【摘要】 风力发电作为中国第三大电力供应方式，在国家能源结构调整、实现碳达峰中和目标上有着举足轻重的作用。随着近年来风电产业的快速发展，风力机的大型化优势日益凸显，但叶片长柔化带来的颤振问题亟待解决。基于三维流固耦合条件下的有限元计算实现风力机叶片颤振过程的动态仿真，给出叶片颤振判定依据，从而获得颤振发生的临界速度，并由此研究颤振临界速度与桨距角之间的关系，并分析失速颤振发生的动力学机理。结果表明：风力机叶片的颤振临界风速随着攻角的增加呈现递增趋势。当叶片的升力频率与摆振频率接近时，系统易发生颤振现象。进一步对应力分析揭示，叶片局部应力与变形相位一致时导致气动力转化为激振力，从而引发颤振并使位移呈现发散特征。研究成果为大型风机叶片在运行中的动态颤振行为研究提供了创新性分析视角。更多还原

【Abstract】 As the third largest power supply mode in China, wind power generation plays a crucial role in the adjustment of the national energy structure and the achievement of the goals of carbon peaking and carbon neutrality. With the rapid development of the wind power industry in recent years, the advantages of the upscaling of wind turbines have become increasingly prominent. However, the flutter problem caused by the long and flexible blades urgently needs to be solved. Based on the finite element calculation under the three-dimensional fluid-structure interaction condition, the dynamic simulation of the flutter process of wind turbine blades was realized, the judgment basis for blade flutter was presented, and thus the critical speed was obtained at which flutter occured. Furthermore, the relationship between the critical flutter speed and the pitch angle was studied, and the dynamic mechanism of stall flutter was analyzed. The results show that the critical flutter wind speed of wind turbine blades shows an increasing trend with the increase of the angle of attack. When the lift frequency of the blade is close to the pitching frequency, the system is prone to flutter. Further stress analysis reveals that when the local stress and deformation phase of the blade are consistent, the aerodynamic force is converted into an exciting force, which triggers flutter and makes the displacement exhibit a divergent characteristic. The research results provide an innovative analytical perspective for the study of the dynamic flutter behavior of large wind turbine blades during operation.更多还原