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Savonius rotor carries huge potential as standalone power generation device chiefly due to its simplicity and high-torque characteristics. However, several undesirable characteristics hinder its commercial adaptation. One such characteristic is generation of negative torque by returning blade. To overcome this drawback, many techniques have been adopted, and one such technique is using slit or vent. In the paper, the performance analysis is carried out numerically using CFD approach and comparison between conventional semi-circular rotor, rotor equipped with capped vents and slits is carried out. As the performance of rotor is sensitive to vent location, two vent locations are selected, viz. 135° and 120° blade angle (β). Vent gaps, viz. 0.02D, 0.03D, and 0.04D, are chosen for analysis. Slit is analyzed at β = 120° and gap width of 0.03D and 0.04D. The probable physics related to flow around the rotor is discussed to analyze the reasons behind the obtained results. It is found that slit and vents deteriorate the performance ( \({C}_{\text{P}} and {C}_{T}\) values) compared to conventional Savonius rotor at all mentioned locations and gap sizes. Slit and vent both techniques produce almost similar results in working TSR range. Also, 135° vent location produces better results than 120° location.

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Investigation of Performance of Savonius Rotor, Equipped with Blades Having Slits and Capped Vents

  • 会议论文

  • 发表日期：

    2025年

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  • Ath S. Singhal,
  • R. N. Patel,
  • S. V. Jain,
  • Rohan Pathak

摘要

Savonius rotor carries huge potential as standalone power generation device chiefly due to its simplicity and high-torque characteristics. However, several undesirable characteristics hinder its commercial adaptation. One such characteristic is generation of negative torque by returning blade. To overcome this drawback, many techniques have been adopted, and one such technique is using slit or vent. In the paper, the performance analysis is carried out numerically using CFD approach and comparison between conventional semi-circular rotor, rotor equipped with capped vents and slits is carried out. As the performance of rotor is sensitive to vent location, two vent locations are selected, viz. 135° and 120° blade angle (β). Vent gaps, viz. 0.02D, 0.03D, and 0.04D, are chosen for analysis. Slit is analyzed at β = 120° and gap width of 0.03D and 0.04D. The probable physics related to flow around the rotor is discussed to analyze the reasons behind the obtained results. It is found that slit and vents deteriorate the performance ( \({C}_{\text{P}} and {C}_{T}\) values) compared to conventional Savonius rotor at all mentioned locations and gap sizes. Slit and vent both techniques produce almost similar results in working TSR range. Also, 135° vent location produces better results than 120° location.