 and 4.41 times to the output voltage of a single energy harvesting structure.The effectiveness of the piezoelectric energy harvesting structure in converting vibration energy into electrical energy was validated in the water circulation experiments.
关键词
流致振动/压电能量收集/剪切模式/数值模拟
Key words
flow-induced vibration/piezoelectric energy harvesting/shear mode/numerical simulation
维普
万方数据