Analysis And Research On Aerodynamic Characteristics And Wear Of 1.5MW Wind Turbine Blades In Wind And Sand Environment

Wind energy is the most abundant renewable energy in the world.The trend of wind power industry is booming.Onshore wind turbines are mostly located in the wind and sand environment,which makes the wind turbine blades suffer the erosion of wind and sand,which has a great impact on the safe and stable operation and energy output of wind turbines.Based on the SN-equation,combined with SST k-ω Turbulence Model and DPM model,the aerodynamic characteristics and erosion wear behavior of blades are numerically calculated in this paper.By analyzing the changes of blade characteristics of wind turbine blades under different working conditions,the effects of blade tip speed ratio and particle diameter on the aerodynamic characteristics and erosion wear characteristics of wind turbine blades are studied,and the following main conclusions are obtained:(1)Effects of tip speed ratio on aerodynamic characteristics and erosion wear characteristics of wind turbine blades(1)Under the wind sand environment,the dynamic pressure on the blade surface rotating at a constant speed increases with the decrease of blade tip speed ratio.The pressure at the leading edge of the windward side of the blade tip is the largest,and the pressure difference at the blade tip is the largest,resulting in the largest torque,indicating that the blade tip is the main part of torque.In addition,the torque and power of wind turbine increase with the decrease of blade tip speed ratio.(2)With the decrease of tip speed ratio,the velocity on the upper surface is significantly higher than that on the lower surface.The vortex phenomenon appears on the lower surface because of the sharp decrease of air velocity.On the section closer to the blade tip,the angle of attack of the incoming flow on the wind turbine blade becomes larger,and the current flow situation gradually changes from attached flow to separated flow.The greater the strength of the separated vortex generated at the trailing edge,the lower the lift coefficient and the lift drag ratio,resulting in stall behavior.(3)With the decrease of blade tip speed ratio,the impact angle of particle blade increases on the windward side,which makes the flow of wind sand flow on the surface of wind turbine blade separate in advance,and the particles cannot adhere and flow along the surface,resulting in the reduction of particle concentration distribution at the tail edge of the same section of the blade.The particles are mainly distributed in the leading edge of the blade,and the wear at the leading edge of the blade tip is the most serious.(2)Study on the influence of particle diameter on the aerodynamic characteristics and erosion wear characteristics of wind turbine blades(1)Different λ when the particle diameter changes,the change trend of the torque and power produced by the wind turbine blade is almost the same.With the increase of particle size,the torque and power generated by wind turbine blades decrease first and then increase.When the particle diameter is greater than 50 μm,it tends to be stable.The addition of particles with small particle size will reduce the power of the wind turbine compared with that of the wind turbine.(2)With the increase of particle diameter,the wear area of wind turbine blade surface diffuses from the leading edge to the trailing edge,and gradually diffuses from the blade tip to the blade root on the whole.With the increase of particle diameter,when the particle size increases from 20μm to 30 μm,the blade wear rate increases very rapidly and changes linearly.When the particle size increases from 40 μm to 60 μm,the growth rate of blade wear rate slows down.