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Classical aeroelastic stability analysis of large composite wind turbine blades

机译：大型复合风力涡轮机叶片的经典空气弹性稳定性分析

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To achieve higher energy production bigger wind turbine systems with very long blades are increasingly used in the wind turbine industry. As the length of the wind turbine blades is increased, blades become more flexible in bending and torsion. Increased bending and torsional flexibility of long wind turbine blades may cause torsional divergence and flapwise bending-torsion flutter at high speeds. Therefore, it is important that aeroelastic stability characteristics of the blades be investigated to ensure that wind turbine system is free of any aeroelastic instability. In this study, classical aeroelastic stability approach is applied to a simplified composite blade model. For the purpose of the study, the composite wind turbine blade is modeled as an elastic cantilevered rotating thin-walled composite box beam with the developed Circumferentially Asymmetric Stiffness (CAS) structural model. Circumferentially asymmetric stiffness structural model takes into account a group of non-classical effects such as the transverse shear, the material anisotropy and warping restraint The aerodynamic strip method based on indicial function in unsteady incompressible flow is used to simulate incompressible unsteady aerodynamic effects. Hamilton's principle and the extended Galerldn's method are used to obtain the coupled linear governing system of dynamic equations. Preliminary results show that fiber angle of the CAS structural model affects the aeroelastic instability speed significantly and fiber angle also controls the aeroelastic instability mode.
机译：为了实现更高的能量生产，越来越长的风力涡轮机系统越来越多地用于风力涡轮机行业。随着风力涡轮机叶片的长度增加，叶片在弯曲和扭转方面变得更加灵活。长风力涡轮机叶片的弯曲和扭转柔韧性增加可能导致扭转沟渠和高速摇动扭转扭转颤动。因此，重要的是，研究叶片的空气弹性稳定性特性，以确保风力涡轮机系统没有任何空气弹性不稳定性。在该研究中，经典的空气弹性稳定性方法应用于简化的复合刀片模型。出于该研究的目的，复合风力涡轮机叶片用弹性悬臂式旋转薄壁复合盒梁建模，其具有开发的周向不对称刚度（CAS）结构模型。周向不对称刚度结构模型考虑了一组非古典效果，例如横剪，材料各向异性和翘曲约束基于非稳定不可压缩流量的标记功能的空气动力学条方法用于模拟不可压缩的不稳定空气动力学效果。汉密尔顿的原理和扩展的Galerldn的方法用于获得动态方程的耦合线性控制系统。初步结果表明，CAS结构模型的光纤角度显着影响空气弹性不稳定速度，光纤角度也控制了空气弹性不稳定模式。

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