Elliptical Bladed Savonius Rotor for Wind Energy: Efficacy of RANS Modeling for Flow Characteristics

Dewan, Anupam; Bishnoi, Ashok Kumar; Singh, Tej; Tomar, Shivam Singh

doi:10.1115/1.4056275

Cited by 10 publications

(2 citation statements)

References 45 publications

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“…The quest to improve the performance of the rotor is still underway as the conversion rate of this turbine is still considered unsatisfactory [24,25]. Tian et al, [26] performed an extensive study on the performance of the Savonius rotor and proposed four methods that can be used to improve the performance of the said turbine which are optimization of the basic parameters of the rotor, enhancing the wind blades in the aspect of geometric characteristics, adding support to the blades and Improving the flow field around the blade.…”

Section: Introductionmentioning

confidence: 99%

Comparison of 2D and 3D Simulations on Predicting the Performance of a Savonius Wind Turbine

Ahmad Adib Najib,

Djamal Hissein Didane,

Mostafa Radwan Behery

et al. 2024

CFDL

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The performance of Savonius rotors plays a vital role in harnessing wind energy for various applications. This study aims to investigate and compare the performance characteristics of Savonius rotors using two-dimensional (2D) and three-dimensional (3D) analysis approaches. The primary objective is to determine the optimal analysis method for evaluating the rotor's performance. The simulations were conducted using ANSYS software, considering six different tip-speed ratios (TSRs) ranging from 0.2 to 1.2, and three wind speed categories (7 m/s, 5 m/s, and 3 m/s). The hybrid shear-stress transport (SST) k-omega was used as the turbulence model. The results indicate that the 2D analysis approach, which simplifies the rotor's geometry by assuming rotational symmetry, provides reasonable estimations of the rotor's performance. However, the 3D analysis captures the intricacies of the rotor's actual geometry, accounting for the effects of non-uniform flow and vortex shedding, which can significantly influence the rotor's performance. The comparative analysis reveals that the 3D analysis predicts higher torque and power coefficients than the 2D approach, especially at higher wind speeds. At TSR 1.0, the torque and power coefficient obtained from the 3D approach are 6.56 Nm and 0.102, respectively meanwhile 2D approach gains 6.28 Nm torque and 0.098 for power coefficient. This research contributes to a better understanding of the performance characteristics of Savonius rotors and highlights the importance of considering three-dimensional effects in their analysis. The findings can guide the design and optimization of Savonius rotor systems, leading to improved wind energy conversion efficiency and enhanced utilization of renewable energy resources.

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Section: Introductionmentioning

confidence: 99%

Comparison of 2D and 3D Simulations on Predicting the Performance of a Savonius Wind Turbine

Ahmad Adib Najib,

Djamal Hissein Didane,

Mostafa Radwan Behery

et al. 2024

CFDL

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“…In order to maximize the Savonius rotor's efficiency experts have suggested numerous modifications and refinements to the design. They had examined the effects of diverse design characteristics, such as modification of blade shape [3], [4], [5], [6], variation of overlap ratio [7], [8], [9], endplates [10], [11], aspect ratio [12], number of stage rotors [12], and number of blades [9]. The primary focus of these studies revolves around the examination of the impact of various parameters on its performance.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Savonius Rotor Performance With Zigzag Surface Investigated at Drag Force, Pressure, and Flow Visualization Analysis

Sumiati,

Dinata,

Saputra

2024

TEM Journal

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Savonius, a type of vertical-axis wind turbine, is a small-scale energy conversion device suitable for low wind speeds, such as those characteristic of Indonesian wind speeds, yet has low efficiency. Savonius is a drag-type turbine. Drag force on the surface is affected by roughness or wavyness. The purpose of this study is to analyze the impact of applying wavy (zigzag) variations to the concave surface of Savonius blades on their performance. This was achieved by the use of 3D computational fluid dynamics simulation at TSR 0.6 with a velocity inlet of 5 m/s. The model was semicircular, zigzag on the concave surface on semicircular with t = 0.75, t = 0.25, and t = 1 mm. The result of this study's CD maximum is 1,817 at the zigzag model with t = 1 and CD avrg =1.24. The average drag coefficient increased by 14 percent compared to the conventional semicircular rotor. The maximum Cp value is also found at t = 1 mm, which is 0.315. The power coefficient increased by 29 percent compared to the conventional semicircular rotor. The total pressure on the blade shows the highest model with t = 1 mm at the same angle of attack (α = 30). Zigzag on the concave surface affects blade pressure, which improves the performance of the Savonius rotor.

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Effects of axisymmetric-omnidirectional deflector on aerodynamics of modified Bach Savonius rotor for power enhancement

Tomar,

Dewan,

Singh

2023

Energy Conversion and Management

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Elliptical Bladed Savonius Rotor for Wind Energy: Efficacy of RANS Modeling for Flow Characteristics

Cited by 10 publications

References 45 publications

Comparison of 2D and 3D Simulations on Predicting the Performance of a Savonius Wind Turbine

Comparison of 2D and 3D Simulations on Predicting the Performance of a Savonius Wind Turbine

Enhancing Savonius Rotor Performance With Zigzag Surface Investigated at Drag Force, Pressure, and Flow Visualization Analysis

Effects of axisymmetric-omnidirectional deflector on aerodynamics of modified Bach Savonius rotor for power enhancement

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