Optimization of the Power Coefficient of a Savonius Wind Turbine by Changing the Shape of Blades
E. M. Abu Khers, M., Fouad, M., Halawa, T. (2022). Optimization of the Power Coefficient of a Savonius Wind Turbine by Changing the Shape of Blades. EKB Journal Management System, 51(1), 27-42. doi: 10.21608/erjsh.2022.224260
Medhat E. M. Abu Khers; Mahmoud Fouad; Taher Halawa. "Optimization of the Power Coefficient of a Savonius Wind Turbine by Changing the Shape of Blades". EKB Journal Management System, 51, 1, 2022, 27-42. doi: 10.21608/erjsh.2022.224260
E. M. Abu Khers, M., Fouad, M., Halawa, T. (2022). 'Optimization of the Power Coefficient of a Savonius Wind Turbine by Changing the Shape of Blades', EKB Journal Management System, 51(1), pp. 27-42. doi: 10.21608/erjsh.2022.224260
E. M. Abu Khers, M., Fouad, M., Halawa, T. Optimization of the Power Coefficient of a Savonius Wind Turbine by Changing the Shape of Blades. EKB Journal Management System, 2022; 51(1): 27-42. doi: 10.21608/erjsh.2022.224260

Optimization of the Power Coefficient of a Savonius Wind Turbine by Changing the Shape of Blades

Engineering Research Journal (Shoubra)
Volume 51, Issue 1, January 2022, Page 27-42  XML PDF (2.01 MB)
Document Type: Research articles
DOI: 10.21608/erjsh.2022.224260
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Authors
Medhat E. M. Abu Khers1; Mahmoud Fouad2; Taher Halawa3
1R&D Department, Aircraft Factory - Arab Organization for Industrialization (AOI), Helwan, Egypt.
2Professor, Mechanical Power Engineering Department, Cairo University, Giza, Egypt.
3Associate Professor, Mechanical Power Engineering Department, Cairo University, Giza, Egypt
Abstract
There is a growing necessity to increase the efficiency of wind turbines especially the vertical axis
type. One of the challenges is to enhance the performance of Savonius wind turbines. Several methods have been
used for improving the power extraction efficiency through making some modifications in the shape of blades.
There is an important raised question about the best shape of blades that will maximize the power coefficient of
the Savonius wind turbine. This paper tries to answer this question by introducing an optimization analysis using
the optimal control numerical approach. Results indicated that the most important part of the blade that
influences the turbine efficiency is close to the tip radius of the blades. The combined effect of making gradual
slope of the blade profile and directing the blade curvature to be slightly outward near the tip region was
impressive. The flow separation point was shifted. The pressure distribution on blades surfaces was improved
and thus, the torque was increased. The third proposed design achieves an increase of 71% in the value of the
power coefficient corresponding to a free stream wind speed of 6 m/s compared to the conventional semi-circle
design.
Keywords
CFD, Savonius style wind turbine; Power coefficient; Torque coefficient; Tip speed ratio
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