Artículos de revistas: "Savonius rotor"

1

Sahim, Kaprawi, Kadafi Ihtisan, Dyos Santoso y Riman Sipahutar. "Experimental Study of Darrieus-Savonius Water Turbine with Deflector: Effect of Deflector on the Performance". International Journal of Rotating Machinery 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/203108.

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The reverse force on the returning blade of a water turbine can be reduced by setting a deflector on the returning blade side of a rotor. The deflector configuration can also concentrate the flow which passes through the rotor so that the torque and the power of turbine can be considerably increased. The placing of Savonius in Darrieus rotor is carried out by setting the Savonius bucket in Darrieus rotor at the same axis. The combination of these rotors is also called a Darrieus-Savonius turbine. This rotor can improve torque of turbine. Experiments are conducted in an irrigation canal to find the performance characteristics of presence of deflector and Savonius rotor in Darrieus-Savonius turbine. Results conclude that the single deflector plate placed on returning blade side increases the torque and power coefficient. The presence of Savonius rotor increases the torque at a lower speed, but the power coefficient decreases. The torque and power coefficient characteristics depend on the aspect ratio of Savonius rotor.

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2

Cheng, Chao Yuan y Xiao Qing Wei. "The Innovative Design and Simulation Analysis of Small Savonius Wind Turbine". Advanced Materials Research 591-593 (noviembre de 2012): 832–36. http://dx.doi.org/10.4028/www.scientific.net/amr.591-593.832.

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Savonius rotor is a typical style of vertical-axis wind turbine (VAWT). A new innovative design of two Savonius rotors coaxially in the opposite direction is presented in the paper which is different from the traditional design. The traditional generator has only a pair of stator and rotor and matched with trational Savonius rotor. Enlarging the relative speed between the magnetic pole and the coil pole by making the two pole rotate in the opposite direction in the innovative Savonius wind turbine. In this way, it can enhance the power generation efficiency of the Savonius wind turbine. The fluid-solid coupling analysis for the Savonius wind turbine is used to calculate the power characteristics and efficiency of the wind turbine.

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3

Freitas, Felipe Augusto Lustosa Meireles, Ronaldo Barcelos e. Silva, Leonardo Da Rosa Schmidt, Silvana Maldaner y Lucinéia Fabris. "Análise da potência mecânica de rotores de Savonius de mesma razão de aspecto". Ciência e Natura 42 (7 de febrero de 2020): 33. http://dx.doi.org/10.5902/2179460x40635.

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An experimental performance study of Savonius small rotors is performed in this work. Two Savonius prototypes, two blades and the same aspect ratio, were constructed from vinyl polychloride and use different air flow. Experimental tests allowed the rotation speed of each rotor to be determined for different air flows. It is important to note that the average angular velocity of the smaller rotor is approximately fifty percent higher than the larger rotor. At the same time, the absorption torque on the rotor shaft was measured and the mechanical power of each Savonius wind turbine prototype was estimated. The main result was that wind turbines of the same aspect ratio have different performances.

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4

Doerffer, Krzysztof, Janusz Telega, Piotr Doerffer, Paulina Hercel y Andrzej Tomporowski. "Dependence of Power Characteristics on Savonius Rotor Segmentation". Energies 14, n.º 10 (18 de mayo de 2021): 2912. http://dx.doi.org/10.3390/en14102912.

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Savonius rotors are large and heavy because they use drag force for propulsion. This leads to a larger investment in comparison to horizontal axis wind turbine (HAWT) rotors using lift forces. A simple construction of the Savonius rotor is preferred to reduce the production effort. Therefore, it is proposed here to use single-segment rotors of high elongation. Nevertheless, this rotor type must be compared with a multi-segment rotor to prove that the simplification does not deteriorate the effectiveness. The number of segments affects the aerodynamic performance of the rotor, however, the results shown in the literature are inconsistent. The paper presents a new observation that the relation between the effectiveness of single- and multi-segment rotors depends on the wind velocity. A single-segment rotor becomes significantly more effective than a four-segment rotor at low wind speeds. At high wind speeds, the effectiveness of both rotors becomes similar.

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5

Song, Xiao Wen, Kai Yuan Cao, Zhong Rui Chen y Ke Shen. "Design Optimization of Savonius Rotors: An Overview". Applied Mechanics and Materials 58-60 (junio de 2011): 827–33. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.827.

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Since the Savonius rotor has a low starting torque and is adaptable for wind in various directions, it has received great attention in the past decades. In this paper, we present an overview of the state of the art in Savonius rotor design, according to three general strategies of design optimization: 1) Optimizing Savonius rotor structural parameters including overlap ratio, aspect ratio of the rotor, twist angle, Reynolds number, and the shaft of the rotor; 2)Adopting multi-level Savonius rotor or combining Savonius rotor with other type rotor to avoid negative torque of the rotor and improve both efficiency and starting torque; 3)Adding auxiliary devices such as curtain or guide-box to decrease the negative torque. We conclude with a discussion of the advantages and challenges associated with development of this promising technology.

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6

Etemadeasl, Vahid, Rasool Esmaelnajad, Farzad F. Dizaji y Babak Farzaneh. "A novel configuration for improving the aerodynamic performance of Savonius rotors". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, n.º 6 (17 de diciembre de 2018): 751–61. http://dx.doi.org/10.1177/0957650918818968.

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In this paper, a new configuration is proposed for Savonius rotors by installing two Counter-Rotating Savonius Rotors together and adding a V-shaped shield. For evaluating the performance of this type of turbine, turbulent unsteady flow around the rotor is simulated using ANSYS-Fluent 16.0 software. Numerical results of the torque and power coefficients of the turbine show a significant improvement in the aerodynamic performance compared to a single Savonius rotor. Effects of the V-shaped shield angle and distance from the rotors on the aerodynamic performance of the turbine are studied numerically. Analyzing the results show that in a design with a shield angle of 90° and with a shield distance of L = 1 D power coefficient increases by 80%.

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7

Gupta, Rajat, Bachu Deb y R. D. Misra. "Performance Analysis of a Helical Savonius Rotor with Shaft at 45° Twist Angle Using CFD". Mechanical Engineering Research 3, n.º 1 (1 de marzo de 2013): 118. http://dx.doi.org/10.5539/mer.v3n1p118.

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Helical Savonius rotor is considered to be superior to conventional Savonius rotor in terms of higher power coefficient (Cp) and better starting characteristic. However studies related to helical Savonius rotors is few. In view of this, in this paper, the performance of a helical Savonius rotor with shaft at 45° bucket twist angle for one complete cycle of rotation was analyzed using Computational Fluid Dynamics. A two-bucket helical Savonius rotor with shaft was designed using GAMBIT, having a height of 60 cm and diameter of 17 cm with 45° bucket twist angle. A three dimensional Computational Fluid Dynamics analysis using Fluent package was done to predict the performance of the rotor. Standard k-? turbulence model with second order upwind discretization scheme and standard wall condition was used. Grid independence test was also conducted to have the best meshing accuracy. Power coefficients (Cp) of the rotor at different tip speed ratios were evaluated for rotor angle variation from 0° to 180°. Cp at each rotor angle increased with increase of tip speed ratio up to an optimum tip speed ratio, but then decreased even if tip speed ratio was further increased. Moreover, the effect of rotor angle on Cp in a complete cycle of rotation was analyzed. Cp was found to be positive at all rotor angles, and higher values of Cp were obtained at rotor angles namely 45°, 90°, 225° and 270°, which would contribute maximum power production by the rotor. In addition to these, flow physics of the rotor was studied using tangential velocity plots w.r.t. rotor angle and path lines across the rotor. It was found that at 45°, 90° and 135° rotor angles, maximum concentration of the path lines near the tip of the blades in the upstream and downstream side of the rotor had occurred, which would be responsible for generation of maximum power coefficient in its clockwise rotation.

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8

Tang, Zhi Peng, Ying Xue Yao, Liang Zhou y Q. Yao. "Optimal Design of a New Type of Savonius Rotor Using Simulation Analysis". Key Engineering Materials 499 (enero de 2012): 120–25. http://dx.doi.org/10.4028/www.scientific.net/kem.499.120.

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In order to enhance the efficiency of the Savonius rotor, this paper designs a new type of Savonius rotor with a rectifier. By using Computational Fluid Dynamics software to simulate and optimize the various parameters which affect the efficiency of the rotor. The sliding mesh method is applied here. The Cp-λ curves of wind turbine with different structural parameters are obtained after numerical simulation of flow field. On this basis, this paper gets the optimal structural parameters. And the results indicated that this new type of Savonius rotor has great improvement of efficiency compared with the traditional Savonius-type rotor.

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9

Shishkin, Nikolai y Roman Il’in. "Experimental determination of the energy efficiency of rotors of vertical-axis wind turbines for autonomous power supply on land and at sea". MATEC Web of Conferences 245 (2018): 06016. http://dx.doi.org/10.1051/matecconf/201824506016.

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For the first time, experimental studies have been performed to assess the effect of flaps with triangular elements on the operation of the N-Darrieus and Savonius rotors. It has been established that the rotational speed of the original N-Darrieus and Savonius rotors having blades with flaps is greater than the rotation frequency of the N-Darrieus and Savonius rotors of the known construction by 18%, and the power factors of the N-Darrieus and Savonius rotors are for 17% and 19% more. Optimization of the geometrical parameters of the blades can lead to an increase in the power factor of the N-Darrieus rotor up to a value of 0.72, which is higher than the maximum possible value of 0.45 for the horizontal axis wind turbine. It is advisable to aggregate N-Darrieus rotors with Savonius rotors having a large starting torque. The upgraded N-Darrieus and Savonius rotors, as well as the combined rotors based on them, can be used in power supply systems for various objects on land and at sea.

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10

Sineglazov, Victor y Oleksandr Stanislavchuk. "Automation Disign of Hybrid Vertical-axial Rotors". Electronics and Control Systems 4, n.º 70 (1 de abril de 2022): 44–50. http://dx.doi.org/10.18372/1990-5548.70.16755.

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The paper proves the need to create vertical-axial rotors of wind power plants in the city strip, which can be placed on roofs, which makes it possible to increase their energy efficiency by 60-70%. It is shown that the placement of such rotors on the roofs has its own characteristics, which is the need to take into account the relief of the roof of the house, its surface area, rose and wind speed over it and others. Examples of wind farms are considered and it is proved that their energy efficiency can be increased by using hybrid vertical-axial rotors, which consist of a combination of Darrieus and Savonius rotors, where the Darrieus rotor is the main source (s) of wind energy conversion. in electric, while the rotor (s) of Savonius provide acceleration of Darrieus rotors. In order to improve the quality of design, an automated design system was developed, which includes the following blocks: determining the forces affecting the rotor, choosing the type of main and accelerating rotors, determining the optimal number of blades, optimal rotor placement, calculation of dynamic rotor characteristics, analysis of probable wind speed characteristics and strength calculation.

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11

Riady, Muhammad Ihsan, Dyos Santoso, Bazlina Dawami Afrah, Juliet Patricia Arsadha, Rupinder Rupinder y Miftahurrizka Afrah. "Studi eksperimental turbin angin kombinasi sumbu vertikal darrieus-savonius dengan poros kembar". Jurnal Teknik Kimia 28, n.º 1 (1 de marzo de 2022): 28–36. http://dx.doi.org/10.36706/jtk.v28i1.975.

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Energi angin merupakan salah satu sumber energi terbarukan yang melimpah di Indonesia. Potensi angin yang besar ini dapat dimanfaatkan dengan menggunakan turbin angin sebagai teknologi yang ramah lingkungan. Turbin angin Savonius dan turbin angin Darrieus merupakan turbin angin sumbu vertikal yang sesuai dengan karakteristik angin yang tersedia. Pada penelitian ini, turbin Darrieus dikombinasikan dengan turbin Savonius dalam rangka memperbaiki kemampuan self-starting turbin tersebut. Untuk mendapatkan performansi turbin yang lebih baik, daya yang dihasilkan oleh turbin Savonius juga dimanfaatkan sehingga tidak semata-mata berfungsi sebagai perangkat starting saja. Untuk tujuan itu, rotor Savonius dipasang pada poros dengan menggunakan one way bearing sehingga masing-masing rotor dapat beroperasi secara terpisah dan memiliki kecepatan putaran yang berbeda. Profil sudu yang digunakan dalam penelitian ini adalah airfoil NACA 0018 untuk rotor Darrieus dan modifikasi airfoil e377-il untuk rotor Savonius. Tujuan utama penelitian ini adalah mengevaluasi peningkatan peformansi yang diperoleh pada kombinasi turbin Darrieus Savonius poros kembar bila dibandingkan dengan kombinasi poros tunggal. Pada kombinasi poros tunggal, rotor Savonius terpasang tetap pada poros turbin Darrieus dan hanya digunakan sebagai starting, sedangkan pada kombinasi poros kembar, daya yang dihasilkan oleh kedua rotor dimanfaatkan. Hasil dari pengujian ini memperlihatkan bahwa daya yang dibangkitkan oleh kombinasi poros kembar mengalami peningkatan yang signifikan dibandingkan oleh kombinasi poros tunggal yaitu sebesar 28.54% (0.528 W) pada kecepatan angin 4.38 m/s.

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12

Shaughnessy, B. M. y S. D. Probert. "Partially-blocked savonius rotor". Applied Energy 43, n.º 4 (enero de 1992): 239–49. http://dx.doi.org/10.1016/0306-2619(92)90024-6.

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13

Golecha, K., M. A. Kamoji, S. B. Kedare y S. V. Prabhu. "Review on Savonius Rotor for Harnessing Wind Energy". Wind Engineering 36, n.º 6 (diciembre de 2012): 605–45. http://dx.doi.org/10.1260/0309-524x.36.6.605.

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Wind machines convert kinetic energy of the wind into usable form of mechanical energy or electrical energy. The Savonius rotor is a vertical axis wind machine which is simple in design. High starting torque characteristics make it suitable for standalone power generation as well as water pumping applications. This paper reviews the literature on the performance characteristics of the Savonius rotor. Multi-bladed rotor, multistage rotor, shape of the blade, use of deflecting plate, guide vanes and nozzle augmentation are several ways to enhance the performance characteristics. This review would help an engineer in building an improved Savonius rotor for a given application.

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14

Sahim, Kaprawi, Dyos Santoso y Dewi Puspitasari. "Investigations on the Effect of Radius Rotor in Combined Darrieus-Savonius Wind Turbine". International Journal of Rotating Machinery 2018 (2018): 1–7. http://dx.doi.org/10.1155/2018/3568542.

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Renewable sources of energy, abundant in availability, are needed to be exploited with adaptable technology. For wind energy, the wind turbine is very well adapted to generate electricity. Among the different typologies, small scale Vertical Axis Wind Turbines (VAWT) present the greatest potential for off-grid power generation at low wind speeds. The combined Darrieus-Savonius wind turbine is intended to enhance the performance of the Darrieus rotor in low speed. In combined turbine, the Savonius buckets are always attached at the rotor shaft and the Darrieus blades are installed far from the shaft which have arm attaching to the shaft. A simple combined turbine offers two rotors on the same shaft. The combined turbine that consists of two Darrieus and Savonius blades was tested in wind tunnel test section with constant wind velocity and its performance was assessed in terms of power and torque coefficients. The study gives the effect of the radius ratio between Savonius and Darrieus rotor on the performance of the turbine. The results show that there is a significant influence on the turbine performance if the radius ratio was changed.

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15

Zhang, Hongfu, Zhiqiang Li, Dabo Xin y Jian Zhan. "Improvement of Aerodynamic Performance of Savonius Wind Rotor Using Straight-Arc Curtain". Applied Sciences 10, n.º 20 (16 de octubre de 2020): 7216. http://dx.doi.org/10.3390/app10207216.

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A straight and an arc-shaped curtain are combined to enhance the aerodynamic performance of the Savonius wind rotor. The straight-arc curtain is placed in front of the Savonius wind rotor to reduce the negative moment on the convex blade and increase the positive moment on the concave blade. The static and dynamic performances of the Savonius wind rotor with and without the curtain are investigated based on the computational fluid dynamics method. The results show that the static torque is higher with the curtain than without it at the same angle-of-attack. The maximum mean power coefficient with the curtain is increased by about 50% compared with conventional Savonius wind rotor. Additionally, the flow field around the rotor with the straight-arc curtain is presented, and the flow control mechanics of the straight-arc curtain are discussed.

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16

Adhikary, Anik, Md Quamrul Islam y Mohammad Ali. "PERFORMANCE OF A STATIONARY SAVONIUS ROTOR WITH CIRCULAR ARC BLADE PROFILE". Journal of Mechanical Engineering 43, n.º 2 (1 de febrero de 2014): 77–81. http://dx.doi.org/10.3329/jme.v43i2.17830.

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Static torque and drag coefficients of a stationary Savonius rotor with circular arc blade profile havebeen investigated by measuring the pressure distribution on the blade surfaces for different rotor angles.Experiments have been performed at a Reynolds Number 1.8×105 with rotors having no overlap. Resultsindicate that static torque coefficients vary considerably with the rotor angle.DOI: http://dx.doi.org/10.3329/jme.v43i2.17830

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17

Ahmad, Elsadic Salim. "A Study of the Influence of Guide Vane Design to Increase Savonius Wind Turbine Performance". Modern Applied Science 9, n.º 11 (30 de septiembre de 2015): 222. http://dx.doi.org/10.5539/mas.v9n11p222.

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This work experimentally studied the influence of guide vane design to increase Savonius rotor performance. Guide vane is one of additional device that its function is for directing wind stream on to concave blade and deserves as obstacle of the wind that flowing on to convex blade. That way increased wind speeds to the rotor, consequently it produced higher power coefficient and the Savonius rotor performed better performance. Four designs of guide vane were arranged in this study. They are basic design of guide vane and basic design of guide vane that added a tilt angle on the top and bottom sides by 15°, 30°, and 45°. The result concludes that guide vane affects the performance of Savonius rotor. The power that generated by the rotor with guide vanes increase significantly compared with Savonius rotor without guide vane. The maximum improvement was attained up to 65.89%.

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18

Al-Ghriybah, Mohanad, Mohd Fadhli Zulkafli, Djamal Hissein Didane y Sofian Mohd. "Performance of Double Blade Savonius Rotor at Low Rotational Speed". Journal of Computational and Theoretical Nanoscience 17, n.º 2 (1 de febrero de 2020): 729–35. http://dx.doi.org/10.1166/jctn.2020.8711.

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The performance of the single and double blade Savonius rotors are numerically analyzed using the K-ε/realizable turbulence model. The computations are implemented at different values of tipspeed ratio from 0.2 to 0.4 with a step of 0.05. Both rotors have the same dimensions with an external overlap between their blades equals 0.02 m. The results indicate that the double blade rotor performs better than the single blade rotor in terms of power coefficient. In addition, the torque coefficient is improved at all tested values of tip-speed ratio. Furthermore, the results of the simulation show that the maximum power coefficient was 0.163 at tip-speed ratio = 0.4 for the double blade rotor, whereas the maximum improvement of the double blade rotor occurs at tipspeed ratio = 0.2 with a percentage of 11.86% compared to the single blade rotor. Moreover, the highest value of the torque coefficient was 0.524 at tip-speed ratio = 0.2 for the double blade rotor.

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19

Harsanto, Tedy, Haryo Dwi Prananto, Esmar Budi y Hadi Nasbey. "Design and Contruction of Vertical Axis Wind Turbine Triple-Stage Savonius Type as the Alternative Wind Power Plant". KnE Energy 2, n.º 2 (1 de diciembre de 2015): 172. http://dx.doi.org/10.18502/ken.v2i2.373.

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A vertical axis wind turbine triple-stage savonius type has been created by using simple materials to generate electricity for the alternative wind power plant. The objective of this research is to design a simple wind turbine which can operate with low wind speed. The turbine was designed by making three savonius rotors and then varied the structure of angle on the three rotors, 0˚, 90˚ and 120˚. The dimension of the three rotors are created equal with each rotor diameter 35 cm and each rotor height 19 cm. The turbine was tested by using blower as the wind sources. Through the measurements obtained the comparisons of output power, rotation of turbine, and the level of efficiency generated by the three variations. The result showed that the turbine with angle of 120˚ operate most optimally because it is able to produce the highest output power and highest rotation of turbine which is 0.346 Watt and 222.7 RPM. Keywords: Output power; savonius turbine; triple-stage; the structure of angle

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20

Blanco, Javier, Juan de Dios Rodriguez, Antonio Couce y Maria Isabel Lamas. "Proposal of a Nature-Inspired Shape for a Vertical Axis Wind Turbine and Comparison of Its Performance with a Semicircular Blade Profile". Applied Sciences 11, n.º 13 (4 de julio de 2021): 6198. http://dx.doi.org/10.3390/app11136198.

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In order to improve the efficiency of the Savonius type vertical axis wind turbine, the present work analyzes an improvement based on an innovative rotor geometry. The rotor blades are inspired on an organic shape mathematically analyzed, the Fibonacci’s spiral, presented in many nature systems as well as in art. This rotor was analyzed in a wind tunnel and through a CFD model. The power coefficients at different tip speed ratios (TSR) were characterized and compared for the Savonius turbine and two versions using the Fibonacci’s spiral. One of the proposed geometries improves the performance of the Savonius type. Particularly, the optimal configuration lead to an improvement in maximum power coefficient of 14.5% in the numerical model respect to a conventional Savonius turbine and 17.6% in the experimental model.

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21

Rajkumar, M. Jaya y U. K. Saha. "Valve-Aided Twisted Savonius Rotor". Wind Engineering 30, n.º 3 (mayo de 2006): 243–54. http://dx.doi.org/10.1260/030952406778606269.

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22

Varia, Manthan N. "Aerodynamic Analysis of Novel Savonius Rotor". International Journal for Research in Applied Science and Engineering Technology 9, n.º 11 (30 de noviembre de 2021): 1055–61. http://dx.doi.org/10.22214/ijraset.2021.38979.

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Abstract: Wind is a renewable form of energy that holds vital solutions to energy crisis that will be faced in the possible future. Apart from the viable lift based turbines that we have been working on, research can be done on drag based turbines that can be installed in urban areas for short power requirements. The research aims at developing a novel design for Savonius type rotor which will help to improve the power producing characteristics of the turbine. CFD fluent analysis will help in analysis of the proposed blade shape. The results explain how the combination of elliptical profiled blade improves coefficient of power for Savonius type rotor. Keywords: Aerodynamics, Wind Energy, Savonius, VAWT, Wind Turbine

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23

Ogawa, T., H. Yoshida y Y. Yokota. "Development of Rotational Speed Control Systems for a Savonius-Type Wind Turbine". Journal of Fluids Engineering 111, n.º 1 (1 de marzo de 1989): 53–58. http://dx.doi.org/10.1115/1.3243598.

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An attempt is made here to increase the output of a Savonius rotor by using a flow deflecting plate. When the deflecting plate is located at the optimum position, the rotor power increases nearly 30 percent over that when no deflecting plate is present. The rotor torque was found to become almost zero, when the plate is placed just in front of the rotor. In addition, two systems to control the rotational speed of a Savonius rotor are developed. These permit the rotor to be stopped in strong wind. Operating characteristics of the two control systems are investigated.

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24

Sahim, Kaprawi, Dyos Santoso y Agus Radentan. "Performance of Combined Water Turbine with Semielliptic Section of the Savonius Rotor". International Journal of Rotating Machinery 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/985943.

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The Darrieus turbine is a suitable power generation in free stream flow because it is simple in construction, but it has the disadvantage of its small starting torque. The Savonius turbine has a high starting torque but the efficiency is smaller than that of Darrieus turbine. To improve the starting torque of Darrieus turbine, the Savonius buckets are introduced into the Darrieus turbine and the combined turbine is called Darrieus-Savonius turbine. In this study, three semielliptic sections of aspect ratio 0.8 were used for Savonius bucket while the Darrieus blade used three wings of airfoil NACA 0015. The Darrieus-Savonius turbine’s performances were studied experimentally in an irrigation canal of South Sumatera, Indonesia. The results show that the distance of Savonius buckets from the shaft centre influences performance of combined turbine, and the attachment angle of Savonius rotor made important variation of turbine performance.

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25

Mohd Halmy, Muhammad Syahmy, Djamal Hissein Didane, Lukmon Owolabi Afolabi y Sami Al-Alimi. "Computational Fluid Dynamics (CFD) Study on the Effect of the Number of Blades on the Performance of Double-Stage Savonius Rotor". CFD Letters 13, n.º 4 (17 de abril de 2021): 1–10. http://dx.doi.org/10.37934/cfdl.13.4.110.

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Wind energy is known as renewable energy with the properties of the free, abundant and readily available source of energy. Wind power has now been seen as an alternative way to generate electricity. However, the existing wind turbines to harness this energy, which is used to transform wind kinetic energy into electricity still suffer low conversion capabilities. This study is therefore set out to evaluate the performance of a double-stage Savonius-type rotor while aiming to examine the effectiveness of this technique in increasing the efficiency while overcoming the inherent low inefficiency of the Savonius rotor. The simulations involved the use of the K-omega SST as the turbulent viscosity model. Three simulation models based on a different number of blades on the double-stage model are tested in terms of torque, power, torque coefficient and power coefficient. It is concluded that the double-stage technique was capable of enhancing the performance of the Savonius rotor. It was observed that more blades on a double-stage rotor have a negative effect on the performance of the Savonius rotor in terms of both torque efficiency and power efficiency. Comparing the three models, it was found that the two-blade model of the double-stage produced more torque and power output compared to the other three-blade and four-blade models of the double-stage Savonius rotor. Furthermore, the highest conversion efficiency in terms of power among all models occurs at the TSR of 0.6 with a corresponding maximum power coefficient of 18.4%.

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26

Mohan Kumar, Palanisamy, Mohan Ram Surya, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna y He Wei. "Computational Optimization of Adaptive Hybrid Darrieus Turbine: Part 1". Fluids 4, n.º 2 (17 de mayo de 2019): 90. http://dx.doi.org/10.3390/fluids4020090.

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Darrieus-type Vertical Axis Wind Turbines (VAWT) are promising for small scale decentralized power generation because of their unique advantages such as simple design, insensitive to wind direction, reliability, and ease of maintenance. Despite these positive aspects, poor self-starting capability and low efficiency in weak and unsteady winds deteriorate further development. Adaptive Hybrid Darrieus Turbine (AHDT) was proposed by the author in the past study as a potential solution to enhance low wind speed characteristics. The objective of the current research is to optimize the parameters of AHDT. AHDT integrates a dynamically varying Savonius rotor with a Darrieus rotor. A fully detailed 2D numerical study employing Reynold-Averaged Navier Stokes (RANS) is carried out to investigate the impact of the Darrieus rotor diameter (DR) on the Savonius rotor (DT) with regard to hybrid turbine performance. The power coefficient of the Darrieus rotor is evaluated when the Savonius rotor is in the closed condition (cylinder) of various diameters. The influence of Reynolds number (Re) on the torque coefficient is examined. Power loss of 58.3% and 25% is reported for DR/DT ratio of 1.5 and 2 respectively for AHDT with solidity 0.5 at 9 m/s. The flow interaction between the Savonius rotor in closed configuration reveals the formation of von Karman vortices that interact with Darrieus blades resulting in flow detachment. An optimum diametrical ratio (DR/DT) of 3 is found to yield the maximum power coefficient of the Darrieus rotor.

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27

Li, Yan, Jun Rui Chai, Fa Ning Dang, Fang Feng y Wen Qiang Tian. "Numerical Simulation on Static Performance of Savonius Rotor Based on Different Turbulence Models". Advanced Materials Research 488-489 (marzo de 2012): 1238–42. http://dx.doi.org/10.4028/www.scientific.net/amr.488-489.1238.

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With the advance of computer technology, numerical simulations were widely used for designing wind turbine. Savonius rotor is a kind of drag type wind turbine often used for water pumping for its good torque performance. In this study, numerical computations were carried out based on three different turbulence models including Splart-Allaras (S-A) model, k-εmodel and k- ωmodel to compute the static torque performance at different attack angles. Flow fields around the Savonius rotor were obtained. Comparing the computation results with the experimental results, the effects of turbulence models on the static performances of the Savonius rotor were discussed. The simulation result based on k-ω model was in agreement with test data generally.

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28

Guseva, Yu V., S. A. Kostryukov y A. R. Vasilev. "Laboratory model of the Savonius rotor". Power engineering: research, equipment, technology 24, n.º 3 (14 de junio de 2022): 83–90. http://dx.doi.org/10.30724/1998-9903-2022-24-3-83-90.

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THE PURPOSE. Increasing the efficiency and efficiency of power plants based on renewable energy sources should be carried out by improving technological, constructive, organizational, legal, technical and economic measures. Proposals are given for the development of approaches to assessing the efficiency of wind power plants based on the Savonius rotor. The design parameters are substantiated and a physical model is created for a comprehensive study and performance characteristics in laboratory conditions.METHODS. Based on the methods of physical and mathematical modeling of structures and profiles of wind turbine blades, the technical and economic indicators of various profiles of the blades of the Savonius rotor are determined.RESULTS. The theoretical substantiation of the design and various profiles of the blades of the Savonius rotor is carried out. On the basis of a comprehensive study of performance characteristics in laboratory conditions, the values of the wind energy efficiency coefficient, the rotation frequency of the wind wheel profile, and electric power were established.CONCLUSION. The results of the study can be applied to substantiate the widespread use and creation of wind power plants with a Savonius rotor to ensure high-quality and reliable power supply to remote consumers of electric energy, the creation of isolated power systems and the further development of alternative energy sources in the domestic electric power industry

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29

Brusca, S., A. Galvagno, R. Lanzafame, S. Mauro y M. Messina. "How to Increase Savonius Power Coefficient: Ducted Rotor Performance with Different Overlap Ratios". Journal of Physics: Conference Series 2385, n.º 1 (1 de diciembre de 2022): 012105. http://dx.doi.org/10.1088/1742-6596/2385/1/012105.

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Abstract The use of ducted configuration to increase the efficiency of wind turbine rotors is gaining wide attention in the scientific community. Specifically for mini and micro rotors in urban environment applications this solution demonstrated to be very attractive. The possibility to overcome the Betz limit for power coefficient was widely demonstrated in ducted horizontal axis wind turbines. However, very few studies have dealt with ducted Savonius rotor despite these rotors represented an efficient solution for urban environment thanks to their simplicity, their cheapness and the low cut in velocity in highly turbulent conditions as well. Furthermore, the ducted Savonius concept, might be applicable to oscillating water column wave energy devices, thanks to its self-rectifying capability and simplicity. For these reasons, the authors carried out an experimental campaign to verify the impact of ducting the Savonius rotor, thus leading the way for a possible exploitation of this configuration in many practical applications. Specifically, The present paper deals with a study of ducted Savonius type air turbine performance. In particular, turbine performance was studied as a function of turbine overlap ratio. Four overlap ratios were tested: 0, 1/6, 1/3 and 1/2. A specific experimental setup was built to test ducted turbine, while bare turbine performance was measured using a wind tunnel. All tests were performed at fixed air velocity: 5 m/s. On the basis of the results, it is possible to state that ducted turbine performance is higher than bare turbine performance, at all tip speed ratios and for all overlap ratios. The optimal turbine overlap ratio is equal of 1/3.

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30

Alhakiem, Faris Zaiem, Mietra Anggara y Sopyan Ali Rohman. "ANALISIS SUDUT LENGKUNG SUDU HORIZONTAL AXIS SAVONIUS WATER TURBINE PADA PIPA AIR VERTIKAL MENGGUNAKAN COMPUTATIONAL FLUID DYNAMIC (CFD)". Hexagon Jurnal Teknik dan Sains 2, n.º 1 (5 de enero de 2021): 8–11. http://dx.doi.org/10.36761/hexagon.v2i1.870.

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Sumber daya air di Indonesia sangat menjanjikan untuk digunakan sebagai sumber energi terbarukan melihat curah hujan yang tinggi dan dapat dimanfaatkan untuk pembangkit listrik pada saluran pembuangan air hujan berskala pico. Turbin savonius merupakan salah satu pembangkit listrik yang mampu memanfaatkan energi kinetik pada aliran air yang berkecepatan rendah dan ketinggian head yang rendah. Penelitian terdahulu dilakukan untuk mengetahui desain yang efisien pada turbin savonius, salah satunya memuntir rotor dan menghasilkan hasil yang lebih baik dibandingkan model rotor biasa. Pada penelitian ini bertujuan untuk mengetahui pengaruh sudut pada sudu rotor terhadap performa dari turbin savonius pada aliran pipa vertikal. Pengujian ini dilakukan menggunakan metode Computational Fluid Dynamic (CFD) yang membantu dalam memahami hasil teori dan eksperimen menggunakan komputer yang dapat melakukan simulasi aliran fluida. Variabel yang digunakan pada penelitian ini yaitu besar sudut sudu pada rotor sebesar 110°, 120°, 130° dan 140°. Hasil yang didapatkan pada penelitian ini yaitu rotor dengan sudut sudu 110° memiliki performa terbaik dibandingkan dengan yang lain dengan nilai Torsi 0.36 Nm dan Cp 0.68.

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31

Samiran, N. Afzanizam, A. A. Wahab, Mohd Sofian y N. Rosly. "Simulation Study on the Performance of Vertical Axis Wind Turbine". Applied Mechanics and Materials 465-466 (diciembre de 2013): 270–74. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.270.

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The present study considered the design improvement of Savonius rotor, in order to increase the efficiency of output power. An investigation was conducted to study the effect of geometrical configuration on the performance of the rotor in terms of coefficient of torque, coefficient of power and power output. Modification of conventional geometry has been designed by combining the effect of number of blades and shielding method. CFD simulation was conducted to analyze the flow characteristic and calculate the torque coefficient of all the rotor configurations. The continuity and Reynolds Averaged Navier-Stokes (RANS) equations and realizable k-ε epsilon turbulence model are numerically solved by commercial software Ansys-Fluent 14.0. The results obtained by transient and steady method for the conventional two bladed Savonius rotor are in agreement with those obtained experimentally by other authors and this indicates that the methods can be successfully applied for such analysis. The modified 3 and 4 bladed rotors with hybrid shielding method gave the highest maximum power coefficient which 0.37 at TSR 0.5 and output power exceed 4 watts with rotor dimensions of 0.2m width and 0.2m height. This blade configuration also is the best configuration by several percentages compared to the other model from the previous study

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32

Abdel-Fattah Mahrous. "Computational Fluid Dynamics Study of a Modified Savonius Rotor Blade by Universal Consideration of Blade Shape Factor Concept". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 85, n.º 1 (29 de julio de 2021): 22–39. http://dx.doi.org/10.37934/arfmts.85.1.2239.

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This work aims to investigate computationally the performance of Savonius vertical axis wind turbine having a new design feature for its blade geometry. The proposed design is based on a universal consideration of blade shape factor concept for the Savonius rotor blade. A blade shape factor ranges from zero to infinity, or vice versa, is considered in a single blade of the modified Savonius rotor. This means that each point in the two-dimensional blade profile of the suggested blade design has a single value of blade shape factor that is defined based on the dimensions of conventional semi-circular blade. The computational results of the proposed blade shape design, having blade shape factor varying from infinity to zero, showed an improvement in turbine performance as compared to conventional blade shape design. Moreover, increasing the operating range of Savonius wind turbine is expected.

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33

Irawan, Elysa Nensy, Sandro Sitompul, Ken-Ichiro Yamashita y Goro Fujita. "The Effect of Rotor Radius Ratio on The Performance of Hybrid Vertical Axis Wind Turbine Savonius-Darrieus NREL S809". Journal of Energy and Power Technology 05, n.º 01 (2 de enero de 2023): 1–12. http://dx.doi.org/10.21926/jept.2301001.

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This research aims to know the effect of the Rotor Radius Ratio on the performance of the hybrid Vertical Axis Wind Turbine Savonius-Darrieus NREL S809 model using the Computational Fluid Dynamics method. Two-bladed Savonius is used as an internal rotor, and three-bladed Darrieus NREL S809 as an external rotor. Turbine model performance is analyzed through the value of the Moment Coefficient and Power Coefficient. The result shows that the increase in the Rotor Radius Ratio value causes an increase in the initial Moment Coefficient but a decrease in the maximum Power Coefficient value. At the initial TSR, the Rotor Radius Ratio 0.5 model has the best Moment Coefficient value among all variations but has the lowest maximum Power Coefficient value.

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34

Ohaji, Denis E., M. Musa, M. Momoh, D. O. Akpootu y G. Bello. "CONSTRUCTION AND PERFORMANCE EVALUATION OF TWO STAGED THREE BLADED SAVONIUS VERTICAL AXIS WIND ENERGY CONVERSION SYSTEM". FUDMA JOURNAL OF SCIENCES 6, n.º 6 (1 de enero de 2023): 76–88. http://dx.doi.org/10.33003/fjs-2022-0606-1143.

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This study is intended to increase the rotor performance of the Savonius wind rotor, by increasing the numbers of blades of the already existing two blades Savonius vertical axis wind turbines (VAWTs) to three which was designed to increase the Savonius wind rotor performance. Two stage three bladed wind turbine system has been designed and constructed. The system was made up of six split drums which were welded together to form a concave shape to capture wind from all directions, with a shaft to pass through the midst of the welded drums which was then mounted on a tower of about 15 m high, which in turn will cause the rotor to rotate. This was then connected to a 12 V Generator. The wind turbine converts the kinetic energy available in the wind to produce electricity, using the Generator with output power of 60 W. The results obtained showed that the system was able to accept wind from any direction and commenced rotation as soon as the wind speed of 3.3 m/s (cut in) was available at the site. The minimum and maximum power outputs of 5.14 W and 13.34 W, corresponding to wind speeds of 7.2 m/s and 9.4.5 m/s were recorded respectively. Similarly, for a rotation per minute of 811 rpm a voltage of 7.14 V was generated. Hence for a two stages three blades Savonius the performance was 12.2 %, as against a single stage two blades Savonius whose performance was 7%, a deviation of 5.2 %.

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35

Mrigua, Khalid, Abdelghani Toumi, Mounia Zemamou, Bader Ouhmmou, Yahya Lahlou y Mohammed Aggour. "CFD Investigation of A New Elliptical-Bladed Multistage Savonius Rotors". International Journal of Renewable Energy Development 9, n.º 3 (29 de junio de 2020): 383–92. http://dx.doi.org/10.14710/ijred.2020.30286.

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The Savonius-conventional wind turbine is a class of wind turbines designed with a vertical axis. It has a good starting capacity and an insensitivity to wind direction. It works relatively at low wind speed in an easy installation. Savonius wind turbine faces major drawbacks, including some of the low efficiency and high negative torque created by the returning blade. Many attempts have been undertaken to optimize the blade’s shape to increase the performance of these wind turbines. The vertical axis is still under development. The elliptical-blades with a cut angle equal 47.50° have recently shown enhanced performance. In this study, we investigate the effect of Elliptical-bladed multistage Savonius Rotors (rotor aspect ratio, stage aspect ratio) on the performance by means of numerical simulation. The results obtained by comparison of one, two, and three-stage rotors indicate that the maximum power coefficient increase with a number of the stages (for the rotors with similar RAR of 0.7). Moreover, for the rotors with similar SAR of 0.7, the two stages have the highest performance than others.©2020. CBIORE-IJRED. All rights reserved

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36

Vasileios, Chasiotis, Tachos Nikolaos y Filios Andronikos. "Computational Performance Analysis of a Two-slotted Bucket Savonius Rotor". WSEAS TRANSACTIONS ON FLUID MECHANICS 17 (24 de marzo de 2022): 49–59. http://dx.doi.org/10.37394/232013.2022.17.5.

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The objective of the current computational study is to predict the performance output of a modified two-bucket Savonius rotor. Each bucket consists of three arc-type blades of different radius which is determined by the slot width ratio, in the range of 0.05 to 0.15 and the slot central angle, in the range of 0 to 20 deg. Nine configurations are designed with a fixed rotor diameter and a variable slot width and slot central angle, aiming to resolve the performance output and investigate the effect of the two previous parameters on the power and the static torque coefficients. The commercial CFD package Fluent® is used to solve the unsteady Reynolds-Averaged Navier-Stokes equations, along with Spalart-Allmaras turbulence model. Initially, a standard Savonius rotor, was used to validate the computational procedure using experimental results available in literature. Next, the same validated model is used to resolve the designed slotted bucket configurations. The performance of the examined slotted bucket configurations indicates improved self-starting characteristics, but a lower power coefficient compared with the solid bucket Savonius rotor. Lower values of slot width ratio have improved output performance while the slot central angle, does not greatly affect the overall performance of slotted bucket rotor

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37

Basuki, Mohammad Munib Rosadi, Retno Eka Pramitasari y Fajar Satriya Hadi. "ANALISIS PERFORMA KINERJA TURBIN ANGIN SAVONIUS 2 SUDU". Discovery : Jurnal Ilmu Pengetahuan 5, n.º 2 (18 de octubre de 2020): 58–63. http://dx.doi.org/10.33752/discovery.v5i2.995.

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Abstract: Renewable energy sources are energy sources that can replace the use and use of fossil energy sources where they are very abundant and have not been widely used for their existence. Therefore, to bring up new ideas in terms of creating or changing renewable energy, there needs to be a match between the education curriculum and market needs. So to arouse the enthusiasm and motivation of students in the teaching and learning process, especially in the energy conversion machine course for mechanical engineering students, it needs media and learning methods. The purpose of this research is to know how to design a savonius wind turbine props, and the working principle, and analyze the performance of the wind turbine. The sequence of the process of making savonius wind turbines comprises of making: (1) frameworks and machine tables, (2) chimneys, (3) duct, (4) installation of fans, (5) turbine holder (6) two blades savonius turbines and servo motor holder. The working principle of a wind turbine is a turbine rotation caused by the wind being transmitted to the generator rotor, where the generator has a copper coil that functions as a stator which will produce an electric voltage. From this research produced a savonius wind turbine tool which is used as a learning medium in the Mechanical Engineering Study Program. From the results of savonius type wind turbine test equipment produced the following data: maximum voltage of 10 volts, wind speed of 8.5 m / s, rotor generator rotation of 2734 rpm and power of 340 watts. Keywords: Energy, Turbine, Wind, Savonius Abstrak: Sumber energi terbarukan adalah sumber energi yang dapat menggantikan pemanfaatan dan penggunaan sumber energi fosil dimana keberadaannya sangat melimpah dan belum banyak digunakan akan keberadaannya. Oleh karena itu untuk memunculkan ide ide baru dalam hal menciptakan atau mengubah energi terbarukan ini perlu adanya kesesuaian antara kurikulum pendidikan dengan kebutuhan pasar. Maka untuk membangkitkan semangat dan motivasi mahasiswa dalam proses belajar mengajar khususnya dalam mata kuliah Mesin Konversi Energi bagi mahasiswa teknik mesin maka perlu media dan metode pembelajaran. Tujuan dari penelitian ini adalah mengetahui cara mendesain sebuah alat peraga turbin angin savonius, mengetahui prinsip kerja, dan menganalisa dari performa kinerja dari turbin angin tersebut. Urutan proses pembuatan turbin angin savonius adalah (1) pembuatan kerangka dan meja mesin, (2) pembuatan cerobong angin, (3) pembuatan duct, (4) pemasangan kipas angin, (5) pembuatan dudukan turbin, (6) pembuatan turbin savonius 2 sudu dan pembuatan dudukan motor servo. Prinsip kerja turbin angin adalah putaran turbin yang disebabkan oleh angin diteruskan ke rotor generator, dimana generator memiliki lilitan tembaga yang berfungsi sebagai stator yang akan menghasilkan tegangan listrik. Dari penelitian tersebut dihasilkan sebuah alat turbin angin savonius yang digunakan sebagai media pembelajaran di Program Studi Teknik Mesin. Dari hasil pengujian alat turbin angin tipe savonius menghasilkan data sebagai berikut: tegangan maksimal sebesar 10 volt, kecepatan angin 8.5 m/s, putaran rotor generator 2734 rpm dan daya sebesar 340 watt. Kata kunci: Energi, Turbin, Angin, Savonius

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Im, Heejeon y Bumsuk Kim. "Power Performance Analysis Based on Savonius Wind Turbine Blade Design and Layout Optimization through Rotor Wake Flow Analysis". Energies 15, n.º 24 (14 de diciembre de 2022): 9500. http://dx.doi.org/10.3390/en15249500.

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Savonius vertical axis wind turbines have simple structures, can self-start in environments with low wind speed and strong turbulence intensity, and can be installed at low costs. Therefore, installation is possible in urban centers with low wind speeds, which may contribute to the construction of a decentralized power system. Savonius wind turbines are operated by drag force, with the blades moving in the same direction as the flow current providing the thrust force and those moving in the opposite direction of the wind being rotated by the drag force. In this study, the Savonius wind turbine design was examined to develop a stable wind turbine for use in urban centers at low wind speeds. The Savonius rotor design variables (aspect and overlap ratios) and blade forms (semi-circular, Bach, and elliptical type) were examined using computational fluid dynamics analysis. Moreover, a rotor capable of providing the target output was designed and maximum rotor efficiency of 18% was realized. Further, changes to the flow corresponding with various turbine layouts were analyzed to determine the arrangement that would maximize turbine performance. The results showed that the maximum efficiency of the turbines was in the 17–19% range and without significant variation.

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39

Mohammed, Gwani, Mamuda Buhari, Umar Muhammed Kangiwa y John Danyaro. "Design, Fabrication and Performance Evaluation of Hybrid Vertical Axis Wind Turbine". International Journal for Modern Trends in Science and Technology 6, n.º 6 (28 de junio de 2020): 80–86. http://dx.doi.org/10.46501/ijmtst060618.

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Vertical axis wind turbines (VAWT) have attracted a lot of attention recently as an efficient tool in harnessing wind energy; however these types of wind turbine are faced with some challenges which affect their overall performance. The Darrieus rotor has difficulty to self-start by itself while the Savonius rotor has low efficiency. The performance of these turbines can be improved by combining the two VAWTs as one system. This paper presents the design of a hybrid VAWTs turbine. The Hybrid VAWTs combines the Darrieus rotor and the Savonius rotor as a single system to produce a high starting torque and enhanced efficiency. The Savonius rotor is placed at the centre of the three vertical blades of the Darrieus H-rotor to form the hybrid VAWTs. The hybrid VAWT was tested at four different wind speed i.e. V = 4.80 m/s, 4.50 m/s, 4.30 m/s and 3.90 m/s respectively. The performance of the hybrid VAWT was compared with the conventional straight bladed VAWT under similar experimental conditions. The obtained results showed that there is substantial improvement in the self-starting ability and coefficient of power (Cp). At V = 4.80 m/s, the Cp values for hybrid VAWT increased by 92% compared to straight bladed H-rotor VAWT. Similar improvement was also observed at wind speed of V = 4.50 m/s, 4.30 m/s, and 3.90 m/s where the Cp values increases by 71%, 10%, and 67% respectively compared to the straight bladed H-rotor.

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40

Zeroual, Aouachria, Belalmi Rabab, Haddad Louiza y Tighaza Sihem. "New Blade Profile of VAWT: Experimental and Analysis to Introduce It in Urban Cites". International Journal of Design & Nature and Ecodynamics 16, n.º 1 (28 de febrero de 2021): 69–76. http://dx.doi.org/10.18280/ijdne.160109.

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The use of wind turbines for small-scale and urban applications is a topic that is receiving increasing attention. The use of wind turbines for small-scale and urban applications is a topic that is receiving increasing attention. This work concerns the Savonius rotor. It is divided into three parts. The first one consists in an original experiment which has led to the direct measurement of the pressure field on the blades of a rotating Savonius rotor. In the second part, the results are introduced in a generalized model to calculate the efforts which generate the vibrations at the rotor supports. This study explains well the vibratory behaviour of the rotor. Finally, in a third part an experiment analysis of an adequate system of a suspension to stabilise or avoid these vibrations is proposed. This study explains clearly the vibratory behaviour of the rotor.

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41

Huang, Yong Yu, Qiu Yun Mo, Xu Zhang y Zu Peng Zhou. "Numerical Simulations of Spherical Vertical-Axis Wind Rotor". Applied Mechanics and Materials 291-294 (febrero de 2013): 456–60. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.456.

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In this paper, the effects of the shape of three types of the blade on power coefficient of Savonius rotors are studied by simulating the model using numerical simulation under the same conditions. For this purpose, three spherical rotors with different configurations but identical number of stages and blades, aspect ratio and overlap keeping the identical projected area of each rotor are constructed. The geometries of blade of the three rotors are a plane, a semi-circle and a quarter of sphere. The building data are calculated on the basis of the nominal wind velocity V= 10m/s and the speed ratio λ= 0.3 with an industrial flow simulation code (ANSYS-Fluent). The result shows that the rotor with semicircular blades has a higher value of power coefficient in comparison with other rotors.

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42

Ray, Santanu Basu, Arka Banerjee, Rajeev Ranjan, Tanmoy Maiti y Riju Ganguly. "Recent Advancement in Savonius Wind Turbine- A Review". Dec 2022 - Jan 2023, n.º 31 (21 de enero de 2023): 28–36. http://dx.doi.org/10.55529/jeimp.31.28.36.

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In the steps to save our earth from global warming every nation focused on their own way to promote green energy among which the Savonius vertical axis wind turbine is one of the excellent viable solutions for scavenging wind energy in a downtown background, due to distinctive characteristics such as compactness, self-starting ability at light wind, minimum noise level, with relatively reasonable price and simple assembly. However, the traditional Savonius Wind Turbines with semicircular blades has a proportionately low power coefficient together with a high negative torque produced by the returning blade is a crucial disadvantage of this rotor. This work focuses on reviewing and giving an overview on the form of the wings of Savonius Vertical Axis Wind Turbine. This paper also aims to give a run through of the several augmentation approaches used in Savonius rotor over the last four decades. In this paper, a brief on all possible segments and parts of the machine is given after a brief analysis and research on each topic.

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43

Eftekhari, Hesam, Abdulkareem Sh Mahdi Al-Obaidi y Shahrooz Eftekhari. "Aerodynamic Performance of Vertical and Horizontal Axis Wind Turbines: A Comparison Review". Indonesian Journal of Science and Technology 7, n.º 1 (16 de diciembre de 2021): 65–88. http://dx.doi.org/10.17509/ijost.v7i1.43161.

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The need for energy and electricity has been increasing globally, and this means more power is required from the power plants. Power plants, however, will then continue harming the earth because of the greenhouse gasses produced while generating energies that contribute to global warming. Using renewable sources to produce clean energies is one of the sustainable methods to deal with such challenges. Wind energy is one of the renewable sources, which is accessible anywhere on earth, creating green energy. Wind turbines are mainly categorized into Horizontal Axis Wind Turbines (HAWT) and Vertical Axis Wind Turbines (VAWT). This paper firstly presents a general comparison between the HAWTs and VAWTs. Then, it presents mathematical modelling for the aerodynamic factors of HAWT and Darrieus VAWT to assist the researchers to understand some key design aspects of wind turbines, such as lift/drag ratio, tip speed ratio, power coefficient, and torque coefficient. Also, this paper presents a review of the aerodynamic performance of the recent VAWT designs to help researchers to identify and choose the best model among the Savonius and Darrieus rotors for further development or designing a new model at different wind conditions. This comparison review shows that for a large scale HAWT upwind 3 bladed wind turbines are the most optimum. The helical Savonius rotors perform better by having positive torque coefficient at all azimuth angles. Moreover, helical Darrieus was found to produce lesser noise and suitable for conventional areas. hybrid Savonius-Darrieus rotors can solve the self-starting challenge of the VAWTs, and they are suitable at low wind speeds. At last, this review shows some of the recent hybrid Savonius-Darrieus rotors which would help to solve the low efficiency of Savonius rotor and self-starting challenge of Darrieus rotors.

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44

Aldoss, Taha K. y Mohamed A. Kotb. "Aerodynamic Loads on a Stationary Savonius Rotor". JSME international journal. Ser. 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties 34, n.º 1 (1991): 52–55. http://dx.doi.org/10.1299/jsmeb1988.34.1_52.

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45

Deda Altan, Burcin, Gurkan Altan y Volkan Kovan. "Investigation of 3D printed Savonius rotor performance". Renewable Energy 99 (diciembre de 2016): 584–91. http://dx.doi.org/10.1016/j.renene.2016.07.043.

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46

Kotb, M. A. y T. K. Aldoss. "Flowfield around a partially-blocked Savonius rotor". Applied Energy 38, n.º 2 (enero de 1991): 117–32. http://dx.doi.org/10.1016/0306-2619(91)90070-e.

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47

Gupta, R., A. Biswas y K. K. Sharma. "Comparative study of a three-bucket Savonius rotor with a combined three-bucket Savonius–three-bladed Darrieus rotor". Renewable Energy 33, n.º 9 (septiembre de 2008): 1974–81. http://dx.doi.org/10.1016/j.renene.2007.12.008.

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48

Ishkhanyan, M. V. "Modeling of Dynamics of Land Boat Based on the Magnus Effect". Mekhatronika, Avtomatizatsiya, Upravlenie 20, n.º 4 (10 de abril de 2019): 230–35. http://dx.doi.org/10.17587/mau.20.230-235.

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The motion of a wind powered land boat is studied. It is supposed that the land boat moves along a straight line in a steady horizontal wind flow. The axis of rotation of the Savonius rotor is vertical. The rotation of the Savonius rotors induces the Magnus force that maintains the motion of the load boat. Such vehicles can be used to perform transportation in large open areas, where there is an access to free wind. In this paper, the mathematical model of the land boat driven by the Savonius rotor is constructed. The quasi-steady approach is used to describe the aerodynamic action upon the system. Corresponding aerodynamic coefficients are approximated basing on experimental data. The angle between the wind velocity and the velocity of the boat is a varied parameter of the model. The equations of the model are presented as a dynamic system of the second order. The conditions of existence and stability of stationary modes of the dynamic system motion are obtained. It is described how the boat speed at steady motion depends upon the angle formed by the velocity of the boat and direction of the wind. In particular, it is shown that the maximum of the boat speed is achieved on the close-hauled course, that corresponds to the recommendations of the sail settings known in sea navigation.

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49

Mohan Kumar, Palanisamy, M. Mohan Ram Surya, Srikanth Narasimalu y Teik-Cheng Lim. "Experimental and numerical investigation of novel Savonius wind turbine". Wind Engineering 43, n.º 3 (6 de junio de 2018): 247–62. http://dx.doi.org/10.1177/0309524x18780392.

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Savonius wind turbines have distinct advantages in terms of simplicity, low noise, and ease of manufacturing, yet they are not preferred for large-scale power generation due to their lower aerodynamic performance and high wind loads. This study is aimed at reducing the thrust load with retractable type telescopic blades. This novel telescopic Savonius turbine is tested in an open jet wind tunnel to assess the performance in terms of torque, power, and thrust on the rotor. The dynamic and static characteristics are obtained for both extended and retracted configuration after correcting the experimental data for wind tunnel blockage. A preliminary numerical study is carried out in an effort to determine the variation of the drag coefficient in relation to the bucket thickness. The proposed telescopic turbine demonstrates a reduction in thrust load of 72.4% with a maximum power coefficient of 0.14 at the tip speed ratio of 0.7 compared to an extended operating configuration, similar to a conventional Savonius turbine. Thus, the telescopic Savonius turbine can be scaled up to higher kilowatt capacity with the cost comparable to other high-speed rotors such as Darrieus or horizontal axis wind turbines.

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Shishkin, Nikolai y Roman Ilyin. "Vortex vertical axis wind turbines for autonomous power supply". Energy Safety and Energy Economy 1 (febrero de 2022): 32–37. http://dx.doi.org/10.18635/2071-2219-2022-1-32-37.

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The paper gives an overview of vertical axis wind turbines. We have researched efficiency of a combined Darrieus and Savonius H-rotor with flaps having triangular parts. For the comparison, we consider vortex wind turbines with horizontal axis propeller rotors. It was proven that vertical axis wind turbines with combined rotors are more energy efficient based on experimentally found results. The proposed vortex wind turbines can be used for autonomous power supply, especially in remote areas.

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