Design Optimization And Hydrodynamic Performance Study Of Wave Energy Power Supply Device For Mooring Platform

It is an important cornerstone of China’s ocean power construction to understand,manage and plan the ocean.And the core issue is ocean informatization.The development of marine instrument is an important way to improve the degree of ocean informatization in China.Marine instruments can be mounted on mooring platform,however,due to the limitations of marine conditions and technology,energy supply has become a bottleneck problem restricting the wide-scale promotion and long-term stable operation of marine instruments.The main way to solve this problem is to exploit and utilize ocean energy.In this paper,in combination with the national renewable energy development strategy,an improved oscillating float buoy wave power supply device which can be integrated on mooring platform is developed based on classical ones.And its feasibility is proved by numerical simulation.This thesis consists of five chapters.The first chapter is an introduction.The background and significance of the subject are described primarily.Then,the research progress of wave energy generation technology is introduced from the aspects of development history,device type and future direction.The domestic and international status of oscillating float wave energy generation device is also described in detail.The second chapter is the structure design of wave energy power supply device for mooring platform.Firstly,the modification requirement of mooring platform for wave power supply device is introduced,and the diameter of wave buoy is determined.Then,according to the size and installation space of wave buoy,the structure composition and form are determined.Structural designs of wave buoy,guide post and connecting flanges etc.are carried out,drawings of each part are completed,and finite element analysis for main structures is down to ensure the reliability of the device.Chapter Three introduces the theoretical model of numerical wave flume,including the governing equation of wave motion,turbulence model,boundary and initial conditions,VOF method,discretization and solution of governing equation,etc.In the fourth chapter,the influence of three columns of mooring platform on the hydrodynamic performance of wave buoy is studied.Firstly,the simplified models of numerical flume,columns and wave buoy are established,then the boundary and initial conditions are set up and meshing is done.Four situations are simulated.One is without columns and the other three are with columns under different angles of incoming wave.Results show that the existence of columns disturb the flow field around the wave buoy greatly,but do not weaken the heave motion of the buoy,therefore do not affect the power generation performance of the wave energy device.In the fifth chapter,the parameters of wave buoy and its hydrodynamic performance are analyzed.Firstly,ANSYS-Aqua is used to calculate the typical wave buoy in frequency and time domain.The relation between RAO,additional mass,additional damping,wave force and the wave frequency,and the variation of the buoy displacement with time are analyzed.Secondly,the effects of parameters such as diameter,draft depth,half-apex angle,bottom shape and height-diameter ratio on hydrodynamic performance of the wave buoy are studied,which provides a reference for buoy shape optimization.The last chapter summarizes the whole paper and puts forward the future research prospect.In this paper,the wave energy power supply device of mooring platform is developed.The feasibility is verified by simulation,and the shape parameters and hydrodynamic performance of the wave buoy are studied,which provides a theoretical basis for the application of wave energy generators on mooring platform.