The Optimization Of Coupling Effect Between Vane And Fairing In Vertical Shaft Turbine

In recent years,the development of China's ocean energy is in the golden stage of rapid development,and its development and utilization is in an unprecedented period of strategic development opportunities.Therefore,grasping the current opportunity is erucial to promoting the development of ocean energy.Among them,the tidal current energy conversion device is the most important thing in the development of ocean energy.The research object of this paper is one of the devices that have been widely studied.In this paper,the computational fluid dynamics simulation,ie CFD simulation analysis,is mainly used to analyze the fluid performance of the turbine's diversion hood,and optimize the parameters in the device to improve the output efficiency of the whole system.The main research results are as follows:(1)Comparing different types of turbine impellers,the optimized Savonius turbine is selected,and its structure is a secondary Bezier function double-blade impeller.The slope and crown are both 5/6,and the optimal tip speed ratio coefficient is At 1.4,the power factor is 0.32911.(2)According to the formula of turbine capacity,a eurrent-accelerated diversion hood that can increase the flow velocity of water impinging on the turbine impeller is designed,and a series of optimizable parameters including rotary inner diameter,nozzle width,nozzle length and inclination angle are designed.(3)Through a series of orthogonal test optimization,the parameter combination of the two nozzle diversion hood with the highest power coefficient of the turbine is obtained.With the addition of this diversion hood,the turbine power factor is increased to 0.44286,which is a factor of 34.56%higher than that of a turbine without it.(4)Using the orthogonal test,the optimal parameter combination of the four-nozzle diversion hood is obtained.The power coefficient of the turbine with the diversion hood is 0.45056.Compared with the turbine without it,the power factor is increased by 36.90%,but the power factor is ouly increased by 1.74%compared to a turbine equipped with a two-nozzle diversion hood.(5)Model tests were carried out on a tidal power generation simulator test rig.The test results show that the addition of the diversion hood to the selected impeller can effectively improve the energy-receiving efficiency and verify the calculation results of the simulation part.