Analysis And Optimization Of Hydrodynamic Performance Of Combined Wave And Current Power Generation Device

The disadvantages of fossil energy are obvious,the energy efficiency is low,the pollution is serious,and the fossil energy is drying up day by day in recent years.The problem of energy supply is prominent,therefore,increasing the proportion of clean energy is the trend,and people pay more attention to the development of new energy.The ocean,which accounts for 71%of the earth's surface area,is rich in energy.So the development and research of marine energy has become the main direction of energy research in the world nowadays.Many wave energy and current energy generation devices have emerged in endlessly.Currently,most of the marine energy installations are independent and inefficient,so how to improve the efficiency and reliability of energy utilization has become a key issue in the research and development of offshore power generation devices.Therefore,a new wave-flow combined generator composed of OPT oscillating buoy and Gorlov spiral turbine is proposed,which mainly focuses on the hydrodynamic performance of wave-current combined power generation device.The working principle,technical features and theoretical research methods of the present marine multi-energy complementary devices are summarized by consulting relevant domestic and foreign literatures.Based on CFD(Computational Fluid Dynamics)theory and STAR-CCM+software,the 3D numerical method of oscillating buoy and spiral turbine is established by using overlapping grid technology and dynamic body driving technology,and the verification of grid independence and the verification between model test and numerical model are carried out.By using the numerical simulation method,the influence of environmental parameters on the single energy utilization device is studied,and the combined effect of wave and flow on the hydrodynamic performance of oscillating buoy and spiral turbine is analyzed.Then,based on the above method,the full 3D numerical simulation of the wave-current combined power generation device is carried out,by analyzing the hydrodynamic characteristics and the flow field characteristics,the coupling effects of the two energy capture devices are obtained.And the influence of three important structural parameters,the diameter of the spiral turbine,the diameter of the oscillating buoy and the distance between them,on the total power and the total thrust of the device are established through a large number of numerical simulations.Based on the multi-objective PSO algorithm,the structure parameters of the device are optimized by using MATLAB language programming,and the optimal structure parameters are determined and verified by CFD.A complete method of hydrodynamic calculation and optimization of wave-current combined power generation device is summarized.