The Study On The Erosion Wear Resistance And Aerodynamic Performance Improvement Of Wind Turbine Airfoil Based On The Flow Control

China’s wind power can be divided into onshore wind power and offshore wind power,offshore wind power as the main focus of the scientific front in recent years,the domestic installed capacity accounted for year by year.However,onshore wind turbines are still the mainstream of China’s development,and their market share should not be underestimated.The distribution of onshore wind turbines is mainly in the northwest and north China,and the northwest is the main area of sandstorms,so the wind turbines in this area will be subject to the wind and sand for a long time,which will cause the wind turbine wear and erosion phenomenon and lead to the reduction of aerodynamic performance.Flow control methods can be used to improve the aerodynamic performance of the airfoil,while also influencing the flow path of the sand particles and reducing the wear of the airfoil.It is therefore necessary to investigate flow control methods in conjunction with gas-solid two-phase flow.This paper investigates the effect of flow control methods on the aerodynamic performance and erosion wear of airfoils in a sandy environment,using the NACA 0012 airfoil as the research object.The main research elements of this paper are as follows:(1)Numerical simulation of NACA 0012 airfoil in windy and sandy environment was carried out,and the analysis of the results showed that the wear area of the airfoil is mostly located on the front edge of the airfoil and the part of the pressure surface.In the particle concentration and vortex diagrams,it can be found that when the cylinder is used as the control body,the low particle concentration area wraps around the wear area of the airfoil,and the vortex diagram shows that the cylinder reduces the vortex gradient in the suction and pressure surfaces of the airfoil,which improves the lift-to-drag ratio of the airfoil.For different diameters of the cylinder,the cylinder generates a positive vortex region,forming an outward gradient difference,which affects the particle trajectory,causing a flared outward flow and reducing the number of particles hitting on the airfoil,thus reducing the wear of the airfoil.The control capacity increases as the diameter of the cylinder increases,but after the diameter reaches 2 cm the control capacity gradually remains stable.(2)The influence of tiny columns on the airfoil under different incoming wind conditions was studied.At different particle sizes,the lift to resistance ratio of the control airfoil is better than the original airfoil,and the wear is less than the original airfoil,and the aerodynamic aspect is less affected by the change of particle size.After 100 μm,the reduction in wear of the control airfoil gradually decreases,and the wear of the control airfoil is close to that of the original airfoil;at different particle concentrations,the lift-to-resistance ratio of the control airfoil is higher than that of the original airfoil,but the wear is less than that of the original airfoil.In studying the aerodynamic performance of the control airfoil,it was found that although the lift-to-drag coefficients of the control airfoil were all greater than the original airfoil,the effect of the tiny cylinder on the airfoil drag coefficient was much greater than the lift coefficient,ultimately resulting in a lift-to-drag ratio greater than that of the original airfoil.(3)The effect of the micro cylinder on the airfoil was studied for three airfoils with different relative thicknesses(maximum relative thickness of 12%,15% and 18%)and three airfoils with different relative curvatures(maximum relative curvatures of 1%,3% and 5%).The control range of the angle of attack decreases,and the wear of the control airfoil is greatest at 8° angle of attack,while the aerodynamic critical sudden change in angle of attack(defined as the change in the lift-to-resistance ratio of the control airfoil from higher than the original airfoil to a critical angle of attack value lower than the original airfoil)increases,and the control capability of the micro cylinder is better at small angles of attack,and the lift-toresistance ratio is greatest at 8° angle of attack;as the relative curvature increases,the optimal area for reducing wear using the micro cylinder is smaller,and the As the relative curvature increases,the control range of the micro cylinder becomes smaller and the applicable range of the corresponding angle of attack decreases,but the peak angle of attack for wear increases,while the pneumatic critical sudden change angle of attack increases with the relative curvature.