Research Of Wind Energy Harvesting Based On Triboelectric Nanogenerator And Application In Wind Speed Measurement

In recent years,Triboelectric nanogenerator(TENG)has shown great potential in the collection and utilization of low frequency and low amplitude mechanical energy.In this paper,we carried out the innovative research on wind TENG and wind speed measurement.Poly Tetra Fluoroethylene(PTFE)and Al are selected as the corresponding friction layer materials.We proposed a trapezoidal Wind-TENG based on vertical contact-separation operation mode,and we measure the open-circuit voltage,short-circuit current and power of the device.Moreover,a wind speed measurement method is proposed based on the wind TENG.The wind speed measurement is realized through data acquisition and processing of Labview software.Based on this method,wind speed sensing and wind direction detection can be realized.The trapezoidal structure has three obvious advantages: 1.The trapezoidal structure with narrow front and wide back increases the friction area between the friction layers;2.The pressure difference between the two sides of the trapezoidal makes it possible to realize wind direction detection while wind direction measurement;3.The device contains two TENGs,which increases the energy collection efficiency.1.Modeling and analysis of triboelectric nanogenerator for wind power harvesting.The principle of the device is simulated by finite element software,triboelectric equation and model simulation.On this basis,a trapezoidal Wind-TENG is designed,including two aspects of structure design and material selection.The Wind-TENG consists of two independent TENGs,which are designed to enhance its energy harvesting capability.Moreover,we analyze the flutter behavior of the film based on the film flutter theory,so as to further analyze the factors that affect the power generation performance of the device.2.Exploration of the preparation technology of trapezoidal Wind-TENG and the electrical performance test of the trapezoidal Wind-TENG.By sputtering technique,we sputter Al films with a thickness of about 150 nm on PTFE and Kapton films to obtain the friction layer films attached to the electrode layer.The maximum open-circuit voltage and shortcircuit current of the device are 298V/302 V and 32.89μA/33.07μA,respectively.And the maximum output power of TENG1 is 1.2m W and the power density is 0.5W/m2 under the condition that the external load resistance is 10MΩ.We also investigate the device’s selfpower capability at the wind speed of 15m/s,and the experimental results show that a single TENG in the device can light up 50 commercial LEDs under this condition.Moreover,we also design an experiment to verify the stability of the device.We find that the electrical properties of the device do not change significantly after four hours of continuous external wind blowing,which demonstrate the device’s good feasibility and practicability.3.Moreover,we propose a self-powered wind speed measurement method based on trapezoidal Wind-TENG.Through this measurement method we can realize a wind speed sensor.The whole method can be divided into two parts: data acquisition and processing and signal conversion.we collected current signal can be converted into the corresponding wind speed signal by designing the corresponding Labview software program.According to Bernoulli principle,we also propose the application of the sensor in wind direction determination.The sensitivity of the self-powered wind speed sensor is as high as 1.79μA/(m/s)in the range of wind speed 12m/s-25m/s.