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Aerodynamic modeling of wind turbine airfoil concerning dynamic stall and Gurney flap

考虑动态失速和Gurney襟翼的风力机翼型气动建模

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Abstract

The prediction of the unsteady aerodynamic load on an airfoil has frequently used the Leishman-Beddoes (L-B) model. Meanwhile, flow control techniques could change the flow around the blade, increase the effectiveness of wind energy conversion, and reduce the wind load. However, there have been a limited number of investigations examining this semi-empirical model taking into account the effects of such aerodynamic add-ons. As a result, this study intends to extend and modify the L-B model so that it can predict the unsteady aerodynamic characteristics of a wind turbine airfoil equipped with a Gurney flap. According to the unsteady aerodynamic changes of the Gurney flap during the oscillation period, the prediction module was proposed by the circulation changes, as well as characteristics of vortex generation and shedding traveling on the airfoil surface. These predicting results were preliminarily confirmed through a wind tunnel experiment, which illustrated that this approach has high practical potential. Nevertheless, the aerodynamic coefficients slightly deviated in the deep stall region. Adopting such a wind turbine optimization technology might improve the prediction and evaluation of the aerodynamic characteristics of a flapped airfoil under varying turbulent flow conditions.

摘要

Leishman-Beddoes模型(L-B模型)常被应用于动态失速时的非定常载荷预测. 同时, 加装气动附件的方法可以改善叶片周围的绕 流状况, 提高能量转换效率并减小载荷. 然而, 目前考虑此类气动附加件影响的动态失速半经验模型气动力预测的研究还较少. 为此, 本研究基于L-B模型进行扩展和修正, 使其能够预测加装Gurney襟翼的风力机翼型的非定常气动特性. 针对Gurney襟翼在俯仰振荡期 间的非定常气动变化, 即环量变化以及在翼型表面的涡的产生和脱落运动特性, 提出了对应的预测模块. 通过风洞实验的方式对预测 结果进行了初步验证, 表明所述方法具有较高的实用潜力, 但气动系数试验结果在深失速区略有偏差. 通过这种风力机优化技术, 所得 结果有助于更好地理解及评估不同湍流来流工况时加装Gurney襟翼的风力机翼型动态特性变化规律.

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Acknowledgements

This work was supported by the Natural Science Foundation of Jiangsu Higher Education Institutions of China (Grant No. 22KJD480003), and the Curriculum Construction Project of Guangling College, Yangzhou University (Grant No. KCSZ202210).

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Authors and Affiliations

  1. Guangling College, Yangzhou University, Yangzhou, 225000, China

    Junwei Yang  (杨俊伟)

  2. College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou, 225127, China

    Junwei Yang  (杨俊伟), Hua Yang  (杨华) & Xiangjun Wang  (王相军)

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  1. Junwei Yang  (杨俊伟)
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  2. Hua Yang  (杨华)
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  3. Xiangjun Wang  (王相军)
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Contributions

Junwei Yang designed the research, carried out the modeling, tests, and results analysis, and wrote the first draft of the manuscript. Hua Yang and Xiangjun Wang contributed to the study conception and provided a critical review. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Hua Yang  (杨华) or Xiangjun Wang  (王相军).

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On behalf of all the authors, the corresponding author states that there is no conflict of interest.

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Yang, J., Yang, H. & Wang, X. Aerodynamic modeling of wind turbine airfoil concerning dynamic stall and Gurney flap. Acta Mech. Sin. 39, 323056 (2023). https://doi.org/10.1007/s10409-023-23056-x

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