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<p>A hybrid Darrieus–Savonius wind turbine is an innovative form of vertical axis wind turbine (VAWT). By combining these two types of rotors, the turbine can achieve greater power efficiency and better self-starting capabilities. This study investigates the performance of a hybrid Darrieus–Savonius rotor under various operating conditions. It numerically evaluates the effects of the radius proportion between the Savonius and Darrieus rotors (RP) and the rotor’s mounting angle on power output, using a two-dimensional computational model that simulates unsteady, turbulent, and incompressible flow at different tip-speed ratios (TSRs). The analysis considers three radius proportions (RP) of 0.2, 0.25, and 0.33, along with three mounting angles (θ) of 0°, 45°, and 90°. The numerical results are validated by comparing them with data from existing experimental and numerical studies. The study also analyzes the flow field characteristics, such as velocity and pressure contours, around the hybrid turbine designs. The findings show that the mounting angle plays a crucial role in determining the power coefficient, with the 45° angle producing the highest power coefficient among the angles tested. Additionally, the ideal radius proportion optimizes the power coefficient for both the Savonius and Darrieus rotors at the rated TSR.</p>

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A computational assessment of adjusting the radius ratio and attachment angle on the performance of hybrid vertical axis wind turbines of Darrieus and Savonius designs

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • Mahmoud H. Abdel-razak,
  • Mohamed Emam,
  • Hamdy Hassan

摘要

A hybrid Darrieus–Savonius wind turbine is an innovative form of vertical axis wind turbine (VAWT). By combining these two types of rotors, the turbine can achieve greater power efficiency and better self-starting capabilities. This study investigates the performance of a hybrid Darrieus–Savonius rotor under various operating conditions. It numerically evaluates the effects of the radius proportion between the Savonius and Darrieus rotors (RP) and the rotor’s mounting angle on power output, using a two-dimensional computational model that simulates unsteady, turbulent, and incompressible flow at different tip-speed ratios (TSRs). The analysis considers three radius proportions (RP) of 0.2, 0.25, and 0.33, along with three mounting angles (θ) of 0°, 45°, and 90°. The numerical results are validated by comparing them with data from existing experimental and numerical studies. The study also analyzes the flow field characteristics, such as velocity and pressure contours, around the hybrid turbine designs. The findings show that the mounting angle plays a crucial role in determining the power coefficient, with the 45° angle producing the highest power coefficient among the angles tested. Additionally, the ideal radius proportion optimizes the power coefficient for both the Savonius and Darrieus rotors at the rated TSR.