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This study evaluates the wedged Gurney Flap (GF) on a three- straight-bladed Vertical Axis Wind Turbine (VAWT) using Computational Fluid Dynamics (CFD) simulations. The analysis considers the rotating effect of the blades at three different Tip Speed Ratios (TSRs) corresponding to low, medium, and high ranges. A hybrid RANS-LES model, specifically the stress- blended eddy simulation with transition shear-stress transport turbulence model, is employed for the simulations. The results indicate that the wedged GF does not provide significant performance enhancements for the VAWT at most TSR ranges, contrary to the findings in studies focused on stationary aerofoils. Specifically, it is observed that the wedged GF, only improves the power coefficient of the VAWT with GF at low TSR ranges by approximately 3.402% compared to the VAWT with the original GF shape. However, at medium and high TSR ranges, the wedged GF does not exhibit the capability to enhance the VAWT's performance compared to the original GF shape.

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Wedged Gurney Flap for Performance Improvement of Vertical Axis Wind Turbines

  • 会议论文

  • 发表日期：

    2025年

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  • Taurista Perdana Syawitri,
  • Yufeng Yao,
  • Jun Yao,
  • Budi Chandra,
  • Ummi Kultsum

摘要

This study evaluates the wedged Gurney Flap (GF) on a three- straight-bladed Vertical Axis Wind Turbine (VAWT) using Computational Fluid Dynamics (CFD) simulations. The analysis considers the rotating effect of the blades at three different Tip Speed Ratios (TSRs) corresponding to low, medium, and high ranges. A hybrid RANS-LES model, specifically the stress- blended eddy simulation with transition shear-stress transport turbulence model, is employed for the simulations. The results indicate that the wedged GF does not provide significant performance enhancements for the VAWT at most TSR ranges, contrary to the findings in studies focused on stationary aerofoils. Specifically, it is observed that the wedged GF, only improves the power coefficient of the VAWT with GF at low TSR ranges by approximately 3.402% compared to the VAWT with the original GF shape. However, at medium and high TSR ranges, the wedged GF does not exhibit the capability to enhance the VAWT's performance compared to the original GF shape.