Influence of blade profiles on Savonius rotor performance: Numerical simulation and experimental validation

Alom, Nur; Saha, Ujjwal K.

doi:10.1016/j.enconman.2019.02.058

Cited by 119 publications

(38 citation statements)

References 41 publications

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“…All geometries are analyzed in transient regime, under the same algorithms, parameters, and models of computational fluid dynamics (CFD) through the ANSYS Fluent software. The turbulence model k − ω SST is proposed for its good performance in predicting free flows and adverse pressure gradients [32][33][34]. A coupled scheme was selected for the pressure-velocity coupling algorithm and an implicit transient first-order formulation was used.…”

Section: Specification Of the Numerical Analysismentioning

confidence: 99%

Numerical and Experimental Study of the Blade Profile of a Savonius Type Rotor Implementing a Multi-Blade Geometry

et al. 2021

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In the present study, the implementation of multi-blade profiles in a Savonius rotor was evaluated in order to increase the pressure in the blade’s intrados and, thus, decrease motion resistance. The geometric proportions of the secondary element were determined, which maximized the rotor’s performance. For this, the response surface methodology was used through a full factorial experimental design and a face-centered central composite design, consisting of three factors, each with three levels. The response variable that was sought to be maximized was the power coefficient (CP), which was obtained through the numerical simulation of the geometric configurations resulting from the different treatments. All geometries were studied under the same parameters and computational fluid dynamics models through the ANSYS Fluent software. The results obtained through both experimental designs showed a difference of only 1.06% in the performance estimates using the regression model and 3.41% when simulating the optimal proportions geometries. The optimized geometry was characterized by a CP of 0.2948, which constitutes an increase of 10.8% in its performance compared to the profile without secondary elements and of 51.2% compared to the conventional semicircular profile. The numerical results were contrasted with experimental data obtained using a wind tunnel, revealing a good degree of fit.

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Section: Specification Of the Numerical Analysismentioning

confidence: 99%

Numerical and Experimental Study of the Blade Profile of a Savonius Type Rotor Implementing a Multi-Blade Geometry

et al. 2021

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“…The incompressible Unsteady Reynolds-averaged Navier Stokes (URANS) equations with the SST k − ω turbulence model were adopted in order to simulate the boundary layer turbulence for solving the airflow field around the turbine blades. Researchers reported that the SST k − ω model is the most appropriate model to simulate the wind turbine performance because of its reasonable requirement of computational resources [24][25][26][27]. The governing equations are as follows:…”

Section: Numerical Procedures and Mathematical Equationsmentioning

confidence: 99%

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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“…Hook shaped blade was reported as optimal shape to divert flow on the advancing blade with 15% increase in Cp at TSR=1.2. Alom and Saha (2019) reported improvement in Cp for rotor blades with elliptical shape by 20.25% over semicircular rotor blades. Recently, pivoted blades are analysed experimentally and numerically by Amiri et al (2019) by varying the aspect ratio and by including end plates.…”

Section: Introductionmentioning

confidence: 97%

Performance Improvement in Savonius Wind Turbine by Modification of Blade Shape

Ramarajan

Jayavel

2022

JAFM

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Wind energy is one of the abundantly available renewable energy resources. Savonius vertical axis wind turbine is better suited for small scale power generation applications with many advantages. The turbine operates independent of wind direction with good starting torque and less noise. But, the power coefficient of the Savonius turbine is less than all other wind turbines. The shape of the turbine blades plays an important role in the performance of the turbine. In this present two-dimensional numerical study, an attempt has been made to improve the turbine performance by considering three types of blade shapes. The complete design details of the proposed new blade shapes are presented. The simulations are carried out using ANSYS Fluent 15.0 with SST K-ω turbulence model. The power coefficient of the modified blade is found to have increased by 20% compared to conventional blade shape. The effect of tip-speed-ratio on power coefficient has also been studied and reported.

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Influence of blade profiles on Savonius rotor performance: Numerical simulation and experimental validation

Cited by 119 publications

References 41 publications

Numerical and Experimental Study of the Blade Profile of a Savonius Type Rotor Implementing a Multi-Blade Geometry

Numerical and Experimental Study of the Blade Profile of a Savonius Type Rotor Implementing a Multi-Blade Geometry

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

Performance Improvement in Savonius Wind Turbine by Modification of Blade Shape

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