Structure Design And Aerodynamic Characteristics Analysis Of Wind-gathering Power Plant Under Low Wind Speed Environment

With the progress of socio-economic and industrial development,the needs for clean power and regenerative power are expanding,and wind power,as one of the clean and environmental friendly alternatives,has wide distribution,large storage capacity,low pollution,and unique characteristics of natural and economic benefits.At present,wind power generation devices on the market have high requirements for wind power.Generally,wind power is required to reach level 4,i.e.5.5～7.9m/s or above,in order to drive the blades of the wind turbine to rotate and generate electricity,which will cause a waste of wind resources below level 4.The local city where we live is a typical area with wind level four or lower,and also a densely populated area with a large power demand.Therefore,the use of breeze power generation in the urban area will effectively solve the regional limitation and high cost of wind power generation.In order to improve the problem that wind turbines cannot start at low wind velocities and have low wind turbine output,the thesis proposes that wind turbine power generation devices in a wind collection environment use wind collection devices to direct airflow by changing ducts to reduce airflow losses at the tip of the leaves and significantly increase the speed to the tip of the leaves,thus increasing the static start and output of the wind turbine across the board.Firstly,this paper studies the acceleration principle of the contraction and expansion coupling structure,the import length Angle of the cluster,the Angle of the outlet length Angle,the speed cloud graph and the pressure cloud map through the fluent fluid analysis software,and the optimal size is obtained by analyzing the cloud map.Secondly,according to the basic aerodynamic theory for blade selection and aerodynamic analysis,the final selected blade shape is SD7062,identify the turbine blade characteristics,including fan blade the diameter D,blade tip speed ratio λ,blade number B,design angle of attack a,and each segment chord length C and torsion angle θ.Finally,based on CFD control equations and numerical simulations,the comparison of the performance of the impellers in the wind field with and without the wind aggregation mechanism was investigated.The results of the contrast reveal that the wind speed after the wind turbine is conducive to the increase of the rotor performance.