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Numerical investigation into rotational augmentation with passive vortex generators on the NREL Phase VI blade

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  • Zhu, Chengyong
  • Chen, Jie
  • Qiu, Yingning
  • Wang, Tongguang

Abstract

Passive vortex generators (VGs) have been widely used on wind turbines to improve the aerodynamic power. Nevertheless, most studies of VGs are conducted on flat plates and airfoils rather than rotating blades. The effect of VGs on rotational blade flow therefore remains unclear. This paper presents a comparative study between the NREL S809 airfoil flow and NREL Phase VI blade flow, to highlight rotational augmentation with VGs. There are 36 pairs of rectangular VGs installed at about 20% c between 25% and 50% spans of the blade. Fully-resolved RANS simulations are used to identify the airfoil and blade flow characteristics with VGs. Although VGs greatly increase the maximum lift coefficient of airfoil by almost 60%, they cause unexpected decreases in aerodynamic forces on the inboard blade. This is mainly because VGs can reduce the radial flow and thus undermine rotational augmentation. Furthermore, increasing VG size amplifies the VG effect on radial flow and enlarges the separation bubble at 30% span from 43% c to 57% c in height. Positioning VGs in a skewed layout, however, effectively diminishes this negative VG effect and reduces the separation bubble height to 28% c. These findings indicate a huge difference between the airfoil flow and blade flow with VGs due to rotational effects. This work might deepen the understanding of rotational augmentation with VGs on a rotating blade.

Suggested Citation

  • Zhu, Chengyong & Chen, Jie & Qiu, Yingning & Wang, Tongguang, 2021. "Numerical investigation into rotational augmentation with passive vortex generators on the NREL Phase VI blade," Energy, Elsevier, vol. 223(C).
    • Handle: RePEc:eee:energy:v:223:y:2021:i:c:s0360544221003388
    DOI: 10.1016/j.energy.2021.120089
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    References listed on IDEAS

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    1. Chengyong Zhu & Tongguang Wang & Jie Chen & Wei Zhong, 2020. "Effect of Single-Row and Double-Row Passive Vortex Generators on the Deep Dynamic Stall of a Wind Turbine Airfoil," Energies, MDPI, vol. 13(10), pages 1-13, May.
    2. Chengyong Zhu & Tongguang Wang & Jianghai Wu, 2019. "Numerical Investigation of Passive Vortex Generators on a Wind Turbine Airfoil Undergoing Pitch Oscillations," Energies, MDPI, vol. 12(4), pages 1-19, February.
    3. Zhu, Chengyong & Qiu, Yingning & Wang, Tongguang, 2021. "Dynamic stall of the wind turbine airfoil and blade undergoing pitch oscillations: A comparative study," Energy, Elsevier, vol. 222(C).
    4. Zhu, Chengyong & Chen, Jie & Wu, Jianghai & Wang, Tongguang, 2019. "Dynamic stall control of the wind turbine airfoil via single-row and double-row passive vortex generators," Energy, Elsevier, vol. 189(C).
    5. Wang, Haipeng & Zhang, Bo & Qiu, Qinggang & Xu, Xiang, 2017. "Flow control on the NREL S809 wind turbine airfoil using vortex generators," Energy, Elsevier, vol. 118(C), pages 1210-1221.
    6. Manolesos, M. & Papadakis, G. & Voutsinas, S.G., 2020. "Revisiting the assumptions and implementation details of the BAY model for vortex generator flows," Renewable Energy, Elsevier, vol. 146(C), pages 1249-1261.
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    Cited by:

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    2. Jiang, Ruifang & Zhao, Zhenzhou & Liu, Huiwen & Wang, Tongguang & Chen, Ming & Feng, Junxin & Wang, Dingding, 2022. "Numerical study on the influence of vortex generators on wind turbine aerodynamic performance considering rotational effect," Renewable Energy, Elsevier, vol. 186(C), pages 730-741.
    3. Zhang, Dongqin & Liu, Zhenqing & Li, Weipeng & Hu, Gang, 2023. "LES simulation study of wind turbine aerodynamic characteristics with fluid-structure interaction analysis considering blade and tower flexibility," Energy, Elsevier, vol. 282(C).
    4. Ji, Baifeng & Zhong, Kuanwei & Xiong, Qian & Qiu, Penghui & Zhang, Xu & Wang, Liang, 2022. "CFD simulations of aerodynamic characteristics for the three-blade NREL Phase VI wind turbine model," Energy, Elsevier, vol. 249(C).

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