Modeling dynamic stall on wind turbine blades under rotationally augmented flow fields
Modeling dynamic stall on wind turbine blades under rotationally augmented flow fields
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DOI：
10.1002/we.1839
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发表时间：
2016-03
期刊：
影响因子：
4.1
通讯作者：
S. Guntur;N. Sørensen;S. Schreck;Leonardo Bergami
中科院分区：
文献类型：
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作者：
S. Guntur;N. Sørensen;S. Schreck;Leonardo Bergami
本文研究了风力涡轮机叶片内侧部分的两种著名的空气动力学现象：旋转增强和动态失速。该分析使用以下数据进行：（1）国家可再生能源实验室的非定常空气动力学实验第六阶段实验数据，包括轴向操作期间的恒定和连续变桨叶片条件;（2）使用丹麦技术大学的内部流解算器Ellipsys 3D进行的非定常延迟分离涡模拟（DDES）数据;和（3）来自降阶动态失速模型的数据，该模型使用从定常阶段VI实验序列获得的旋转增强定常状态极，而不是传统的二维非旋转数据。这项工作的目的是双重的。首先，通过DDES模拟估计的叶片载荷与N序列实验数据的三个选择情况进行比较，这作为DDES方法的验证。结果表明，在两个研究的三种情况下，两个数据之间的合理协议。其次，将实验得到的升力和力矩极线的动态时间序列与动态失速模型得到的结果进行了比较。这允许研究旋转风力涡轮机上谐波俯仰叶片内侧部分的失速现象与二维流中经典动态失速表示之间的差异。结果表明，在许多情况下，模型和实验数据之间有很好的定性一致性，这表明，目前的二维动态失速模型中使用的叶片元素动量为基础的气动弹性代码可以提供一个合理的准确表示三维转子空气动力学时，结合使用一个强大的旋转增强模型。版权所有© 2015约翰威利父子有限公司.
This paper presents an investigation of two well-known aerodynamic phenomena, rotational augmentation and dynamic stall, together in the inboard parts of wind turbine blades. This analysis is carried out using the following: (1) the National Renewable Energy Laboratory’s Unsteady Aerodynamics Experiment Phase VI experimental data, including constant as well as continuously pitching blade conditions during axial operation; (2) data from unsteady delayed detached eddy simulations (DDES) carried out using the Technical University of Denmark’s in-house flow solver Ellipsys3D; and (3) data from a reduced order dynamic stall model that uses rotationally augmented steady-state polars obtained from steady Phase VI experimental sequences, instead of the traditional two-dimensional, non-rotating data. The aim of this work is twofold. First, the blade loads estimated by the DDES simulations are compared with three select cases of the N-sequence experimental data, which serves as a validation of the DDES method. Results show reasonable agreement between the two data in two out of three cases studied. Second, the dynamic time series of the lift and the moment polars obtained from the experiments are compared with those from the dynamic stall model. This allowed the differences between the stall phenomenon on the inboard parts of harmonically pitching blades on a rotating wind turbine and the classic dynamic stall representation in two-dimensional flow to be investigated. Results indicated a good qualitative agreement between the model and the experimental data in many cases, which suggests that the current two-dimensional dynamic stall model as used in blade element momentum-based aeroelastic codes may provide a reasonably accurate representation of three-dimensional rotor aerodynamics when used in combination with a robust rotational augmentation model. Copyright © 2015 John Wiley & Sons, Ltd.