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<p>The main disadvantage of the Savonius wind rotor is the low efficiency in converting the kinetic energy of the wind into useful power. This drawback limits the use and widespread adoption of the turbine. This study aims to investigate the aerodynamic performance of a bio-inspired, dolphin-shaped Savonius wind turbine using CFD simulation. The CFD simulation was conducted for the two-dimensional rotor using the SST k–ω turbulence to evaluate the influence of four distance-ratio values (1.0, 0.9, 0.8, and 0.7) on torque and power coefficients at different values of tip speed ratio. The results demonstrated that the optimal design for the proposed dolphin-shaped Savonius wind turbine corresponds to a distance ratio of 0.7. The best configuration achieves a maximum power coefficient of 0.26 at a tip speed ratio of 0.5, representing a 63% improvement compared to the conventional rotor under the same operating conditions. This enhancement is attributed to the reduction in the wake width and in the peak vortex core velocity, and in the increment in the positive pressure difference between the advancing the returning blades.</p>

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Aerodynamics and Performance Evaluation of a Bio-Inspired Dolphin-Shaped Savonius Wind Rotor: A CFD Study

  • 期刊论文

  • 发表日期：

    2026年5月17日

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  • Mohanad Al-Ghriybah,
  • Abdullah Mohammad Abdullah

摘要

The main disadvantage of the Savonius wind rotor is the low efficiency in converting the kinetic energy of the wind into useful power. This drawback limits the use and widespread adoption of the turbine. This study aims to investigate the aerodynamic performance of a bio-inspired, dolphin-shaped Savonius wind turbine using CFD simulation. The CFD simulation was conducted for the two-dimensional rotor using the SST k–ω turbulence to evaluate the influence of four distance-ratio values (1.0, 0.9, 0.8, and 0.7) on torque and power coefficients at different values of tip speed ratio. The results demonstrated that the optimal design for the proposed dolphin-shaped Savonius wind turbine corresponds to a distance ratio of 0.7. The best configuration achieves a maximum power coefficient of 0.26 at a tip speed ratio of 0.5, representing a 63% improvement compared to the conventional rotor under the same operating conditions. This enhancement is attributed to the reduction in the wake width and in the peak vortex core velocity, and in the increment in the positive pressure difference between the advancing the returning blades.