Research On Wave Energy Harvesting Technology Based On TEN

The ocean contains rich natural energy resources and is an ideal source of clean and renewable energy.However,traditional large-scale electromagnetic generators for ocean energy collection have the disadvantage of low efficiency when collecting irregular and low-frequency ocean energy.The Triboelectric Nanogenerator(TENG)uses the basic principle of Maxwell displacement current and applies the principles of frictional electrification and electrostatic induction,opening up a new approach for ocean energy collection technology and exhibiting significant technical advantages in low-frequency ocean energy collection.Based on the TENG’s vertical contact-separation working mode,this thesis proposes a new type of Paper-based Arch-structure Triboelectric Nanogenerator(PA-TENG)that optimizes the rebound structure and reduces the system weight in material selection.The energy collection device designed in this thesis improves output performance and stability while reducing the cost of device production and maintenance.As a unit module,it is easy to integrate on a large scale in series and parallel.The experimental results show that the PA-TENG system can provide stable energy supply,laying a feasible technical foundation for large-scale ocean energy collection.The specific research contents of this thesis are as follows:(1)A vertical contact-separation mode PA-TENG software simulation model was established,and the V-Q-x equation relationship was derived using Gauss’s theorem and electrostatic induction theory.Based on a coupled model of wave excitation,overall device,and mass block in series,the energy conversion physical system of PA-TENG triboelectric nanogenerator and wave interaction was constructed to collect low-frequency ocean energy from various directions.By adding an arch structure and a mass slider,the system weight was greatly reduced compared to the traditional spring-slider structure,laying the foundation for large-scale integration of PA-TENG basic units.(2)To address the issue of the potential change pattern of the PA-TENG basic unit during motion,a three-dimensional model of the PA-TENG structure was established and simulated using the COMSOL Multiphysics software to investigate the electrostatic field theory.The potential change pattern during the electrode motion was monitored frame by frame through parameterized scanning.Simulation analysis was conducted to investigate the effects of separation distance,dielectric constant,and dielectric layer thickness on the system’s output.The results showed that the system’s output is proportional to the dielectric constant of the friction material,proportional to the separation distance of the electrodes,and inversely proportional to the thickness of the dielectric layer.Through simulation analysis,the operation pattern of Maxwell displacement current in the PA-TENG energy harvesting system was revealed,providing theoretical support for improving the output performance of the PA-TENG triboelectric nanogenerator.(3)A new type of PA-TENG was fabricated,which innovatively used paper and fluorinated ethylene propylene(FEP)film as friction materials and elastic film connections as arch support materials,achieving instantaneous separation after contact.The resonance characteristics of the system were improved by increasing the slider,which improved the system’s output performance.Based on this,the output performance influencing factors of the friction nanogenerator,such as the number of unit cells,device size,separation distance,and vibration frequency,were experimentally tested using the controlled variable method.The effects of each factor on open-circuit voltage,short-circuit current,and transferred charge were tested,verifying the validity of the theoretical analysis in Chapter 2.The maximum instantaneous output power density of the system was obtained by testing the load output characteristics of the PA-TENG,which was 11.85 m W/m~3.Through a water tank simulation experiment,the series-connected PA-TENG friction nanogenerator was placed in a water tank,and artificial waves with a frequency of 1 Hz were simulated to show that the system output was able to easily light up more than 40 LED lights,demonstrating the huge potential of PA-TENG technology in the field of large-scale ocean energy collection.