Experimental device and application method of vortex-induced vibration piezoelectric energy harvester in water flow

Abstract

The invention discloses an experimental device of a vortex-induced vibration piezoelectric energy harvester in water flow and a method for using the same. The experimental device includes an experimental platform and a piezoelectric energy harvester used in the experiment. The experimental platform includes structures such as tank supports, tanks, honeycombs, damping nets, drain baffles, water inlet pipes and return pipes. The water flows through the water inlet area, the experiment area and the water discharge area in turn from left to right. The water flow rate in the tank can be adjusted through the water inlet valve, return water valve and water discharge baffle to obtain a stable laminar flow field environment. The piezoelectric energy harvesting device introduces nonlinear magnetic force by embedding excited permanent magnets around the fluid in the cylinder, which can effectively increase the resonance bandwidth, that is, the range of resonance flow velocity, and can resonate in different flow velocity ranges, meeting the needs of experimental exploration. The invention is capable of effectively simulating the low-velocity stable laminar flow field, accurately adjusting the flow velocity, and simultaneously combining piezoelectric energy harvesting devices with various structures to measure various experimental data under different flow velocities.

Description

technical field [0001] The invention relates to an experimental device for vortex-induced vibration of a cylinder surrounding a fluid in a water flow and a method for using it, in particular to an experimental device for a piezoelectric energy harvester vortex-induced vibration that introduces a nonlinear magnetic force by embedding a permanent magnet in the fluid surrounding a cylinder and how to use it. Background technique [0002] With the sustained and rapid development of the economy and society, the demand for energy is increasing day by day, and non-renewable energy sources such as coal and oil are becoming exhausted, so it is essential to seek new energy sources and utilize renewable energy sources. As a renewable energy source in the environment, hydropower is abundant in reserves. In the face of high-speed water flow environment, hydropower stations can be built to use turbines to convert the kinetic energy of water flow into electrical energy, but the turbines h...

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Problems solved by technology

[0006] In 2004, pobering et al. used piezoelectric materials to make a piezoelectric power generation flag suitable for low-velocity water flow. Using the Karman vortex street generated by the principle of vortex-induced vibration, the power generation flag was bent to obtain electric energy. This device was placed in the river, and the water flow Electricity is generated when flowing through the device, but the energy conversion efficiency is low

However, the invention does not provide relevant experimental devices and experimental methods, and the design of the piezoelectric energy harvester is single, unable to adapt to various flow velocity environments, and unable to adjust experimental parameters, so it can only be applied to wind tunnel tests

[0009] The mechanism of vortex-induced vibration is very complicated, and for the vortex-induced vibration mechanism of piezoelectric energy harvesters in water flow, due to the effect of fluid-solid coupling, theoretical modeling calculations become more complicated

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