A comparative study review: The performance of Savonius-type rotors

Al-Gburi, Kumail Abdulkareem Hadi; Alnaimi, Firas Basim Ismail; Al-quraishi, Balasem A.; Tan, Ee Sann; Maseer, Muayad M.

doi:10.1016/j.matpr.2021.09.226

Cited by 12 publications

(10 citation statements)

References 62 publications

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“…Prinsip dasar pengoperasian turbin savonius terletak pada selisih gaya drag yang diberikan oleh angin pada kedua bucket (blade) yang menyebabkan turbin berputar. Konstruksi sederhana turbin savonius klasik terlihat pada Gambar 1 Gambar 1 Konsep awal savonius [6] Keunggulan dari turbin savonious memiliki stuktur sederhana, mudah di produksi, memiliki frekuensi rendah, dapat menerima angin dari segala arah, torsi awal tinggi, rentang kecepatan kerja angin yang lebar, sesuai untuk aplikasi pada daerah perkotaan akan tetapi savonious memiliki efisiensi yang rendah [6][7][8][9][10][11] jika dibandingkan dengan turbin lainnya. Kinerja turbin Savonious ditinjau dari dua parameter utama yaitu koefisien torsi C T dan Koefisien daya Cp Salah satu parameter yang mempengaruhi nilai koefisien tersebut adalah parameter Overlap Ratio (OR).…”

Section: Pendahuluanunclassified

Pengaruh Overlap Ratio pada Model Turbin Savonius terhadap Karakteristik Koefisien Daya Berdasarkan Eksperimen Pada Wind Tunnel

Sumiati

Artia²,

Dinata³

et al. 2022

jtm

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Wind energy is a resource that is abundant, environmentally friendly, and renewable, therefore it has the potential to be developed. Savonius vertical axis type is suitable for application in low wind speed conditions. The Savonius wind turbine has good self-starting so that it is able to rotate the rotor even though the wind speed is low, besides that the torque it produces is relatively high. This study aims to determine how differences in OR affect the performance of Savonius turbines with an aspect ratio (AR) of 2. The experimental method was applied in this research to investigate the characteristic Cp of the model using the wind tunnel with different overlap ratios of 0.1, 0.15, 0.2, 0.25, and 0.3. The wind turbine model that has been made using a 3D printing process made of PLA + material. The results obtained in each OR test are the maximum Cp value for the variation OR 0.1, which is 0.121, OR 0.15, the maximum Cp value obtained is 0.213, OR 0.2, the maximum Cp value is 0.245, OR 0.25, the maximum Cp value is 0.224 and OR 0.3, the maximum Cp value is 0.210. Based on the five overlap variations, the maximum Cp ratio is obtained at OR = 0.2, namely Cp = 0.245 and TSR = 0.7. The OR value of 0.2 is able to maximize turbine power and minimize negative torque because the flow through the overlap area can maximally direct wind power to the maximum backward blade.

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Section: Pendahuluanunclassified

Pengaruh Overlap Ratio pada Model Turbin Savonius terhadap Karakteristik Koefisien Daya Berdasarkan Eksperimen Pada Wind Tunnel

Sumiati

Artia²,

Dinata³

et al. 2022

jtm

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“…However, Savonius turbines have a huge deficiency in the rate of energy conversion compared to other turbine rotors [22]. In addition, Al-Gburi et al, [23] also stated that the returning blade of the Savonius rotor produces lots of negative torque.…”

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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“…In recent works, Crooks et al [17] conducted a computational design analysis study of a counter-rotating Darrieus turbine system, Karimian and Abdolahifar [18] proposed a new Darrieus design to benefit from straight-blade and helical-blade VAWTs, and Dadamoussa et al [19] added Vortex Generators on the blades of a Darrieus VAWT, improving its performance. Al-Gburi et al [20] compared the influence of several parameters on the performance of a Savonius rotor, and Altan and Gultekin [21] proposed additional design processes for Savonius rotor performance enhancement.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Performance of Vertical-Axis Wind Turbines

Redchyts

Portal-Porras

Tarasov

et al. 2023

JMSE

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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.

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A comparative study review: The performance of Savonius-type rotors

Cited by 12 publications

References 62 publications

Pengaruh Overlap Ratio pada Model Turbin Savonius terhadap Karakteristik Koefisien Daya Berdasarkan Eksperimen Pada Wind Tunnel

Pengaruh Overlap Ratio pada Model Turbin Savonius terhadap Karakteristik Koefisien Daya Berdasarkan Eksperimen Pada Wind Tunnel

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

Aerodynamic Performance of Vertical-Axis Wind Turbines

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