Research On Wind Turbine Blade Damage And Heat Conduction Process In Wind And Sand Environment

In recent years,with the improvement of the industrial level and the continuous improvement of people’s living standards,the problem of energy shortage has begun to arouse people’s attention.At the same time,environmental problems caused by the exploitation and use of fossil energy have become increasingly prominent,and people’s demand for the development of new energy has become increasingly urgent.As one of the most widely used new energy power generation technologies in recent years,wind power technology has the characteristics of being clean and harmless,huge in reserves,and renewable,and has attracted the attention of all walks of life.Wind turbine blades are the key to ensuring long-term and stable operation of wind turbines in harsh environments.In northwestern my country,most wind turbines operate in a harsh environment of wind and sand.On the one hand,frequent wind and sand movement can cause damage to the blades,which has a lot of negative effects on the operating efficiency and service life of the wind turbine;on the other hand,the wind and sand environment Dust accumulation on the lower blade will affect its heat transfer performance,and in severe cases,it will cause fatigue,softness,and breakage of the blade.Therefore,it is of great significance for the study of wind power blade damage characteristics,damage detection methods and the impact of dust on the heat conduction process of blades under wind and sand environments.The main research contents of this subject are as follows:Firstly,the current development status of wind power generation technology is analyzed,and the causes of blade damage and the impact of damage on wind turbines are respectively explained.By analyzing the current wind power blade damage detection methods,and the research status of the erosion and wear of wind power blade surface coatings in wind and sand environments,the research program on the impact of wind power blade damage and dust accumulation on the heat conduction process of wind power blades in wind and sand environments is proposed.Secondly,through a series of experiments,the erosion and abrasion phenomenon of dust particles on the coating of wind turbine blades under the wind and sand environment is studied.The experimental environment was constructed by the airflow sand-carrying erosion method,and the blade substrate specimens and coating materials similar to the actual wind turbine blades were prepared.According to the experimental results,the erosion and wear damage images of wind turbine blade specimens under different conditions were obtained,and they were analyzed and discussed.Then,the roughness of the specimens after erosion and abrasion was measured with the help of a surface roughness meter,and the test specimens under different conditions were obtained.The maximum contour valley depth map of the piece.The results show that the angle of attack of the blade is 30.And 45.At this time,most of its surface abrasion damage type is scratches,and the angle of attack is 60.And 90.At that time,the damage type is mostly trachoma.With the increase of the incoming wind speed and the blade angle of attack,the maximum contour valley depth at the blade damage area also increases.Third,the image processing technology is used to statistically analyze the damage and damage pits on the blade surface due to wind erosion.The changes in the shape,average area,and circumference of the blade surface damage images at different angles of attack and wind speeds are investigated.The results show that:The greater the wind speed,the more potholes on the blade surface,the more serious the damage,and the area and circumference of the erosion potholes are positively correlated with the wind speed and wind direction angle.This result reveals the characteristics of the impact of sand erosion on the surface of the blade,and provides an experimental basis for related research.Finally,the effect of dust on the heat transfer performance of blades under wind and sand environment is explored through experiments.By simulating the wind-sand environment,dust was deposited on the surface of the blade,and then the heat conduction process of the blade was measured with the help of a four-channel thermometer.The results show that the difference in temperature change when the back of the blade is heated is greater than that when the front of the blade is heated.At the same time,as the amount of dust on the surface of the blade increases,the heat transfer rate of the blade is positively correlated with the amount of dust.In addition,we found that:Its longitudinal heat transfer speed is greater than transverse heat transfer.The above results have important reference significance for the study of the influence of temperature on the mechanical properties of wind turbine blades in the wind and sand environment.The related research results of this thesis provide a clearer and more intuitive understanding of the characteristics and laws of wind power blade damage and the impact of dust on the heat conduction process of blades under wind and sand environments.At the same time,it has a high reference value for the operation and management of wind power plants in desertified areas.