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首页> 外文期刊>Renewable energy >Non-linear aeroelasticity: An approach to compute the response of three-blade large-scale horizontal-axis wind turbines
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Non-linear aeroelasticity: An approach to compute the response of three-blade large-scale horizontal-axis wind turbines

机译：非线性气动弹性：一种计算三叶片大型水平轴风力发电机响应的方法

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摘要

In this work, we present an aeroelastic model intended for three-blade large-scale horizontal-axis wind turbines. This model results from the coupling of an existing aerodynamic model and a structural model based on a segregated formulation derived in an index-based notation that enables combining very different descriptions such as rigid-body dynamics, assumed-modes techniques and finite element methods. The developed structural model comprises a supporting tower, a nacelle, which contains the electrical generator, power electronics and control systems, a hub in which the blades are connected to a rotating shaft, and three blades, which extract energy from the wind. Flexible blades are discretized into beam finite elements and the flexible tower is discretized into assumed modes. The nacelle and hub are considered rigid. To illustrate the flexibility of the structural modeling, the tower, nacelle and hub are modeled as a single kinematic chain and each blade is modeled separately. To establish the blade-hub attachments, we use constraint equations. Thus, the resulting equations are differential algebraic. We also expose a general procedure for connecting the non-matching structural and aerodynamic meshes. Finally, we present results, some of them are validations, which prove that our new approach is reliable and does have capability to capture non-linear phenomena such as centrifugal stiffening, flutter and large yaw errors, and the remaining ones correspond to the aeroelastic response of a wind turbine during a start-up maneuvering.
机译：在这项工作中，我们提出了一种用于三叶片大型水平轴风力涡轮机的气动弹性模型。该模型基于现有的空气动力学模型和结构模型的耦合而产生，该模型基于以索引为基础的表示法中的分离公式，从而能够结合非常不同的描述，例如刚体动力学，假定模式技术和有限元方法。开发的结构模型包括一个支撑塔，一个机舱，其中包含发电机，电力电子设备和控制系统，一个轮毂（其中叶片连接到旋转轴）和三个叶片，这些叶片从风中提取能量。挠性叶片离散为梁有限元，挠性塔离散为假定模式。机舱和轮毂被认为是刚性的。为了说明结构建模的灵活性，将塔架，机舱和轮毂建模为单个运动链，并对每个叶片分别进行建模。要建立叶片轮毂附件，我们使用约束方程式。因此，所得方程为微分代数。我们还公开了连接不匹配的结构网格和气动网格的一般过程。最后，我们给出了结果，其中一些是验证性的，这证明了我们的新方法可靠，并且确实能够捕获非线性现象，例如离心刚度，颤动和大偏航误差，其余的与气动弹性响应相对应。启动过程中的风力涡轮机的示意图。

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