Coupled-Mode Flutter of Wind Turbines and its Suppression Using Torsional Viscous Damper
Coupled-Mode Flutter of Wind Turbines and its Suppression Using Torsional Viscous Damper
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DOI：
10.1016/j.proeng.2017.09.352
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Zili Zhang;Bei Chen;S. Nielsen
中科院分区：
文献类型：
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作者：
Zili Zhang;Bei Chen;S. Nielsen
在某些情况下，更轻和更柔性的叶片的趋势可能导致风力涡轮机的气动弹性不稳定性，导致结构部件的快速破坏性失效或极限环振荡。对于变桨距风力涡轮机，随着叶片变得更长和更细，经典颤振被认为成为越来越重要的设计考虑因素。颤振是一种气动弹性不稳定现象，其中扭转叶片模式耦合到挥舞方向弯曲模式，导致挥舞方向和扭转运动的振幅相互快速增长。在本文中，一个详细的有限元（FE）模型的风力涡轮机系统的开发，与一致的建模之间的耦合的气动，弹性和惯性载荷，有显着的影响耦合模式（挥舞和扭转）的振动和稳定性。此外，还考虑了叶片振动与塔架和传动系统运动之间的弹性耦合，使得该模型能够用于完整风力涡轮机系统的耦合模式颤振分析。对DTU型10 MW风力涡轮机进行了模型参数的标定，转子颤振临界转速约为额定转速的1.6倍。提出了一种新型的扭转粘滞阻尼器来抑制叶片扭转振动，提高风力机的颤振稳定性。
The trend towards lighter and more flexible blades may lead to aeroelastic instability of wind turbines under certain circumstances, resulting in rapid destructive failure or limit-cycle oscillations of the structural components. For pitch-regulated wind turbines, classical flutter is believed to become an increasingly important design consideration as blades become longer and slender. Flutter is an aeroelastic instability phenomenon where a torsional blade mode couples to a flap-wise bending mode, leading to a mutual rapid growth of the amplitude of the flap-wise and torsional motions. In this paper, a detailed finite element (FE) model for the wind turbine system is developed, with consistent modeling of the coupling between aerodynamic, elastic and inertial loads which have significant influence on the coupled-mode (flap-wise and torsional) vibration and stability. Further, elastic coupling between blade vibrations with tower and drivetrain motions are also considered, making this model capable for coupled-mode flutter analysis of a complete wind turbine system. The parameters of the model have been calibrated to the DTU 10MW wind turbine, and the critical flutter speed of the rotor is shown to be about 1.6 times its nominal rotational speed. A novel torsional viscous damper is then proposed to suppress torsional blade vibration and to enhance flutter stability of wind turbines.