Research On Hybrid Fluid Energy Harvesting Based On Triboelectric Nanogenerator And Electromagnetic Generator

Fluid energy is a kind of clean and renewable energy source.Under the pressure of fossil energy depletion and serious environmental pollution,the development of fluid energy is promising alternative.Fluid energy contains enormous energy,including the ubiquitous wind energy and the widely distributed wave energy.In order to fully harvest different forms of fluid energy,a wind energy harvester with built-in wind blades and a wave energy harvester with a non-inertial drive are designed for wind energy and wave energy,respectively.Under the same mechanical excitation,the TENG exhibits higher voltage characteristics and the EMG exhibits higher current characteristics.In order to make the fluid energy harvester with higher output power and wider application,a hybrid power generation method of the TENG and the EMG is used to design the fluid energy harvester.The research contents are shown as follows:1、Through electrostatic simulation,electromagnetic simulation and fluid simulation,a blade built-in hybrid wind energy harvester is designed.The harvester is composed of fluorinated ethylene propylene(FEP)film,grid flexible copper electrode,permanent magnets and coils.The specific work is shown as follows:(1)The blade built-in wind energy harvester consists of three parts: stator,rotor,and air inlet cover.The stator is attached with gridded copper electrodes and 24 coils.The rotor has4 pieces of FEP films and 24 magnetic interlaced permanent magnets.The rotor is rotated by the wind,the TENG unit with FEP film and gate copper electrode and the EMG unit with the coils and the permanent magnets generate electricity together.(2)Optimized the design of wind blades and air inlet cover,including the number of wind blades,blade pitch angle,wind blade solidity and the slenderness ratio of the air inlet cover,which effectively improved the wind energy utilization efficiency.The EMG unit is optimized,including the number of permanent magnets and the internal connection mode,which effectively improves the output of the EMG unit.(3)Matching impedance experiment was conducted at a routing speed of 8 rpm,the maximum peak power of the TENG unit reached 0.34 m W at an optimum load resistance of 300 MΩ,the maximum peak power of the EMG unit reached 6 m W at an optimal load resistance of 1 kΩ.2、Through electrostatic simulation,electromagnetic simulation and fluid simulation,a non-inertial driven hybrid wave energy harvester is designed.The harvester is composed of fluorinated ethylene propylene(FEP)film,nylon film,permanent magnets and coils.The specific work is shown as follows:(1)The non-inertial driven wave energy harvester includes two parts: a shell and a drive plate.The Z-shaped TENG is attached to the inner wall of the shell on one side and the side of the drive plate on the other side.A coil is attached to the inner bottom of the shell and a permanent magnet is attached to the bottom of the drive plate.The drive plate is swayed by the wave,the TENG unit consisting of the FEP and nylon with the copper electrodes and the EMG unit consisting of coils and permanent magnets generate electricity together.(2)Optimized selection of shell materials,including material stiffness,impact toughness,density and corrosion resistance,effectively increasing the service life of shell materials.Optimized design of the TENG unit,including the selection of different triboelectricity layers,triboelectricity layer thickness and sponge layer thickness,the output of the TENG unit is effectively improved.(3)Matching impedance experiments was conducted at a frequency of 1 Hz.The maximum peak power of the TENG unit reached 2.17 m W at an optimum load resistance of 70 MΩ,the maximum peak power of the EMG unit reached 5.72 m W at an optimal load resistance of 680 kΩ.A wind energy harvester and a wave energy harvester based on the TENG and the EMG are designed and manufactured,which can effectively convert fluid energy into electrical energy to power small electronic devices.Compared with previous fluid energy harvesters,the fluid energy harvester described in this work has a more compact structure,higher conversion efficiency and power output.The design of fluid energy harvesters is expected to solve the problems of energy crisis and environmental degradation,providing innovative ideas and a bright future for green energy supply.