The Design And Numerical Simulation Of A Vertical Axis Planar Ocean Current Power Generation Model

With the development of the economy,the increase of population,and the continuous improvement of the standard of living,people's demand for energy has grown rapidly.In the current energy structure,the main energy sources used in China at this stage are fossil fuels such as oil,natural gas and coal.These fuels are non-renewable energy sources.The heavy use of fossil fuels has led to their depletion on the one hand and serious environmental problems on the other.China is a country with abundant marine resources.Ocean current can be used as a clean renewable energy source with wide distribution,large reserves and no pollution.Therefore,how to use ocean currents for clean and sustainable power generation has become the focus of research in countries around the world.As the core equipment of ocean energy energy conversion,the turbine is designed as a vertical axis multi-blade turbine.In the dissertation,its hydrodynamic performance of the blade and the turbine is studied in the flow field.Firstly,based on the existing research on hydraulic turbines,the advantages of vertical axis turbines are summarized.The structural characteristics and working principle are introduced.The hydraulic forces of the turbine blades and the whole impeller are analyzed respectively.The Bezi theoretical model related to dynamic performance calculation and the dual-disc multi-flow management theory model are introduced.Then,a physical model is established for the blade airfoil of the turbine,and the constant value simulation of the airfoil under different flow field conditions is carried out.The flow characteristics of the blade airfoil at different angles of attack and different flow rates are studied.Subsequently,the whole of the turbine and the water tank is taken as a numerical simulation model.In the research process,the influence of the rotating shaft and the beam on the flow field distribution is neglected,and the whole model is simplified into a two-dimensional model.The simplified model is unsteady two-dimensional.Numerical simulations are carried out to study the influence of three influencing factors,such as the inflow velocity,the impeller rotation speed and the number of turbine blades,on the hydrodynamic performance of the turbine.Finally,three sets of different sizes of turbines were used to verify the experiment.Based on the experimental data,the energy utilization rate of the turbine was calculated and analyzed.The feasibility and application of power generation with variable angle of attack vertical axis multi-blade turbine was carried out.Through the research in the paper,the flow field distribution around the blade airfoil and the flow of the fluid in the flow field of the turbine can be simulated.The influence of some basic parameters of the turbine on its hydrodynamic performance is obtained.The structure of the turbine was verified,which laid the foundation for the optimization of turbine parameters and structure.