大型风力机叶片气弹颤振特性分析  

Analysis of Aerodynamic Flutter Characteristics of Large Wind Turbine Blades

作　　者：曲珍壮 夏鸿建[1] 李德源[1] 林伟豪 Qu Zhenzhuang;Xia Hongjian;Li Deyuan;Lin Weihao(School of Electromechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006

出　　处：《现代农业装备》2023年第4期42-49,共8页Modern Agricultural Equipment

基　　金：国家自然科学基金(51776044,51105079);广东省自然科学基金项目(2020A1515010844)。

摘　　要：随着风力机叶片尺寸和柔性的增加,风力机面临的气弹稳定性问题越发突出。为分析大型风力机叶片的气弹颤振特性,考虑转动叶片大变形引起的结构非线性效应,采用非线性几何精确梁理论,建立结构动力学模型;为描述叶片振动导致的非定常气动效应,采用叶素动量理论,并结合B-L(Beddoes-Leishman)动态失速模型,建立风力机叶片的气动载荷模型;而后采用弱形式的求积元方法,高效构建叶片的气弹耦合动力学离散平衡方程;再基于变分原理,线性化气弹耦合动力学方程,由复特征值分析法,计算叶片的气弹频率和气弹阻尼比,辨识叶片气弹颤振区域。以DTU-10MW风力机为研究对象,分析了风力机叶片在工作运行状态和定叶尖速比下的颤振特性。分析结果表明,该风力机叶片在转速1.77 rad/s时,会产生颤振失稳现象。With the increase of the size and flexibility of wind turbine blades,the aerodynamic stability of wind turbines becomes more and more prominent.In order to analyze the aerodynamic flutter characteristics of large wind turbine blades,considering the nonlinear effect of large deformation of rotating blades,the structural dynamics model adopts nonlinear geometrically exact beam theory.In order to describe the unsteady aerodynamic effects of blade vibration,the aerodynamic load model of wind turbine blades was established based on the blade element momentum theory and B-L(Beddoes-Leishman)dynamic stall model.Then,the discrete equilibrium equation of aerodynamic elastic coupling dynamics is effectively constructed from the weak-form quadrative element method.Then,based on the variational principle,the aeroelastic coupled dynamic equation was linearized,and the aeroelastic frequency and the aeroelastic damping ratio of the blade were calculated from the complex eigenvalue analysis method,and the aeroelastic flutter region of the blade was identified.Taking DTU-10MW wind turbine as the research object,the flutter characteristics of wind turbine blades under operating conditions and constant tip speed ratio were analyzed.The analysis results show that the blades of the wind turbine will produce flutter instability when the rotating speed is 1.77 rad/s.

关 键 词：风力机叶片 颤振分析 几何精确梁 特征值分析 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]