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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Methods of modeling slope discontinuities in large size wind turbine blades using absolute nodal coordinate formulation
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Methods of modeling slope discontinuities in large size wind turbine blades using absolute nodal coordinate formulation

机译：使用绝对节点坐标公式对大型风力涡轮机叶片的坡度不连续性进行建模的方法

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This paper describes and evaluates the use of the Absolute Nodal Coordinate Formulation (ANCF) in modeling large size wind turbine blades. Modern blade model can be divided into two regions classified by aerodynamic and structural function. The aerodynamic region, blade-span, is utilizing the thinnest possible airfoil section. On the other hand, the transition between the circular mount and the first airfoil profile is referred as blade-root region, which carries highest loads along the blade. In this investigation, an efficient procedure is developed for mapping NACA airfoil wind-turbine blades into ANCF thin plate models. The procedure concerns a complete wind turbine blade structure, blade-root as well as the blade-span regions with non-uniform and twisted nature. As a result, the slope discontinuity problem arises in both chord-wise and span-wise directions, and consequently presents numerical errors in dynamic simulation. The paper investigates the methods of modeling slope discontinuity resulting from the variations of the cross-sectional layouts across the blade. The developed method is applied for the gradient-deficient thin plate element in order to account for structural discontinuity. In addition, the aerodynamic loads are precisely expressed and the aerodynamic characteristics of such blades are examined with the ANCF and with the classical finite element method. The static and dynamic solutions of different operating conditions are obtained and results are compared with those obtained using ANSYS code. Both the limitations and advantages of using the ANCF in modeling large size wind turbine blades are concluded and discussed. A Dynamics for Design (DFD) procedure is presented with numerical example concerning large-rotation, large deformation wind turbine blades.
机译：本文描述并评估了在大型风力涡轮机叶片建模中使用的绝对节点坐标公式（ANCF）。现代叶片模型可以根据空气动力学和结构功能分为两个区域。空气动力学区域（叶片跨度）正在利用最薄的机翼部分。另一方面，圆形安装座和第一翼型轮廓之间的过渡称为叶片根部区域，该区域沿叶片承受最高载荷。在这项研究中，开发了一种有效的程序，可将NACA机翼风力涡轮机叶片映射到ANCF薄板模型中。该程序涉及完整的风力涡轮机叶片结构，叶片根部以及具有不均匀和扭曲性质的叶片跨度区域。结果，在弦向和跨度两个方向上都出现了坡度不连续性问题，因此在动态仿真中出现了数值误差。本文研究了建模斜率不连续性的方法，这些方法是由于叶片上横截面布局的变化而引起的。所开发的方法适用于梯度不足的薄板元件，以解决结构的不连续性。另外，用ANCF和经典的有限元方法精确地表达了空气动力载荷，并检查了这种叶片的空气动力特性。获得了不同工作条件下的静态和动态解决方案，并将结果与​​使用ANSYS代码获得的结果进行了比较。总结并讨论了在大型风力发电机叶片建模中使用ANCF的局限性和优点。给出了有关大旋转，大变形风力涡轮机叶片的数值示例，并给出了动力学设计（DFD）程序。

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