Abstract
In this paper, we attempted to measure the effect of Bach’s section, which presents a high-power coefficient in the standard Savonius model, on the performance of the helical Savonius wind turbine, by observing the parameters affecting turbine performance. Assessment methods based on the tip speed ratio, torque variation, flow field characterizations, and the power coefficient are performed. The present issue was stimulated using the turbulence model SST (k- ω) at 6, 8, and 10 m/s wind flow velocities via COMSOL software. Numerical simulation was validated employing previous articles. Outputs demonstrate that Bach-primary and Bach-developed wind turbine models have less flow separation at the spoke-end than the simple helical Savonius model, ultimately improving wind turbines’ total performance and reducing spoke-dynamic loads. Compared with the basic model, the Bach-developed model shows an 18.3% performance improvement in the maximum power coefficient. Bach’s primary model also offers a 12.4% increase in power production than the initial model’s best performance. Furthermore, the results indicate that changing the geometric parameters of the Bach model at high velocities (in turbulent flows) does not significantly affect improving performance.
Highlights
Energy has an essential role in solving problems to achieve sustainability and development of different countries [1]
Savonius wind turbines are extensively employed in small scale such as domestic and residential power generation; what causes the superiority of the helical Savonius wind turbine relative to its conventional model is that the helical model has a positive torque coefficient for all rotor angles that this feature causes to have better performance compared to conventional Savonius wind turbines
This study evaluated the wind turbine performance improvement at 6, 8, and 10 m/s velocities by changing the Bach section’s geometrical dimensions compared to the simple helical Savonius model for the different tip speeds ratios in numerical fluid dynamic environments
Summary
Energy has an essential role in solving problems to achieve sustainability and development of different countries [1]. In a comprehensive study conducted by Akwa et al [16] on Savonius wind turbine structure, different kinds of Savonius wind turbines were studied in detail Their advantages and disadvantages and wind flow effect on performance were identified. Jeon et al [19] studied the effects of changing the shape of the first and last sheets of helical turbine spokes on wind turbine performance They concluded that the last circular sheets with more than one coverage coefficient provide the best option in increasing efficiency for this wind turbine model. The decision was made to measure helical Savonius wind turbines by considering effective parameters on the performance of the turbine (the effect of rotor upper and lower sheets, helical vertical-axis turbine torsion angle, and Bach’s section effect) and reporting the improvement of helical Savonius wind turbines compared with the circular spiral model
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