Optimal shape of thick blades for a hydraulic Savonius turbine

Kerikous, Emeel; Thévenin, Dominique

doi:10.1016/j.renene.2018.11.037

Cited by 100 publications

(36 citation statements)

References 33 publications

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“…This reduced the negative torque on the returning blade. Average C m linearly increased with the increment of TSR [31]. For all cases, the maximum values of average C m were obtained at the lowest TSR = 0.6.…”

Section: Effect Of Deflector Anglementioning

confidence: 77%

“…The incoming flow was conducted to advancing the blade by the deflector. The high momentum flow reached to the concave side of the advancing blade caused to increase the pressure in this zone [31]. On the other hand, the redirected incoming flow did not hit the convex side of the returning blade, which significantly reduced the pressure in this zone.…”

Section: Flow Field Analysismentioning

confidence: 97%

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Improving efficiency of Savonius wind turbine by means of an airfoil-shaped deflector

Layeghmand

Tabari

Zarkesh

2020

J Braz. Soc. Mech. Sci. Eng.

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In the present study, a novel deflector system was proposed to improve the performance of a Savonius wind turbine through Computational Fluid Dynamics (CFD) simulation. For this purpose, an airfoil-shaped deflector was proposed and placed in front of the turbine to prevent the negative torque affecting the convex surface of the returning blade and also making it possible for deflecting the wind into the advancing blade. Different configurations of the proposed deflector system were considered numerically using the CFD solver. A three-dimensional incompressible unsteady Reynolds-averaged Navier-Stokes simulation in conjunction with the SST k − ω turbulence model was done and validated with the available experimental data. The predicted results indicated that the performance of the Savonius rotor is highly dependent on the position and angle of the deflector. Thus, there was an appropriate position and angle values to obtain the highest torque and power coefficients. It was concluded that using the favorable airfoil-shaped deflector significantly enhanced the static torque coefficient values in all angular ranges especially in the rotation angles between 0°-30° and 150°-180°. By properly covering the returning blade using the airfoil-shaped deflector, the static torque coefficient values increased up to two times higher than that generated by without deflector case.

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Section: Effect Of Deflector Anglementioning

confidence: 77%

Section: Flow Field Analysismentioning

confidence: 97%

Improving efficiency of Savonius wind turbine by means of an airfoil-shaped deflector

Layeghmand

Tabari

Zarkesh

2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…In another experimental study, Altan and Atilgan found optimum curtain angles (α and β) as α = 45° and β = 15° as shown in Figure . Kerikous and Thevenin attempted to enhance the performance of turbine by optimizing the shape of Savonius blade. The optimized shape was redesigned in such a way that the concave side of blade became more flatter, and the convex side of the blade is unchanged.…”

Section: Configurations Of Cross‐flow Hydrokinetic Turbinesmentioning

confidence: 99%

A review on technology, configurations, and performance of cross‐flow hydrokinetic turbines

Saini

2019

Int J Energy Res

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Summary Increased demand of energy leads to exploration of new sources of energy. In the last few years, hydrokinetic energy technology emerged as an important area in the field of renewable energy generation. Various hydrokinetic turbines have been studied and used to harness the hydrokinetic potential. Among all hydrokinetic turbine technology, cross‐flow hydrokinetic turbine is considered as the most suitable approach for the riverine system. There are various configurations of cross‐flow hydrokinetic turbine exist for hydrokinetic energy extraction. A number of numerical and experimental studies were carried out on the performance enhancement and design optimization of different configurations under variable operating conditions. Under the present paper, review of different rotor for the configurations of the cross‐flow hydrokinetic turbines are discussed. The paper will be useful to understand the cross‐flow hydrokinetic technology in order to explore the methods for selection, performance enhancement, and design optimization of cross‐flow hydrokinetic turbines.

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“…Tian Wenlong et al [14] proposed a modified Savonius wind turbine with novel blade shapes, which had a 10.98% performance improvement compared with a conventional Savonius turbine. Kerikous E. et al [15] introduced 12 geometrical parameters to describe the shape of the blade. The full property potential of the SHT was investigated by coupling computational fluid dynamics (CFD) with the in-house flow optimizer OPALL.…”

Section: Introductionmentioning

confidence: 99%

“…Investigations of the hydrodynamic characteristics of the SHT have been conducted by scholars [10][11][12][13][14][15][16][17][18]. However, research on the influence of a turbine on the wake velocity field has not been attempted.…”

Section: Introductionmentioning

confidence: 99%

Parameter Analysis of Savonius Hydraulic Turbine Considering the Effect of Reducing Flow Velocity

Yao

Chen

et al. 2019

Energies

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The Savonius-type hydraulic turbine, mainly known for its good self-starting properties and simple structure, not only has energy capturing characteristics but also has a certain effect on flow velocity reduction. Aside from ensuring energy capture efficiency, studying the effects of parameters on the flow velocity reduction capacity is of great significance for the protection of mariculture, as it can reduce the damage to cages and fishes. In this study, a computational fluid dynamics method was carried out to investigate the hydrodynamic characteristics and variations in the wake of a turbine. The accuracy of the simulation results was verified by experimental comparison. Firstly, the velocity contours and vectors were studied in detail to reveal the mechanism of the flow velocity reduction effect. Secondly, the velocity attenuation coefficient and relative attenuation length were formulated by the variation rule of the velocity field to evaluate the turbine reduction strength and range. Finally, the power coefficient was considered to predict the performance of a turbine under different tip speed ratios, overlap ratios, blade curvatures, and blade numbers. The results showed that the turbine had an obvious flow velocity reduction effect in the rear “sword”-shaped area, where the velocity field distribution had a certain regularity. In addition, by comprehensively comparing the simulation data, it was found that the respective effect trend of tip speed ratio, blade number, overlap ratio, and curvature on the turbine’s energy capture and flow velocity reduction characteristics was basically the same. Considering the effect of reducing flow velocity, a two-bladed turbine with a blade curvature of 0.8 and an overlap ratio of 0.15 is the optimal configuration.

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Optimal shape of thick blades for a hydraulic Savonius turbine

Cited by 100 publications

References 33 publications

Improving efficiency of Savonius wind turbine by means of an airfoil-shaped deflector

Improving efficiency of Savonius wind turbine by means of an airfoil-shaped deflector

A review on technology, configurations, and performance of cross‐flow hydrokinetic turbines

Parameter Analysis of Savonius Hydraulic Turbine Considering the Effect of Reducing Flow Velocity

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