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Title: Computational fluid dynamics investigations over conventional and modified Savonius wind turbines
Authors: Rizk, Maysa'a
Nasr, Karim 
Affiliations: Department of Mechanical Engineering 
Keywords: Coefficient of moment
Coefficient of performance
Extended surfaces
Mini blades
Savonius rotor
Wind turbine
Issue Date: 2023-06
Publisher: Elsevier
Part of: Heliyon
Volume: 9
Issue: 6
Wind turbines are devices that convert the kinetic energy present in the wind into clean, sustainable, and effectively renewable energy that could be used to generate electricity. A Savonius wind turbine is a drag-based vertical axis wind turbine (VAWT) that is known to have low noise levels and good starting characteristics even at low wind speeds. Its disadvantage lies in its low efficiency or low coefficient of performance. Exploring ways to increase the coefficient of performance, numerical investigations were carried out on different modified Savonius VAWT configurations, having different curvatures, different overlap percentages, added mini blades, and fitted out with extended surfaces. These investigations were computationally executed on Ansys Fluent™ using the sliding mesh technique. Two-dimensional simulations, on a Bach blade curvature with zero overlap as well as a half-circle and a polynomial curvature with overlap, showed that for a wind speed of 5 m/s and a tip speed ratio of 0.8, the half-circle blade curvature having an overlap of 20% performs best, yielding the highest net (average) coefficient of moment, equal to 0.3065. Results also show that the addition of mini blades to this optimal configuration produces a slight improvement in the coefficient of moment. However, the addition of extended surfaces onto the blades caused the minimum coefficient of moment to be a substantial negative value and thus resulting in a much lower value for the turbine's average coefficient of moment.
ISSN: 24058440
DOI: 10.1016/j.heliyon.2023.e16876
Ezproxy URL: Link to full text
Type: Journal Article
Appears in Collections:Department of Mechanical Engineering

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