Evolution and Progress in the Development of Savonius Wind Turbine Rotor Blade Profiles and Shapes

Alom, Nur; Saha, Ujjwal K.

doi:10.1115/1.4041848

Cited by 64 publications

(25 citation statements)

References 100 publications

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“…Wind Turbines (SSWT) so far; it aimed to increase the performance of Savonius wind turbines [24]. One of them by inserting an extra multiple quarter blade [25].…”

Section: It Had Been Developed Various Profiles Of New Types Of Bladementioning

confidence: 99%

Experimental Study of Savonius Wind Turbine Performance with Blade Layer Addition

Kurniawan¹,

Tjahjana²,

Santoso³

2020

ARFMTS

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Savonius, a type of vertical axis wind turbine (VAWT), is applicable for harvesting wind energy in Indonesia, having an average wind speed of 4-5 m/s. Owning the advantages as suitable for placing in the urban areas as well as reducing the huge electricity load, the Savonius received considerable attention from researchers in making the performance improvement. Therefore, the current research provides an investigation on the effect of adding extra layers on concave blades on the performance of the Savonius wind turbine model. As the novelty, the modification of conventional Savonius turbine has been developed by adding single and multiple layer blades on the tip blade with an overlap ratio (OR) of 10 and 15%. It was tested under wind speeds of 6.46, 6.99, and 7.27 m/s, which generated by the fans blower with a 2x2 configuration. The results show that the addition of multiple layers increased the Savonius power coefficient by 22.4% and 11.2% at OR of 10 and 15%, respectively. The highest power coefficient (Cp) is found at 0.12, which obtained by the Savonius turbine with multiple layers of 90⁰ and OR of 10% configuration. It is concluded that adding the multiple layer blades enhanced the performance of Savonius wind turbines.

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“…Wind Turbines (SSWT) so far; it aimed to increase the performance of Savonius wind turbines [24]. One of them by inserting an extra multiple quarter blade [25].…”

Section: It Had Been Developed Various Profiles Of New Types Of Bladementioning

confidence: 99%

Experimental Study of Savonius Wind Turbine Performance with Blade Layer Addition

Kurniawan¹,

Tjahjana²,

Santoso³

2020

ARFMTS

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“…When the number of the blades was three and the aspect ratio of the blades was 1:1, the maximum power coefficient was 0.25 and the optimal tip-speed ratio was 0.4 [22]. Here, the optimal tip-speed ratios of Savonius-type VAWTs are in the range of 0.45 to 1.0 [21]. Except for several studies that were conducted using a wind tunnel with a very high blocking ratio of the closed test section, the maximum power coefficient of the Savonius-type VAWT was, at most, 0.25 [21].…”

Section: Introductionmentioning

confidence: 87%

“…With regard to lift-type VAWTs, a lot of research on Darrieus-type VAWTs, including straight-bladed and helical-bladed ones, has been conducted [13][14][15][16]. With regard to drag-type VAWTs, a lot of research on Savonius-type VAWTs has been conducted [17][18][19][20][21]. In general, the optimal tip-speed ratio of a drag-type VAWT is less than 1.0 [11], which is much smaller than that of a lift-type VAWT.…”

Section: Introductionmentioning

confidence: 99%

“…Here, the optimal tip-speed ratios of Savonius-type VAWTs are in the range of 0.45 to 1.0 [21]. Except for several studies that were conducted using a wind tunnel with a very high blocking ratio of the closed test section, the maximum power coefficient of the Savonius-type VAWT was, at most, 0.25 [21]. That is, the O-VAWT has a lower optimal tip-speed ratio than Savonius-type VAWTs, although the maximum power coefficient is relatively high.…”

Section: Introductionmentioning

confidence: 99%

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Performance Characteristics of an Orthopter-Type Vertical Axis Wind Turbine in Shear Flows

2020

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To properly conduct a micro-siting of an orthopter-type vertical axis wind turbine (O-VAWT) in the built environment, this study investigated the effects of horizontal shear flow on the power performance characteristics of an O-VAWT by performing wind tunnel experiments and computational fluid dynamics (CFD) simulations. A uniform flow and two types of shear flow (advancing side faster shear flow (ASF-SF) and retreating side faster shear flow (RSF-SF)) were employed as the approaching flow to the O-VAWT. The ASF-SF had a higher velocity on the advancing side of the rotor. The RSF-SF had a higher velocity on the retreating side of the rotor. For each type of shear flow, three shear strengths (Γ = 0.28, 0.40 and 0.51) were set. In the ASF-SF cases, the power coefficients (Cp) were significantly higher than the uniform flow case at all tip speed ratios (λ) and increased with Γ. In the RSF-SF cases, CP increased with Γ. However, when Γ = 0.28, the CP was lower than the uniform flow case at all λ. When Γ = 0.51, the CP was higher than the uniform flow case except at low λ; however, it was lower than the ASF-SF case with Γ = 0.28. The causes of the features of CP were discussed through the analysis of the variation of blade torque coefficient, its rotor-revolution component and its blade-rotation component with azimuthal angle by using the CFD results for flow fields (i.e., horizontal velocity vectors, pressure and vorticity). These results indicate that a location where ASF-SFs with high Γ values dominantly occur is ideal for installing the O-VAWT.

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“…Reynolds number is that, NACA profiles are usually developed for high Reynolds number and thus suffer from significant laminar separation bubbles when it operate at low Reynolds number. Due to this laminar separation the coefficient of lift decreases, while coefficient of drag increases gradually (Alom and Saha, 2019).…”

Section: The Reason Of Low Coefficient Of Lift-to-drag Ratio At Lowmentioning

confidence: 98%

Design Optimization and Analysis of Rotor Blade for Horizontal-Axis Wind Turbine Using Q-Blade Software

Mujahid¹,

Rafai²,

Imran³

et al. 2021

Pak. j. sci. ind. res. Ser. A: phys. sci.

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Wind energy plays a tremendous role in energy power sector in terms of wind turbine. Engineers and scientists are trying to improve the wind turbine design in order to get the maximum power efficiency from the wind, which is one of the most cheap and common renewable resource in nature. The objective of this study was to design a horizontal wind turbine rotor blade for a site of known wind data in order to extract the maximum power efficiency from the wind by using blade element theory analysis and Q-Blade simulation. Eight different aerofoils of different thicknesses from two NACA family 55xx and 00xx were considered for this study. The four different rotor blades were designed having length of 25 meter. Each blade consists of the combination of these NACA aerofoils which are oriented at different angles of attack and to simulate it at different Reynolds numbers. Comparative study was done to find the optimum blade design by considering the power output at two different rotational speeds and observe the effects of changing chord length and twist angle of final selected blade on these power output.

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Evolution and Progress in the Development of Savonius Wind Turbine Rotor Blade Profiles and Shapes

Cited by 64 publications

References 100 publications

Experimental Study of Savonius Wind Turbine Performance with Blade Layer Addition

Experimental Study of Savonius Wind Turbine Performance with Blade Layer Addition

Performance Characteristics of an Orthopter-Type Vertical Axis Wind Turbine in Shear Flows

Design Optimization and Analysis of Rotor Blade for Horizontal-Axis Wind Turbine Using Q-Blade Software

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