为了研究预弯外形对风力机气弹稳定性的影响,以某2 MW低风速风电叶片为研究对象,采用外形参数化表达方法构造叶尖预弯量分别为3、4和5 m的叶片。基于SIMPACK软件建立并验证气-弹-控耦合的风力机整机模型,对配装不同预弯叶片的风力机进行仿真分析。结果显示,在湍流风况下,随着叶尖预弯量的增大,叶根载荷、叶尖附近截面的气弹变形量和动态失速程度都有明显增加;对预弯5 m叶片的动态气弹变形进行频域分析,发现在一阶摆振和扭转方向发生共振现象,表明过大的叶尖预弯设计量会使叶片产生气弹失稳问题。
Abstract
In order to study the effect of the pre-bend shape on the aeroelastic stability of wind turbines, by using the parametric modeling method, three blades with different pre-curved shape were constructed. Based on SIMPACK software, the multi-disciplinary model of wind turbines coupling of aerodynamics-elasticity-control was built. As a research object, the performances of a 2 MW wind turbine with different pre-bend blades were studied, the result shows that under turbulent wind conditions with the increase of pre-bend value of the blade-tip, the ultimate loads of the blade root and the dynamic deformations of the blade section near the blade-tip increased significantly. By through the frequency-domain analysis of the pre-bend 5 m blade, resonance occurs near the first natural frequency in edgewise and torsional deflection, which means that the oversize amount of the pre-bend value in blade-tip will cause instability problems.
关键词
风力机叶片 /
刚柔耦合 /
气弹变形 /
预弯外形 /
气弹稳定性
Key words
wind turbine blades /
rigid-flexible coupling /
aero-elastic deformation /
pre-bend shape /
aero-elastic stability
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基金
国家自然科学基金（51705545; 51975190）
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