Simulation And Analysis Of Wind Erosion Wear Of Wind Turbine Blades And Experimental Research

In wind sand environment,erosion failure of wind turbine blades is very easy which causes the wear of the blade surface.The Coating is of great significance for wind turbine blades.There is a certain reference for the making process of blade coating of wind turbine,the invention of coating materials and the blade maintenance during the operation of wind turbine to study the erosion wear law of wind turbine blade coating under wind sand environment.The elastic half space physical model is established in this paper based on the theory of contact mechanics.The distribution of maximum normal stress and maximum shear stress inside the coating is simulated in the process of sand with different impact velocity,different impact angles and different particle sizes impacting blade coating in ANSYS.The change trend of coating stress with impact velocity and impact angle and the damage of coating surface after sand impact coating is also studied.The orthogonal test was designed based on FLUENT software in order to explore the main and subordinate sequence affecting the erosive rate of blade surface.The two regression equation between the relative erosive rate of coating surface and different influencing factors was also obtained by orthogonal regression test.The results show that:1.The particle size is small,the internal coating normal stress increased with increasing impact velocity and impact angle of sand;but in the particle size increases to a certain extent after coating internal normal stress shock,with the increase of impact angle increase first and then decreases and then increases again.2.For the shear stress of the coating and the shear stress on the contact surface between the coating and the substrate,the shear stress increases with the increase of impact angle and impact velocity under the same particle size.3.By coating the surface of the yield stress in the particle size is small,the equivalent stress of the coating surface coating did not reach the material yield strength,elastic deformation of coating materials;in particle size is large,the equivalent surface stress exceeds the yield strength of materials,plastic materials.4.At the same speed of sand particles,the equivalent stress of the coating increases first and then decreases,which is consistent with polyurethane coating material.5.The orthogonal test results show that particle impact velocity is the most important factor affecting particle erosion rate,particle size is the second and impact angle is the least.From the two regression equation of erosive rate and influencing factors,it is known thatthe larger the particle velocity,the larger the particle size and the smaller the impact angle,the larger the erosion rate of the coating surface is.