针对某分布式水平轴风力机叶片,首次提出于翼型吸力面进行基于翼型凹变的结构改良,以额定工况时不降低叶片功率输出为前提,成功地将翼型凹变应用于叶片刚度、阻尼比及频率上的有效改进。研究揭示,翼型向内侧凹变可较好地控制吸力面绕流的汇聚位置和影响范围,配合凹槽对汇聚流线流动的诱导效应,可在一定程度上减小吸力面气体流动的能量损伤,提升叶片的做功能力。此外,翼型凹变可显著将风轮1、2阶阻尼比及叶片刚度分别提高3-9%与32%,可有效将叶片最大位移及应变值,同时降低28%与19%。翼型凹变在风力机叶片设计中的成功应用,不仅为翼型族的衍生提供了新的实现方法,并且可为叶片气动性能和结构动力学性能的兼优性开发提供新的实现途径。
Abstract
In this study, the blade of a distributed horizontal axis wind turbine was selected as the research model and its stiffness, damping ratio and natural frequency were improved for the first time by airfoil concave on the premise of not reducing the blade power output under the rated working condition.The research revealed that the airfoil’s inner concave on the suction surface could better control the position and influence range of airflow convergence on suction surface, and combined with the inducing effect of grooves on the convergence streamline, it can reduce the energy loss of airflow to a certain extent and improve the blade’s aerodynamic performance.In addition, the airfoil concave can significantly increase 1st-order and 2nd-order damping ratios of the wind wheel by 3%— 9%, increase the stiffness value of the blade by 32%, and effectively reduce the maximum displacement and the maximum strain of the blade by 28% and 19%, respectively.Successful application of airfoil concave in the design of wind turbine blades will not only provide a new method for the derivation of airfoil family, but can also provide a new way for synchronous optimization of the aerodynamic performance and structural dynamic performance of the blade.
关键词
叶片 /
翼型凹变 /
做功能力 /
刚度 /
阻尼比 /
位移 /
应变
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Key words
blade /
airfoil concave /
capability of doing work /
stiffness /
damping ratio /
displacement /
strain.
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