Research On Icing Characteristics Of Wind Turbine Blades In Low Temperature Environment

As a green and non-polluting energy source,wind energy has the advantages of optimizing energy structure,protecting the ecological environment,and promoting the sustainable and harmonious development of society and economy.It has been widely concerned and applied at home and abroad.The availability of wind resources in low-temperature areas in China is relatively high,which makes the installation of wind farms in high-altitude areas and cold areas more and more.At this time,wind turbines are extremely vulnerable to frost and icing hazards,resulting in their The power reduction and even the occurrence of safety accidents,for this paper,the common wind turbine blade airfoil and three-dimensional blades are taken as the research objects,and the CFD numerical simulation method is used to study the wind turbine blade icing characteristics in low temperature environment in detail.The thesis first expounds the basic theory of wind turbine icing,and compares the water droplet impact characteristics and icing appearance data of the airfoil obtained by the CFD numerical simulation method with the experimental data to verify the feasibility of the CFD method.The effects of different wind speed,angle of attack,temperature and other parameters on the impact characteristics of water droplets and icing curves on the surface of the S809 airfoil were studied in low temperature environments.Through the changes in icing on the airfoil surface,the different factors on the surface of the S809 airfoil were summarized The law of the influence of ice characteristics provides a basis for the design and research of wind turbines in cold areasSecondly,select 10 different airfoil airfoils,simulate and calculate the icing on the airfoil surface under the same working conditions.After combining the airfoil's characteristic parameters,it is found that the airfoil's anti-icing ability is better than that of the airfoil.The maximum thickness and its relative position are related.The greater the maximum thickness of the airfoil and the closer the corresponding position is to the leading edge of the airfoil,the better the ice resistance,which provides a reference for the selection of wind turbine blade airfoil in cold regionsFinally,the icing characteristics of the three-dimensional blade model under low temperature environment are simulated and calculated.By comparing the icing distribution on the blade surface under different working conditions,the conclusion is as follows:Increased wind speed will guide the total icing on the blade surface.As the amount increases,the icing area is concentrated;the rotation speed and the water content in the air will affect the total amount of icing on the blade surface and the relative icing area.The decrease in temperature will lead to an increase in the total amount of ice on the blade surface and the relative ice area,but under the clear ice ice type,the ice area on the suction surface has a significant tendency to shrink;while the increase in the diameter of the water droplets will cause the total amount of ice on the blade surface to decrease,The relative icing area is reduced;the angle of attack of the incoming velocity will mainly affect the distribution of the icing area on the blade surfaceThe study on the characteristics of wind turbine blade icing under low temperature environment provides a theoretical basis for the design optimization of wind turbines in cold regions and the protection of wind turbine blades from icing,which is beneficial to the application of wind turbines in cold regionsFigure[40]Table[4]Reference[70]...