Computational fluid dynamics study of Savonius rotors using OpenFOAM

Madina, Federico González; Gutierrez, Alejandro; Galione, Pedro

doi:10.1177/0309524x20924958

Cited by 5 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the last few decades, CFD has been widely employed in wind turbine design and performance assessments, lowering the number of experiments needed for performance testing of various configurations. 44,45 k- ω SST turbulence model, a two-equation turbulence model from the family of Reynolds Averaged Navier-Stokes (RANS) models, gives a trade-off between computational accuracy and computation time. When compared to experimental data, k- ω SST model proved its success in predicting the boundary layer velocity profile for adverse pressure gradient separated flows.…”

Section: Methodsmentioning

confidence: 99%

Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Yilmaz

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

This paper proposes a design strategy based on an understanding of basic rotor aerodynamics principles to achieve aerodynamically efficient small wind turbine rotor by determining proper design tip speed ratio (TSR) and number of blades. In the design and performance analyses of rotors, the blade element momentum (BEM) method was employed in conjunction with the Viterna-Corrigan post-stall model and Buhl’s wake state model. BEM simulations use the Re number dependent airfoil aerodynamic coefficients derived through Xfoil panel code. Reduced design tip speed ratio increased rotor solidity and hence blade Reynolds number. The width of the optimum TSR range, on the other hand, was found to decrease when the design TSR was less than a certain threshold. At high tip speeds, rotors with optimum design TSR were able to maintain an almost constant and near-ideal axial induction factor, resulting widest optimum TSR range for high aerodynamic efficiency. Increasing number of blades ( B) increased CP,max, but further increase in B lowered rotor efficiency due to reduced blade Re number. Based on CFD results, 5-blade SD7032 rotor with a design TSR of 4 achieved 12.3% higher CP,max compared to 0.9 m diameter 3-blade experimental reference rotor. Maximum achievable power coefficient of infinitely many-bladed ideal rotor with design TSR of 4 is 0.559, while CP,max of 5-blade SD7032 rotor is 0.492.

show abstract

Section: Methodsmentioning

confidence: 99%

Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Yilmaz

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Passing to the third level of simulation of aerodynamic flows, it is possible to state that calculations on the basis of RANS equations are becoming widely used in industrial practice. Sun et al [11] studied operating variations of a Darrieus VAWT by means of RANS equations, and Gonzalez Madina et al [12] studied that of a Savonius [13] VAWT.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Performance of Vertical-Axis Wind Turbines

Redchyts

Portal-Porras

Tarasov

et al. 2023

JMSE

View full text Add to dashboard Cite

The nonstationary separated incompressible flows around Darrieus and Savonius rotors of vertical-axis wind turbines were investigated through computational simulation using the Reynolds averaged Navier–Stokes equations and Spalart–Allmaras turbulence model. The implicit finite-volume algorithm, the basis of which was artificial compressibility method, was chosen to obtain the numerical solution. The series of computational and physical experiments for Darrieus rotors with varied numbers and shapes of blades were performed. The detailed visualization of the flow was presented. The turbulent flows surrounding the Darrieus and Savonius rotors were studied, and as a part of these investigations, the major phases of vortex progress were identified. For this purpose, three series of computer tests on the aerodynamic and power properties of Savonius rotors with two and three buckets were performed, and their results are also presented. The influence of tip-speed ratio, solidity, and Reynolds numbers on the power coefficients of the Darrieus and Savonius rotors was investigated. It has been demonstrated that increasing Reynolds number from 104 to 106 causes a rise in Darrieus rotors power coefficient from 0.15 up to 0.5. The maximum values of power coefficient are moved away from higher values of tip-speed ratio from 2 to 5 as a result of a decrease in Darrieus rotor solidity from 1.0 to 0.33. The greatest power coefficient for a Savonius rotor with two blades is 0.23 and for a Savonius rotor with three blades is 0.19.

show abstract

“…Mereu et al [19] investigated Savonius turbines as an alternative for power generation in urban areas. Madina et al [20] investigated the performance of vertical-axis wind turbines. Mauro et al [21] conducted a numerical study to examine the effect of the duct blockage on the performance of the Savonius wind turbine's rotor.…”

Section: Introductionmentioning

confidence: 99%

Examination of the Effect of Triangular Plate on the Performances of Reverse Rotating Dual Savonius Wind Turbines

Altan

Güngör

2022

Processes

View full text Add to dashboard Cite

In the present study, the performance of the Savonius wind turbine in designs with dual turbines rotating opposite to each other was examined. To improve the performance of the Savonius wind turbine in the dual turbine design, a triangular plate was placed in front of the turbines. The effects of the geometric parameters of this triangular plate which was placed on the turbine performance were studied. The numerical analyses performed were confirmed by the experimental data of a previous study in the literature. The performance values of Savonius wind turbines were analyzed by numerical analysis, the accuracy of which was proven by experimental data. ANSYS Fluent, a computational fluid dynamics (CFD) program, was used for the performance analysis. In the first stage, the maximum power coefficient (Cp) of the conventional Savonius wind turbine was obtained around 0.17. With the optimum geometric parameter studies, the maximum power coefficient of the Savonius wind turbine in the triangular plate dual turbine design was determined to be around 0.22. Thus, it was found that the power coefficient obtained by a single Savonius wind turbine in a triangular plate dual turbine design was around 30% higher compared to the power coefficient of the conventional Savonius wind turbine.

show abstract

Computational fluid dynamics study of Savonius rotors using OpenFOAM

Cited by 5 publications

References 25 publications

Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Increasing power coefficient of small wind turbine over a wide tip speed range by determining proper design tip speed ratio and number of blades

Aerodynamic Performance of Vertical-Axis Wind Turbines

Examination of the Effect of Triangular Plate on the Performances of Reverse Rotating Dual Savonius Wind Turbines

Contact Info

Product

Resources

About