Classical flutter of wind turbine blades is one of the most destructive instability phenomena of wind turbines especially for several-MW-scale turbines. In the present work, flutter performance of the DTU 10-MW offshore wind turbine is investigated using a 907-degree-of-freedom aero-hydro-servo-elastic wind turbine model. This model involves the couplings between tower, blades and drivetrain vibrations. Furthermore, the three-dimensional aerodynamic effects on wind turbine blade tip have also been considered through the blade element momentum theory with Bak’s stall delay model and Shen’s tip loss correction model. Numerical simulations have been carried out using data calibrated to the referential DTU 10-MW offshore wind turbine. Comparison of the aeroelastic responses between the onshore and offshore wind turbines is made. Effect of structural damping on the flutter speed of this 10-MW offshore wind turbine is investigated. Results show that the damping in the torsional mode has predominant impact on the flutter limits in comparison with that in the bending mode. Furthermore, for shallow water offshore wind turbines, hydrodynamic loads have small effects on its aeroelastic response.

中文翻译：

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影响10MW海上风力发电机颤振性能的结构阻尼敏感性

风力机叶片的经典颤振是风力机最具破坏性的不稳定现象之一，特别是对于几兆瓦级涡轮机。在目前的工作中，使用 907 自由度的气动-水力-伺服-弹性风力涡轮机模型研究了 DTU 10-MW 海上风力涡轮机的颤振性能。该模型涉及塔架、叶片和传动系统振动之间的耦合。此外，还通过叶片元动量理论，结合Bak的失速延迟模型和Shen的叶尖损失修正模型，考虑了风力机叶尖的三维气动效应。数值模拟已使用校准到参考 DTU 10-MW 海上风力涡轮机的数据进行。对陆上和海上风力涡轮机之间的气动弹性响应进行了比较。研究了结构阻尼对这台 10 兆瓦海上风力发电机颤振速度的影响。结果表明，与弯曲模式相比，扭转模式下的阻尼对颤振极限的影响更大。此外，对于浅水海上风力涡轮机，水动力载荷对其气动弹性响应的影响很小。