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Stall control on the wind turbine airfoil via the single and dual-channel of combining bowing and suction technique

Author

Listed:
  • Sun, Yukun
  • Qian, Yaoru
  • Gao, Yang
  • Wang, Tongguang
  • Wang, Long

Abstract

Based on the single-channel jet control strategy with a suction slot on the upper surface and injection slots near the trailing edge on the lower surface, proposed in this work is a novel flow control technique, known as the dual-channel jet, which amalgamates the beneficial aspects of leading-edge suction and a suction slot positioned downstream of the airfoil's maximum thickness position. To demonstrate the superior aerodynamic characteristics of the dual-channel over the single-channel, comprehensive comparisons of three distinct control strategies are made with two jet momentum coefficients employed on the S809 airfoils. Simulations using Reynolds-averaged Navier-Stokes with a transitional SST turbulence model are performed, showing that the position of a suction slot in the single-channel significantly impacts its ability to inhibit separation, while the dual-channel jet facilitates a fuller boundary layer velocity profile and a posterior shift in the stagnation point, outperforming the single-channel approach in removing low-momentum fluid and increasing the airfoil virtual camber. In the case with a jet strength of 0.004 and pitching oscillation, compared to the clean airfoil, the dual-channel achieves a remarkable 84.21 % increase in the lift coefficient at 18.1°, and the control efficiency can further be enhanced with the momentum coefficient increased.

Suggested Citation

  • Sun, Yukun & Qian, Yaoru & Gao, Yang & Wang, Tongguang & Wang, Long, 2024. "Stall control on the wind turbine airfoil via the single and dual-channel of combining bowing and suction technique," Energy, Elsevier, vol. 290(C).
    • Handle: RePEc:eee:energy:v:290:y:2024:i:c:s0360544223036186
    DOI: 10.1016/j.energy.2023.130224
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    References listed on IDEAS

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    5. Nabhani, Ahmad & Tousi, Navid M. & Coma, Martí & Bugeda, Gabriel & Bergadà, Josep M., 2025. "Large-scale horizontal axis wind turbine aerodynamic efficiency optimization using active flow control and synthetic jets," Energy, Elsevier, vol. 319(C).

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