Abstract
According to the engineering phenomenon of the galloping of ice-coated transmission lines at certain wind speeds, this paper proposes a novel type of energy harvester based on the galloping of a flexible structure. It uses the tension generated by the galloping structure to cause periodic strain on the piezoelectric cantilever beam, which is highly efficient for converting wind energy into electricity. On this basis, a physical model of fluid–structure interaction is established, and the Reynolds-averaged Navier–Stokes equation and SST K -ω turbulent model based on ANSYS Fluent are used to carry out a two-dimensional steady computational fluid dynamics (CFD) numerical simulation. First, the CFD technology under different grid densities and time steps is verified. CFD numerical simulation technology is used to simulate the physical model of the energy harvester, and the effect of wind speed on the lateral displacement and aerodynamic force of the flexible structure is analyzed. In addition, this paper also carries out a parameterized study on the influence of the harvester’s behavior, through the wind tunnel test, focusing on the voltage and electric power output efficiency. The harvester has a maximum output power of 119.7 μW/mm3 at the optimal resistance value of 200 KΩ at a wind speed of 10 m/s. The research results provide certain guidance for the design of a high-efficiency harvester with a square aerodynamic shape and a flexible bluff body.
Highlights
In recent years, the environmental problems caused by the burning of fossil fuels such as petroleum and coal have become more and more serious, and fossil energy is increasingly depleted
Previous studies have shown that vortices may be generated alternately from the two side surfaces of a bluff body that is immersed in the flow, which results in the phenomenon of flow-induced motion (FIM) [2]
FIM may endanger the safety of structures, it can be potentially exploited for collecting energy from the environment [3]
Summary
The environmental problems caused by the burning of fossil fuels such as petroleum and coal have become more and more serious, and fossil energy is increasingly depleted. It is an important research focus to obtain clean and renewable energy from the environment [1]. FIM may endanger the safety of structures, it can be potentially exploited for collecting energy from the environment [3]. To this end, various energy harvesters and technologies have been developed. It is expected that such environmental energy harvesters can be utilized in practices to power micro-electromechanical systems (MEMS) and wireless sensor systems so that a more convenient realization of structural health monitoring, industry sense and detection, military track, and environmental monitoring [4] can be achieved
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