风力机叶片涂层风沙冲蚀磨损特性的风洞试验研究

WIND TUNNEL EXPERIMENTAL STUDY ON EROSION AND WEAR CHARACTERISTICS OF WIND TURBINE BLADE COATING

传统的挟沙冲蚀试验台与风沙风洞难以构建均匀风沙流场,难以准确反映风力机叶片的风沙磨损特性。因此,在改造的风沙风洞中,通过对风力机叶片平板试样开展涂层冲蚀磨损试验,探究不同冲击速度、冲击角度及有效截面质量流率对风力机叶片涂层材料冲蚀特性的影响规律。试验结果表明:有效颗粒质量流率一定时,在相同冲击速度与冲击时间内,磨损量在冲击角度约为30°时达到最大。小于30°时,磨损量随冲击角度的增大而快速增加,大于30°时磨损量随冲击角度的增大而逐渐降低;磨损量随冲击速度的增大而增大;磨损量随有效颗粒质量流率的增大而呈线性增大趋势;切削磨损量与总磨损量有相同趋势,冲击磨损量随着冲击角度的增大而逐渐增大。

It is difficult to construct a uniform wind sand flow field and accurately reflect the wind sand wear characteristics of wind turbine blades using the traditional sand erosion test-bed and wind sand wind tunnel.Therefore,in this paper,the coating erosion wear tests are carried out on the flat plate samples of wind turbine blades in the modified wind-sand wind tunnel.The influence of different impact velocity,impact angle and effective cross-sectional mass flow rate on the erosion characteristics of wind turbine blade coating materials is researched.The experimental results show that when the effective particle mass flow rate is constant,the impact angle is about 30°under the same impact velocity and impact time,the wear loss reaches the maximum.When the impact angle is less than 30°,the wear loss increases rapidly with the increase of impact angle,and when the impact angle is greater than 30°,the wear loss decreases gradually with the increase of impact angle;The wear loss increases with the increase of impact velocity,and increases linearly with the increase of effective particle mass flow rate.The cutting wear has the same trend as the total wear,and the impact wear increases with the increase of impact angle.