| Wave energy,as one of the most widely distributed and abundant energy sources in ocean energy,has received extensive attention from researchers.Triboelectric nanogenerator(TENG)can directly convert low-frequency wave energy into high-voltage,low-current electric energy with good conversion efficiency.It complements traditional electromagnetic generators in lowfrequency energy utilization technology.With the wide application of ocean self-driven sensors,the small energy consumption makes it possible to combine wave energy conversion devices with TENG to provide power for ocean sensors.In this thesis,a center-pipe oscillating water column wave energy TENG device is designed by integrating center-pipe wave energy conversion technology with Contact-sliding TENG technology.The working principle analysis,numerical modeling,semi-physical simulation experiment,and wave tank experiment are conducted.The main research content includes:(1)The structural characteristics and geometric parameters of the center-pipe wave energy TENG device were designed.The device’s working process is introduced,motion equations are established,and power generation principle is theoretically derived and analyzed.(2)The hydrodynamic modeling simulation of the center-pipe wave energy TENG device is carried out.The influences of the shape of the floater’s bottom and the structure parameters of the oscillating plate on the hydrodynamics of the device is analyzed.The electric field simulation of the TENG power generation process are also conducted to intuitively understand the spatial potential distribution of the TENG electrode’s motion in one cycle and analyze its influencing factors.(3)A semi-physical experimental platform is built to optimize the electrode parameters and analyze the overall performance.In the electrode parameter optimization experiment,the electrical output performance of different dielectric materials,different dielectric material thicknesses,and different electrode angles is compared by control variate method.The material durability is also tested.An impluse wave energy TENG is designed and manufactured to conduct a single-wind direction semi-physical simulation experiment to study the electrical output performance under different wind speeds and conduct a capacitor charging experiment.(4)A wave tank experiment of the center-pipe oscillating water column wave energy TENG device is carried out under four different regular wave conditions with different periods and height,as well as an irregular wave condition.It is found that the electrical output performance of the device is related to the wave period and wave height.Under the experimental conditions of a wave period of 2.5 s and a wave height of 0.12 m,a 1000 μF capacitor is charged,and after running for296 s,the capacitor is charged to 1.5 V and successfully drives an electronic digital temperature display.The device directly drove 33 LEDs.The feasibility of the center-pipe wave energy TENG device for collecting low-frequency wave energy and providing power for small ocean monitoring instruments and sensors is verified. |
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