Experimental study of the effect of slotted blades on the Savonius wind turbine performance

Wind generation is an alternative to energy generation that is renewable, widely distributed, and environmentally friendly. However, the use of wind energy in certain areas with limited land has constraints for installing large-scale generators; therefore, the concept of micro wind energy generation is an attractive solution to be developed at this time. In this case, the Vertical Axis Wind Turbine (VAWT) is preferred because it is reliable and economically feasible to operate at low wind speeds in all wind directions. In the case of turbine selection, the Savonius turbine is preferred because it has self-starting. Still, in terms of performance, the Darrieus turbine type has better power efficiency than the Savonius type. Besides that, because of their high solidity and heavier weight, drag-based turbines are less preferred. In this study, the combination of the two types of turbines between Savonius and Darrieus was carried out to overcome each type of turbine's shortcomings. In this case, the fiberglass material was chosen because it has reliable properties that increase the turbine's efficiency. The research design used an experimental method by configuring a double-stage Savonius-Darrieus turbine in the wind tunnel. The data was collected by measuring and recording the electric voltage, electric current, and the generator shaft rotation for each variation of the pitch angle at the 0°,5°,10°,15°,20°,25° and 30° blades and with wind speeds at 1.5 m/s up to 5 m/s with 0.1 m/s intervals. The results showed that adding variations in the pitch angle of the Savonius-Darrieus double-stage turbine blade was ineffective because it reduced the electric power generated and the turbine's performance. In this study, the resulting cut-in speed is 3.8 m/s. However, with the addition of variations in the pitch angle, there was a decrease in the value of electric power, power coefficient, and Tip Speed Ratio (TSR), where the maximum values were 3.14 W, 0.24, and 0.75, respectively.

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“…The ratio between the mechanical power of the rotor and the mechanical power of the wind passing through the rotor, described as follows (27,35):…”

Section: Equation Designmentioning

confidence: 99%

“…TSR is the ratio of rotor speed to wind speed. Wind speed will affect the rotational speed of the turbine rotor so that the power produced is highly dependent on the TSR, with the equation (27,35):…”

Section: Equation Designmentioning

confidence: 99%

Double-stage Savonius and Darrieus wind turbines for urban areas using fiberglass materials

et al. 2022

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“…Aboujaoude et al [14] proposed to include an axisymmetric deflector to the SWT to elevate its aerodynamic performance. Tjahjana et al [19] assessed the influence of the slotted blades in an SWT that resulted in a 34% increase in the power coefficient. Xu et al [20] recently introduced the use of plasma excitation flow control to the SWT that enabled a significant improvement in its output torque and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Savonius Wind Turbine Numerical Parametric Analysis Using Space-Filling Design and Gaussian Stochastic Process

Ubando

San

Cruz

2022

Wind

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Wind energy is an alternative source of clean energy to address the growing energy demand and provide pollution-free electricity. With the rapid development of urban areas, high wind energy resources such as high-rise building rooftops are excellent locations for urban wind turbine installation. One of the practical and simple urban wind turbines is the Savonius design. It has a simple design, easy to maintain, and is very affordable. This work focuses on the design evaluation of a Savonius wind turbine (SWT) by varying the rotor diameter, rotor height, and twist angle for urban applications. A transient computational fluid dynamics (CFD) approach is applied to assess the various design treatments using a space-filling design of experiments. To address the spaces in the hypercube statistical design, a sphere packing design method was adopted which suited the evaluation of computational simulations results such as that of the CFD. The Gaussian stochastic process model was applied to establish the trend of the parametric performance of the optimized SWT design through the model fitting. The results have shown that optimized SWT performs well with its self-starting capability compared to the traditional Savonius design. In addition, the optimized SWT has shown a better peak power coefficient compared with the results of previous works on the design of SWT.

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“…Energy has an essential role in solving problems to achieve sustainability and development of different countries [1]. Work to obtain the required energy enjoys a direct correlation with productivity and economic development.…”

Section: Introductionmentioning

confidence: 99%

“…Work to obtain the required energy enjoys a direct correlation with productivity and economic development. So far, remarkable progress in conjunction with renewable energy has been made [1,2]. Solar, wind, wave, and geothermal energies are among the most important renewable energies.…”

Section: Introductionmentioning

confidence: 99%

Performance assessment and optimization of a helical Savonius wind turbine by modifying the Bach’s section

et al. 2021

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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.

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Experimental study of the effect of slotted blades on the Savonius wind turbine performance

Cited by 37 publications

References 29 publications

Double-stage Savonius and Darrieus wind turbines for urban areas using fiberglass materials

Double-stage Savonius and Darrieus wind turbines for urban areas using fiberglass materials

Savonius Wind Turbine Numerical Parametric Analysis Using Space-Filling Design and Gaussian Stochastic Process

Performance assessment and optimization of a helical Savonius wind turbine by modifying the Bach’s section

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