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针对兆瓦级风力机叶片二元翼段,基于气动弹性力学理论,分别建立了其准定常气动力结构运动耦合模型及非定常气动力结构运动耦合模型。应用该计算模型,对美国可再生能源实验室5 MW大型风力机叶片某截面段进行了颤振分析。重点研究结构参数对叶片气动弹性稳定性的影响规律,研究发现风力机叶片弹性轴的位置、重心的位置沿弦长的变化对颤振速度的影响很大,并提出了提高颤振速度的措施;对两种耦合模型计算结果进行了对比分析,并分析其差异原因。文中的研究对于兆瓦级复合材料风力机叶片,怎样合理地进行叶片内部结构设计从而提高颤振速度甚至是避免发生颤振等不稳定性现象具有理论指导意义。
According to the aeroelastic theory, the coupled model of quasi-steady aerodynamic structure and the coupled model of unsteady aerodynamic structure are established for the dual-wing section of megawatt wind turbine blade. Applying this computational model, flutter analysis was performed on a section of 5 MW large wind turbine blades in a US renewable energy laboratory. The research focuses on the influence of structure parameters on the aerodynamic stability of blades. It is found that the position of the elastic axis and the position of the center of gravity of the wind turbine have a great influence on the flutter velocity along the chord, and some measures to increase the flutter velocity are proposed The results of two coupled models are compared and analyzed, and the causes of the differences are analyzed. The research in this article is theoretically instructive for the megawatt composite wind turbine blade, how to reasonably design the internal structure of the blade so as to increase the flutter speed and even avoid the instability phenomena such as flutter.