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Insight into stall delay and computation of 3D sectional aerofoil characteristics of NREL phase VI wind turbine using inverse BEM and improvement in BEM analysis accounting for stall delay effect

机译：利用逆BEM深入了解NREL VI阶段风力涡轮机的失速延迟和3D截面翼型特性，并改进了考虑到失速延迟效应的BEM分析

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In this paper, analysis of stall delay phenomenon for the NREL Phase VI wind turbine is done in order to improve Blade Element Momentum (BEM) method. The current study includes different proposals for extrapolation of 2D aerofoil characteristics for S809 aerofoil at higher angles of attack and their implementation in BEM analysis and comparison with experiment results. Also four existing stall delay corrections models are examined. In general BEM with no stall delay models did not account for stall delay and BEM with existing stall delay models result in over-prediction of lift coefficients at inboard sections of the blade at higher wind speed. Improved inverse BEM method is developed here to compute 3D aerofoil characteristics. In addition to five radial locations as described in the NREL/NASA Ames test analysis, thirteen additional radial locations are considered for a better understanding of stall delay. A new BEM model with the local radius effect for aerofoil characteristics (other than as a function of Reynolds number and angle of attack only) is proposed. Implementation of the new model showed a good agreement with aerofoil characteristics distribution along the blade span. It further revealed a good matching for overall thrust comparison and promising comparison in power computation. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文对NREL VI期风力发电机的失速延迟现象进行了分析，以改进叶片元素动量（BEM）方法。当前的研究包括在高攻角下外推S809机翼的2D机翼特性的不同建议，以及在BEM分析中的实现以及与实验结果的比较。还检查了四个现有的失速延迟校正模型。通常，没有失速延迟模型的BEM不能解决失速延迟，具有现有失速延迟模型的BEM会导致在较高风速下叶片内侧部分的升力系数过高预测。此处开发了改进的逆BEM方法来计算3D翼型特性。除了NREL / NASA Ames测试分析中所述的五个径向位置外，还考虑了十三个其他径向位置，以更好地了解失速延迟。提出了一种新的BEM模型，该模型具有机翼特性的局部半径效应（仅作为雷诺数和迎角的函数）。新模型的实施与沿叶片跨度的翼型特性分布显示出良好的一致性。它进一步揭示了整体推力比较和功率计算中有希望的比较的良好匹配。 （C）2016 Elsevier Ltd.保留所有权利。

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