Abstract: Abstract: Wind power generation is one of the most development prospect power generation modes. How to increase power generation has become the focus of attention. As an important device for wind power generation, wind turbine's operating environment will directly affect the amount of power generation. When wind turbine runs in a wind-sand environment, the sand particles collide with the blades, causing erosion on the surface of the blade, affecting the aerodynamic performance of wind turbine and reducing the power generation efficiency of wind turbine. Therefore, it is necessary to study the erosion characteristics of wind turbine airfoil in wind-sand environment. When studying the erosion characteristics of wind turbine airfoil, sand is usually simplified into spherical particles, ignoring the influence of particle shape. Relevant researches show that particle shape has a certain influence on the erosion rate of materials, and the multi-angular particles have stronger erosion damage ability to materials than the spherical smooth particles. Therefore, this paper mainly studies the influence of particle shape on the airfoil erosion characteristic and the range of critical particle Stokes number when the airfoil begain to erosion, and the flow field of NACA 0012 straight blade in wind-sand environment is simulated by SST k-ω model and discrete phase model (DPM). Four types of particle with particle shape factors of 0.671, 0.75, 0.846 and 1 are defined by shape factor. The effects of particles with four different shapes on erosion characteristics and aerodynamic performance of wind turbine airfoil are studied, and the influence of the particle shape on the range of critical Stokes number at the beginning of erosion is also researched. The results show that the maximum erosion rate of airfoil varies with particle volume equivalent diameter in the same way for four particle shapes. The maximum erosion rate of airfoil increases with the increases of particle volume equivalent diameter, but decreases slightly when particle volume equivalent diameter is 80 μm. The erosion degree of airfoil surface for four particle shapes is different, when the volume equivalent diameter of particles is the same, the erosion effect of spherical particles on airfoil is less than that of aspherical particles. The particle shape has little effect on the erosion zone of airfoil surface, the increases of the particle volume equivalent diameter, the erosion zone of airfoil surface gradually expands from the vicinity of airfoil leading edge along airfoil pressure surface toward airfoil trailing edge, and the most severe erosion area on the airfoil surface appears near the leading edge. When the particle diameter is 20 μm, compared with the non-spherical particles whose shape factor is less than 1, the initial erosion zone of the spherical particles on the airfoil surface moves slightly to the suction surface. Particle shape has little effect on lift coefficient and lift-to-drag ratio of airfoil, which is almost negligible. The particle shape has some influence on the range of critical particle Stokes number that airfoil begain to erosion. The Stokes number of the airfoil when it begins to erosion is different for different particle shapes. The smaller the particle shape factor is, the larger the critical particle Stokes number of airfoil begains to erosion is. Although the particle shape has a certain influence on the critical particle Stokes number of airfoil erosion, there is still a critical particle Stokes number which can be used to determine whether the airfoil surface is eroded. The research results can provide guidance for wind turbine blade anti-sand erosion design.