Research And Optimization Of The Hydrodynamic Characteristics Of The Point Absorber Wave Energy Converter

Economic growth is always accompanied by energy consumption.After the reform and opening up,China's economy has developed rapidly,but at the same time,energy has been excessively consumed.In order to achieve sustainable development,China has begun to focus on renewable energy sources such as solar energy and wind energy.The renewable energy utilization technology has been widely promoted.Compared with renewable resources such as wind and solar energy,wave energy resources have greater energy density and wider distribution,but the utilization technology of wave energy resources is still relatively backward.Wave power generation technology uses the motion of waves to generate electricity.It can provide high-quality renewable energy and alleviate energy shortages.In this paper,the hydrodynamic performance of point-absorbing wave power convrters is carried out,and a method of optimizing the shape of buoy based on time-domain model is presented.The main contents of the paper are as follows:Firstly,based on the theory of potential flow,the hydrodynamic forces acting on the buoy in waves are analyzed systematically.A hydrodynamic model of point-absorbing wave gingery converter is established by using ANSYS-AQWA.The hydrodynamic parameters of the device,including additional mass,radiation damping,wave excitation force and RAO,are calculated.The hydrodynamic parameters of buoys with different parameters(shape,diameter,draft water and barycenter coordinates)are compared.Secondly,a geometrical optimization method of a point absorber based on design of experiment(DOE)in time domain analysis is proposed.For a certain wave condition,the range of buoy size is defined.Then several groups of buoys are selected by the method of experimental design,and their responses in time domain are calculated.By analyzing the response parameters of the buoy,the optirmim geometric parameters are obtained.Then the influence of the array on the point absorber wave energy converter is discussed,and the optimal array mode is obtained.Then,the wave tank tests were carried out.According to the experimental conditions,several groups of incident waves under different wave conditions are set up.The displacement and pressure of the buoy are measured by displacement sensors and pressure sensors.The correctness of the model is proved by comparing the experimental and simulation results.At last,the mooring system was added to the fixed floating platform of the point absorber.The influence of different mooring parameters on the floating platform of the point absorber wave energy converter was studied.The optimal anchor chain diameter,the diameter of the mooring point and the wave incident angle were obtained.