Experimental Investigation on the Influence of Overlap Ratio on Savonius Turbines Performance

Rus, Tania; Rus, Lucian Florin; Ilutiu-Varvara, Dana Adriana; Mare, R.F. de la; Abrudan, Ancuţa C.; Domniţa, Florin

doi:10.20508/ijrer.v8i3.7764.g7480

Cited by 3 publications

(3 citation statements)

References 13 publications

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“…So, effects of the overlap blade perform the best and have the highest average Torque Coefficient when compared with a non-overlap. However, based on the research [19], a better moment and power coefficient can be gained if the overlap is increased until 0.3. Focusing around the Savonius blade for the models, Figure 7 shows the turbulent kinetic energy distribution around the computational domain.…”

Section: Pressure Contourmentioning

confidence: 99%

Comparison of Non-Overlap and Overlap Savonius Wind Turbines in the Physics Aspect Using Computational Fluid Dynamics Method

Nensy Irawan,

Yamashita,

Fujita

2024

J. Phys.: Conf. Ser.

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Wind energy has good potential as a renewable energy source. Savonius-type wind turbines can provide power generation at a low cost with minimal environmental impact. Due to its low efficiency, researchers were focused on increasing it through many methods, such as applying twisted-bladed, optimizing the blade shape, and applying overlap. Most researchers have studied the effects of overlap on Savonius blades only in terms of performance improvements. This study evaluates the effect of overlap on the Savonius blade from a physics perspective using the Computational Fluid Dynamics method to get a new approach based on the improvement. The models are 2-bladed Savonius with non-overlap and 0.2 overlap. The main software used is Ansys Student 2023 R2. The turbulent model chosen is a realizable k- enhanced wall treatment. Then, pressure and velocity coupling were done using SIMPLE: 2nd order upwind, 1st order implicit. As a result, the overlap model has a higher reverse flow but lower pressure for all Tip Speed Ratio. Another finding shows that turbulent kinetic energy decreases with overlap. For the non-overlap model, the amount of turbulence is greater downstream, which causes vortices to form and lowers turbine performance. So, the effects of the overlap blade result in higher average Torque Coefficient than non-overlap.

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Section: Pressure Contourmentioning

confidence: 99%

Comparison of Non-Overlap and Overlap Savonius Wind Turbines in the Physics Aspect Using Computational Fluid Dynamics Method

Nensy Irawan,

Yamashita,

Fujita

2024

J. Phys.: Conf. Ser.

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“…The primary focus of these studies revolves around the examination of the impact of various parameters on its performance. According to a study conducted by Tania et al [13], the Savonius rotor is most efficient while operating at wind speeds below four meters per second, provided that the overlap ratio (OR) is set at 0.15. However, wind speeds over 4 m/s or turbulent wind conditions need an overlap ratio of 0.3.…”

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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“…The classification of wind turbines based on their axes is classified into 2 types, namely horizontal and vertical axes [2]. Wind turbine performance can be improved by varying the shape of turbine blades such as overlap [3], myring, and fin [4]- [7] or variations on the addition of a disruptive cylinder [8], [9]. Variations in the addition of cylinders can also be done in terms of stagger angle, cylinder distance, and Projek Priyonggo Sumangun Lukitadi, Departement of Marine Engineering, Shipbuilding Institute of Polytechnic Surabaya, Indonesia.…”

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confidence: 99%

Simulation of Overlap Effect on Savonius Wind Turbine Performance by Varying Cylinder Distance in Front of Returning Blade

Lukitadi,

Setiawan,

Firmansyah

2023

IJMEIR

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⎯ The performance of Savonius wind turbine was improved in the previous experimental studies that added overlap and variation of disruptive cylinder distances in front of returning blade. However, the study could not display flow visualization such as velocity contours, streamlined velocity, and pressure contours on turbines so further research is needed. This research is in the form of numerical study using 3-dimensional Computational Fluid Dynamics (CFD) method. The simulation is, determine visualize the turbine's flow like a velocity contours, streamlined velocity, and pressure contours. The turbine has the same diameter and height of 0.4 meters with overlap addition. The various distances of the disruptive cylinder used is S/d = 1.4; S/d = 1.7 ; S/d = 2 and S/d = 2.3. The final result shows that the visualization at a distance of S/d = 1.7 is the most optimal wake distance to cover the overall returning blade side so that the performance of the Savonius wind turbine at that distance is highest compared to other variations.

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Experimental Investigation on the Influence of Overlap Ratio on Savonius Turbines Performance

Cited by 3 publications

References 13 publications

Comparison of Non-Overlap and Overlap Savonius Wind Turbines in the Physics Aspect Using Computational Fluid Dynamics Method

Comparison of Non-Overlap and Overlap Savonius Wind Turbines in the Physics Aspect Using Computational Fluid Dynamics Method

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

Simulation of Overlap Effect on Savonius Wind Turbine Performance by Varying Cylinder Distance in Front of Returning Blade

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