风力机翼型风沙冲蚀磨损演化过程研究

Study on the Evolution of Wind Turbine Airfoil Sandstorm Erosion Wear

为了研究风沙环境下风力机翼型表面磨损的演化过程及机理,以兰州理工大学外场实验风力机叶片的6个截面翼型为研究对象,采用SST k-ω湍流模型和离散相模型(DPM)求解气固两相流动,并结合磨损模型进行数值模拟。研究发现,2年后翼型表面出现不同程度的砂眼、小坑和脱层;随着时间的推进,各个截面翼型前缘脱层深度不断增加,已有砂眼附近产生大量新的砂眼,大部分砂眼和小坑的横向尺寸及局部深度逐渐增加,部分相邻的砂眼和小坑逐渐联通形成小坑和局部脱层;随着颗粒的不断撞击,小坑和局部脱层的横向尺寸沿弦线方向不断扩大,翼型的磨损程度逐渐加剧。

In order to study the evolution process and mechanism of wind turbine airfoil surface wear under sandstorm environment,taking 6 cross-section airfoils of wind turbine blades in field experiment of Lanzhou University of Technology as the research object,which used SST k-ωturbulence model and discrete phase model(DPM)to solve the gas-solid two-phase flow,and combining the wear model for numerical simulation.It was found that the airfoil surface had different degrees of sand holes,pits and delamination after two years.With the advance of time,the delamination depth of the leading edge of each section of airfoil keeps increasing,and a large number of new sand holes are generated near the existing sand holes.The transverse size and local depth of most sand holes and pits gradually increase,and some adjacent sand holes and pits gradually connect to form a new and bigger pits and local delamination.With the constant impact of particles,the transverse dimensions of pits and local delamination are expanding along the direction of string,and the wear degree of airfoils is increasing.