Abstract—The rotor is a critical component in converting  kinetic energy into electrical energy in the turbine. There  are many types of turbines, one of which is the Savonius  Turbine, a kind of cross-flow turbine. In recent years,  research on improving the performance of the Savonius  turbine has continued to develop. Several factors that affect  the performance of the Savonius turbine are external factors,  geometry, and materials. One of the Savonius turbine  performances is influenced by the rotor geometry. Several  studies have shown that modification of the geometry of the  Savonius rotor can improve turbine performance. Some of  the changes made are variations in aspect ratio, overlap  ratio, the shape of a blade, number of blades, and multistage.  This research is a mini-review of the geometry  modifications that influence the performance of the  Savonius turbine. This study aims to show the geometric  factors that influence the performance of Savonius and  compare the magnitude of these factors' Influence in  increasing the Savonius turbine's performance. Reviews  show that the Aspect Ratio is directly proportional to  performance. Overlap variation of 0 to 0.3 has resulted in  the best performance on the Savonius turbine, but other  factors also influence this factor. The modified shape of the  blade provides an increase of 8% - 25%. Multi-Stage on the  Savonius can be a combination factor with other factors to  maximize the performance of the Savonius rotor. The  number of blades that have resulted in the best performance  and stability against other factors is two-blades and threeblades. 

Index Terms—Savonius, turbine, geometry factor,  coefficient of power 

Cite: Dandun Mahesa Prabowoputra and Aditya Rio Prabowo, "Effect of Geometry Modification on Turbine Performance: Mini-Review of Savonius Rotor," International Journal of Mechanical Engineering and Robotics Research, Vol. 11, No. 10, pp. 777-783, October 2022. DOI: 10.18178/ijmerr.11.10.777-783

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