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研究叶片振动与扭转变形对气动载荷的反馈以及基于静、动态气动模型的叶根载荷的差异。应用计算多体动力学理论和叶片气动模型,建立受约束的柔性叶片非线性气弹耦合方程,得出叶片气弹耦合时域响应。以某5 MW风力机叶片为研究对象,研究柔性叶片的振动和变形对叶根力矩的反馈;在修正的叶素动量理论(BEM)基础上,引入Beddoes-Lesihman动态失速模型,考察叶片气动载荷的非定常效应。分析表明,随着叶片柔性增加,气弹耦合现象愈加明显;动态失速将引起叶片载荷有较大的振荡幅值和频率,影响叶片疲劳载荷谱的分析和疲劳寿命的设计。
The effects of blade vibration and torsional deformation on the aerodynamic loads and the difference of blade root loads based on static and dynamic aerodynamic models were studied. The multi-body dynamics theory and the aerodynamic model of the blade are used to establish the nonlinear elastic-elastic coupling equations of the flexible blade. The time-domain response of the aerodynamic coupling is obtained. Taking a 5MW wind turbine blade as the research object, the feedback of the vibration and deformation of the flexible blade to the leaf root torque was studied. Based on the revised theory of the leaf element momentum, Beddoes-Lesihman dynamic stall model was introduced to investigate the aerodynamic load Unsteady effect. The analysis shows that as the flexibility of the blade increases, the phenomenon of the gas-spring coupling becomes more obvious. The dynamic stall will cause the blade to oscillate with larger amplitude and frequency, which affects the analysis of the fatigue load spectrum and the design of the fatigue life.