现代风力机大型化发展导致叶片质量大幅增加,但现有复合材料叶片轻量化方法易导致其结构刚度降低和局部屈曲失稳等问题。因此,参照植物叶片主脉与支脉特征,在复合材料叶片主梁两侧布置不同朝向角度和纤维角度的支脉梁,以提升叶片结构性能。通过流固耦合方法对叶片进行模态、结构静力学及屈曲分析,结果表明：不同角度的支脉梁布置均可使叶片减重约6%,且叶尖位移及最大应力均在叶片设计要求范围之内；添加支脉梁结构可提升风力机叶片的屈曲稳定性,且绝大多数情况下支脉梁的纤维角度与朝向角度相同时可进一步提高屈曲因子；在确保叶片稳定及抗共振性能的前提下,当支脉梁与主梁夹角和支脉梁纤维方向均为150°时,叶片综合性能更佳。

The large-scale development of modern wind turbines has led to a significant increase in blade mass, but the existing lightweighting methods for composite blades are prone to problems such as reduced structural stiffness and local buckling instability. Therefore, with reference to the characteristics of main veins and branch veins of plant blades, branch vein beams with different orientation angles and fiber angles are arranged on both sides of the main beams of composite blades to enhance the structural performance of the blades. The modal, structural static and buckling analyses of the blade are carried out by the fluid-solid coupling method, and the results show that: the arrangement of the branch vein beams with different angles can reduce the weight of the blade by about 6%, and the tip displacement and the maximum stress are all within the range of the design requirements of the blade; the addition of the branch vein beams can improve the buckling stability of the wind turbine blade, and the fiber angle of the branch vein beams and the same angle of orientation in the vast majority of cases can further improve the buckling Under the premise of ensuring the stability and anti-resonance performance of the blade, the comprehensive performance of the blade is better when the angle between the branch vein beam and the main beam and the fiber direction of the branch vein beam are both 150°.

TK83

国家自然科学(52106262,52376204)；上海市IV类高峰学科-能源科学与技术-上海非碳基能源转换与利用研究院建设项目。Fund-supported Project: National Natural Science Foundation of China (52106262,52376204);the construction project of Shanghai Institute of Non-Carbon-based Energy Conversion and Utilization, Shanghai IV Peak Disciplines-Energy Science and Technology.