Aerodynamic Performance Research And Optimization Of Vertical Axis Wind Turbine With Side Gather Wind

Vertical axis wind turbines have received extensive attention due to their advantages of simple structure,low noise,no need for yaw,and suitable for complex and variable flow environment.However,compared with horizontal axis wind turbines,there are still some disadvantages such as poor startup and low utilization coefficient of wind energy.Therefore,the researchers put forward various kinds of wind gathering devices and application programs.However,although the performance of the wind turbine is improved,the complexity of the device structure and the manufacturing cost are increased,and the advantages of simple structure and high safety and stability are weakened.In this paper,a side wind vertical axis wind turbine is proposed to improve the utilization coefficient of wind energy and aerodynamic performance.Based on computational fluid dynamics,this paper analyzes some influencing factors in the process of vertical axis wind turbine numerical simulation,summarizes them.A numerical model is established and grid independence and time step independence test are carried out.Then,the aerodynamic performance of vertical axis wind turbine is improved and the structure of vertical axis wind turbine is optimized by numerical simulation.The paper simulates the operation of the wind turbine with different X distance,Y distance and installation angle when the deflector is installed in different X distance,Y distance and angle from the vertical axis wind turbine.Then,based on the optimal installation method,the influence of the compactness on the aerodynamic performance of the wind turbine is studied.Finally,the experimental test is carried out to verify the correctness of the numerical simulation.The results show that the performance of the vertical axis wind turbine is best when the structure parameters of the deflector are unchanged at 90°and installed at X/R=0 and Y/H=0,and the maximum CP is 0.314 when the tip speed ratio is 2,which is 48.8% higher than that without the baffle plate 0.211.The performance of the two blade wind turbine is the best when the chord length of the blade is not changed under the condition of side wind concentration.But considering the stability of the structure and the range of the tip speed ratio,the three blade is the most reasonable.In a certain range,reducing the chord length of blade will lead to the decrease of the maximum CP value and the increase of the optimal tip speed ratio.However,when the chord length is 0.030 m,the optimal tip speed ratio will decrease to 0.8 and the CP will be very small.This indicates that the performance of the side wind vertical wind turbine can’t be improved only by decreasing the blade chord length by reducing the chord length of the blades.Even when the chord length is too small,the performance of the wind turbine will deteriorate.Finally,it is concluded that when the parameters are constant,adopts three blades,and the deflector plate is installed at 90°and is located at the location of X/R=0 and Y/H=0,and the effect is the best.When the tip speed ratio is 2.8,the maximum CP is 0.391,which is 85.3% higher than that of 0.211 when there is no deflector.Which effectively improves the performance of the wind turbine and provides a reference for the design and installation of the side-winding vertical axis wind turbine.It provides a simple,economical and highly effective air gathering scheme to improve the aerodynamic performance of vertical axis wind turbines.