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February 5, 2026Scientific ReportsOpen Access

Enhancing start-up and torque in Darrieus VAWTs through a novel plain gurney flap design

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Authors

WEWallaaldin Abass EltayebJSJarupula SomlalMSMustafa SirElkhatim

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Overview

Evaluates aerodynamic performance enhancements in Darrieus VAWTs, suggesting improved power generation capabilities.

Key Points

  • The aim is to improve aerodynamic efficiency and self-starting torque in Darrieus-type VAWTs under low wind conditions.
  • Conducted 2D URANS simulations using SST k-ω model across various TSR and Reynolds number ranges.
  • Tested different flap modifications: Plain Flap, Gurney Flap, and hybrid Plain Gurney Flap on NACA 0015 aerofoil.
  • Validated simulation results through prototype testing.
  • Optimal Plain Flap configuration improved mean coefficient of moment by 30-40% and power coefficient by 40%.
  • At low TSR, Plain Flap showed robust performance while Gurney Flap incurred downwind losses.
  • Prototype testing confirmed an increase in shaft speed by up to 51% at a wind speed of 5.5 m/s.

Cite This Study

Eltayeb et al. (2026) studied this question.

synapsesocial.com/papers/69843583f1d9ada3c1fb4501https://doi.org/10.1038/s41598-026-38485-9
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