Savonius wind turbines are drag-based devices that are well known for their ease of use, high starting torque, and appropriateness for applications with low wind speeds. The Savonius Horizontal Axis Wind Turbine (SHAWT) is the result of recent research interest in reorienting Savonius rotors along a horizontal axis, although conventional Savonius rotors are primarily configured as vertical-axis wind turbines (VAWTs). The goal of this configuration is to combine better structural integration and alignment flexibility with the self-starting properties of drag-driven rotors. The performance potential and aerodynamic behaviour of SHAWTs, however, have not yet been thoroughly examined. The experimental and numerical research on Savonius-based horizontal-axis designs is critically reviewed in this paper, with a focus on non-traditional blade geometries, overlap ratio modification, flow-guiding techniques, and hybrid configurations. Twenty peerreviewed studies in all are examined, with uploaded foundational papers given priority and updated with new research. Non-traditional SHAWT designs can increase torque smoothness and operational stability, according to comparative analysis, but power coefficient improvements are still small and heavily dependent on operating conditions. Important research gaps concerning real-world viability, standardised testing, and scalability are noted.
G et al. (Thu,) studied this question.