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Savonius vertical axis wind turbine (VAWT) is a promising option due to its ease of maintenance, low production costs, and ability to self-start at low wind speeds. The effects of variation in the outer plate diameter of an omnidirectional deflector on the performance of Bach rotor at a tip speed ratio (TSR) of 1.0 are investigated in the present 3D study. The computational methodology involves Unsteady Reynolds-Averaged Navier–Stokes equations and the SST k-ω turbulence model to simulate the three-dimensional flow around the blades. The results show a deviation of 3.5% in the power coefficient for TSR 1.0 compared to the reported experimental data, thus validating the present computational approach. It is observed that variation in the outer plate diameter of the deflector system significantly affects the power coefficient. The peak power coefficient of 0.283 is observed at an outer plate diameter of 2.2 times the rotor diameter. Overall, this study provides valuable insights into enhancing the performance of Savonius VAWT using an omnidirectional deflector with an optimized outer plate diameter. This research contributes to the development of efficient off-grid energy solutions for remote locations with limited power connectivity.

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Performance Enhancement of Savonius Bach Wind Turbine Rotor Using Axisymmetric Omnidirectional Deflector with Variation in Outer Plate Diameter

  • 会议论文

  • 发表日期：

    2025年

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  • Shivam Singh Tomar,
  • Anupam Dewan,
  • Tej Pratap Singh

摘要

Savonius vertical axis wind turbine (VAWT) is a promising option due to its ease of maintenance, low production costs, and ability to self-start at low wind speeds. The effects of variation in the outer plate diameter of an omnidirectional deflector on the performance of Bach rotor at a tip speed ratio (TSR) of 1.0 are investigated in the present 3D study. The computational methodology involves Unsteady Reynolds-Averaged Navier–Stokes equations and the SST k-ω turbulence model to simulate the three-dimensional flow around the blades. The results show a deviation of 3.5% in the power coefficient for TSR 1.0 compared to the reported experimental data, thus validating the present computational approach. It is observed that variation in the outer plate diameter of the deflector system significantly affects the power coefficient. The peak power coefficient of 0.283 is observed at an outer plate diameter of 2.2 times the rotor diameter. Overall, this study provides valuable insights into enhancing the performance of Savonius VAWT using an omnidirectional deflector with an optimized outer plate diameter. This research contributes to the development of efficient off-grid energy solutions for remote locations with limited power connectivity.