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Unstable aerodynamic performance of a very thick wind turbine airfoil CAS-W1-450

Author

Listed:
  • Zhang, Lei
  • Li, Xingxing
  • Li, Shuang
  • Bai, Jingyan
  • Xu, Jin

Abstract

The flow separation of very thick wind turbine airfoils always causes dynamic performance of the airfoils. The unstable aerodynamic performance of the 45% thick airfoil, CAS-W1-450, was studied in a wind tunnel at Re = 1.0 × 10ˆ6. Two types of aerodynamic accessories, i.e., vortex generators (VGs) and M-type trailing-edge device (M-plate) were used to change the surface condition. And then, the effects of the accessories on the unsteady separation were studied. The results show that the thick airfoil has serious three-dimensional boundary-layer separation at large angles of attack. Bifurcation appears typically near stall condition because the time-averaged flow mode cannot maintain a single state and the pressure signals obviously jump/drop from one value to another. As a result, the testing data near stall and at some of other conditions scatters a lot. Measurements of VGs and M-plate show that VGs can delay or eliminate both stall and bifurcation on the airfoil, but M-plate has less effect on the bifurcation because perturbations downstream have less effect on upstream flow. As for flow conditions at very large angles of attack, it is found that the time-averaged aerodynamic performance varies less and is repeatable, although separation is strongly unsteady at very large angles of attack.

Suggested Citation

  • Zhang, Lei & Li, Xingxing & Li, Shuang & Bai, Jingyan & Xu, Jin, 2019. "Unstable aerodynamic performance of a very thick wind turbine airfoil CAS-W1-450," Renewable Energy, Elsevier, vol. 132(C), pages 1112-1120.
    • Handle: RePEc:eee:renene:v:132:y:2019:i:c:p:1112-1120
    DOI: 10.1016/j.renene.2018.08.086
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    Cited by:

    1. Bhavsar, Het & Roy, Sukanta & Niyas, Hakeem, 2023. "Aerodynamic performance enhancement of the DU99W405 airfoil for horizontal axis wind turbines using slotted airfoil configuration," Energy, Elsevier, vol. 263(PA).
    2. Ali Awada & Rafic Younes & Adrian Ilinca, 2021. "Review of Vibration Control Methods for Wind Turbines," Energies, MDPI, vol. 14(11), pages 1-35, May.
    3. Wu, Guangxing & Zhang, Chaoyu & Cai, Chang & Yang, Ke & Shi, Kezhong, 2020. "Uncertainty prediction on the angle of attack of wind turbine blades based on the field measurements," Energy, Elsevier, vol. 200(C).
    4. Wenyan Li & Yuxuan Xiong & Guoliang Su & Zuyang Ye & Guowu Wang & Zhao Chen, 2023. "The Aerodynamic Performance of Horizontal Axis Wind Turbines under Rotation Condition," Sustainability, MDPI, vol. 15(16), pages 1-15, August.

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