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<p>Continuous improvement of small-scale wind turbines is vital for sustainable electricity generation in both urban and non-urban areas. This study focuses on the power characteristics of a three-bladed Darrieus wind turbine with auxiliary blades using computational fluid dynamics. The auxiliary blades are tested at different attachment angles (<i>ψ</i>) within the conventional three-bladed Darrieus rotor- 0°, 15°, 30°, 45°, and 60°. The computations are carried out at three wind speeds (<i>U</i>) of 7, 10, and 14 m/s, along with different tip speed ratios (TSRs) ranging from 0.5 to 2.5. The computer code is validated against existing data for a conventional three-bladed Darrieus rotor, and good agreement is achieved. The study finds that even a slight change in the attachment angle significantly impacts the wind flow around the rotor, dead band extension, and power characteristics. After considering and analyzing the parameters, it is concluded that a hybrid rotor with a zero attachment angle under TSR = 1.5 provides maximum power coefficients of 0.2713, 0.3265, and 0.3607, with 7.02%, 18.72%, and 18.26% improvements compared to the conventional rotor at <i>U</i> = 7, 10, and 14 m/s, respectively.</p>

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Impacts of Auxiliary Blades on the Performance of a Three-Bladed Darrieus Wind Turbine

  • 期刊论文

  • 发表日期：

    2025年8月18日

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  • Milad Mohammadnejad,
  • Rahim Hassanzadeh

摘要

Continuous improvement of small-scale wind turbines is vital for sustainable electricity generation in both urban and non-urban areas. This study focuses on the power characteristics of a three-bladed Darrieus wind turbine with auxiliary blades using computational fluid dynamics. The auxiliary blades are tested at different attachment angles (ψ) within the conventional three-bladed Darrieus rotor- 0°, 15°, 30°, 45°, and 60°. The computations are carried out at three wind speeds (U) of 7, 10, and 14 m/s, along with different tip speed ratios (TSRs) ranging from 0.5 to 2.5. The computer code is validated against existing data for a conventional three-bladed Darrieus rotor, and good agreement is achieved. The study finds that even a slight change in the attachment angle significantly impacts the wind flow around the rotor, dead band extension, and power characteristics. After considering and analyzing the parameters, it is concluded that a hybrid rotor with a zero attachment angle under TSR = 1.5 provides maximum power coefficients of 0.2713, 0.3265, and 0.3607, with 7.02%, 18.72%, and 18.26% improvements compared to the conventional rotor at U = 7, 10, and 14 m/s, respectively.