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1
Sahim, Kaprawi, Kadafi Ihtisan, Dyos Santoso, and 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.
2
Song, Lei, Ji Wang, Shibo Wang, Zongxiao Yang, and Jianxin Su. "Numerical study on performance of a vertical axis wind rotor with S-shaped blades." PLOS One 20, no. 5 (May 27, 2025): e0322953. https://doi.org/10.1371/journal.pone.0322953.
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Traditional Savonius wind rotor has simple structure and can operate in any wind direction. However, its aerodynamic efficiency is lower than other types. A novel S-shaped wind rotor with three blades is proposed in order to improve the aerodynamic performance. The blade of the rotor is composed of two opposing convex circular arcs and its shape likes an ‘S’. The flow characteristics of the rotor are studied and analyzed by computational fluid dynamics (CFD) numerical simulation method. The steady and transient performances are studied using SST k-ω model and sliding mesh method, and are compared with that of traditional Savonius rotors. The results show that the average static torque coefficient of the rotor is 0.291, which is higher than the 0.222 of the Savonius rotor. The static vibration amplitude of the rotor is 0.375, which is lower than 0.709 of the Savonius rotor. The maximum power coefficient of the rotor is 0.228, which is also higher than the 0.226 of the Savonius rotor. The dynamic vibration amplitude of the novel rotor is 0.183, which is lower than the 0.492 of the Savonius rotor. The flow field analyses show that structure of the S-shaped blades can smooth the flow field and reduce the blocking effect in the overlap area. The study indicates that the proposed navel rotor can not only overcome the problems of sharp change in the internal flow field of traditional Savonius rotors, but also provide better operating stability and higher wind energy utilization.
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Cheng, Chao Yuan, and Xiao Qing Wei. "The Innovative Design and Simulation Analysis of Small Savonius Wind Turbine." Advanced Materials Research 591-593 (November 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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Moreno, Martin, Iván Trejo-Zúñiga, Jesús Terrazas, Arturo Díaz-Ponce, and Andrés Pérez-Terrazo. "Hybridization of a Micro-Scale Savonius Rotor Using a Helical Darrieus Rotor." Fluids 10, no. 3 (March 6, 2025): 63. https://doi.org/10.3390/fluids10030063.
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This study presents a micro-scale hybrid wind turbine that integrates a Savonius rotor with a Helical Darrieus rotor, aiming to enhance energy conversion efficiency and adaptability for decentralized renewable energy generation. The hybrid design leverages the high torque generation of the Savonius rotor and the aerodynamic efficiency of the Helical Darrieus rotor. Computational analyses using CFD simulations and experimental validation with a 3D-printed prototype in a closed wind tunnel were conducted at speeds ranging from 3 to 8 m/s. The results demonstrate that the hybrid turbine achieves a power coefficient of 0.26 at an optimal tip-speed ratio of 2.7, marking a 180% improvement over standalone Savonius rotors. The hybridization process mitigates the low-speed inefficiencies of the Savonius rotor. It compensates for the high-speed limitations of the Darrieus rotor, resulting in a turbine capable of operating efficiently over a wider range of wind speeds. This balanced integration maximizes energy harvesting and improves adaptability to varying wind conditions, achieving balanced and synergistic performance.
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Redchyts, Dmytro, Koldo Portal-Porras, Serhii Tarasov, Svitlana Moiseienko, Uliana Tuchyna, Natalya Starun, and Unai Fernandez-Gamiz. "Aerodynamic Performance of Vertical-Axis Wind Turbines." Journal of Marine Science and Engineering 11, no. 7 (July 5, 2023): 1367. http://dx.doi.org/10.3390/jmse11071367.
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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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Freitas, Felipe Augusto Lustosa Meireles, Ronaldo Barcelos e. Silva, Leonardo Da Rosa Schmidt, Silvana Maldaner, and Lucinéia Fabris. "Análise da potência mecânica de rotores de Savonius de mesma razão de aspecto." Ciência e Natura 42 (February 7, 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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Sampelawang, Petrus, Nasaruddin Salam, Luther Sule, and Rustan Tarakka. "Enhancing savonius rotor model with additional grooves on hydrokinetic turbine performance." Eastern-European Journal of Enterprise Technologies 1, no. 8 (127) (February 28, 2024): 28–37. http://dx.doi.org/10.15587/1729-4061.2024.298915.
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Hydrokinetic turbines use different rotors for technological and economic reasons. Even though it performs poorly, vertical-axis hydrokinetic turbines use the Savonius rotor. The object of research is a Savonius rotor model with additional grooves. The study addresses the need to improve the efficiency and overall performance of Savonius rotor models in hydrokinetic turbines, which are widely used for harnessing energy from flowing water currents. The problem involves understanding how different groove configurations affect the aerodynamic behavior and energy extraction efficiency of the Savonius rotor in hydrokinetic turbine applications. The test results revealed that incorporating grooves led to notable improvements in efficiency (ɳ) and coefficient of drag (CD). Grooved blades exhibited a maximum efficiency of 30.97 % and a maximum drag coefficient of 2.71. Notably, blades with a groove width of 12.5 mm emerged as the optimal model, demonstrating an efficiency peak of 35.66 % and a drag coefficient 3.08. This indicates a substantial increase in efficiency by 4.69 % and a corresponding rise in the drag coefficient by 0.37 for grooved blades. The grooves on grooved blades increase friction, improving performance. Grooved rotor blades improve turbine performance significantly. Savonius rotor models in hydrokinetic turbines extract more energy by optimizing groove width and arrangement to maximize drag coefficient and efficiency. This research affects hydrokinetic turbine design and optimization for renewable energy generation. Engineers and designers can improve the performance and efficiency of the Savonius rotor model in hydrokinetic turbine applications by applying this study’s findings
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Doerffer, Krzysztof, Janusz Telega, Piotr Doerffer, Paulina Hercel, and Andrzej Tomporowski. "Dependence of Power Characteristics on Savonius Rotor Segmentation." Energies 14, no. 10 (May 18, 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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Prabowoputra, Dandun Mahesa, Maria Krisnawati, Akhlis Rahman Sari Nurhidayat, Carolus Borromeus Krishna Sampurno, and Syamsul Hadi. "CFD-OPTIMIZED SAVONIUS WIND TURBINE PERFORMANCE DESIGN FOR PSA ANALYSIS." ASEAN Engineering Journal 15, no. 1 (February 28, 2025): 147–52. https://doi.org/10.11113/aej.v15.21368.
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The primary aim of this research is to enhance the accessibility of clean energy by advancing technology in energy conversion. Specifically, the focus is on optimizing the design of wind turbines equipped with Savonius rotors to maximize the generation of renewable energy. The Savonius rotor is a cross-flow rotor characterized by its uncomplicated design and ease of implementation. The performance of Savonius is significantly influenced by geometric considerations. The performance enhancement of the Savonius multi-stage is contingent upon the phase-shift angle (PSA). The present study employed three-dimensional modeling techniques with Ansys software, specifically utilizing the CFX solver. An optimization of the Savonius rotor design was conducted on a two-stage rotor, utilizing PSA variations of 0˚, 15˚, 30˚, 45˚, 60˚, 75˚ and 90˚. The technology employed in this study is computational fluid dynamics (CFD), which is performed assuming steady-state boundary conditions. The turbulent behavior of fluid flow is effectively captured by the SST turbulence model. The velocity of the fluid entrance is established at 6 m/s, while the pressure of the output is consistently maintained at 1 atm. The Savonius rotor variant, including a pitch angle angle (PSA) of 15°, demonstrates a coefficient of power of 0.32, which is widely regarded as the most ideal. The performance of the two-stage Savonius design can be further evaluated by considering its performance at angles of 0° and 30°, as it exhibits commendable performance.
10
Song, Xiao Wen, Kai Yuan Cao, Zhong Rui Chen, and Ke Shen. "Design Optimization of Savonius Rotors: An Overview." Applied Mechanics and Materials 58-60 (June 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.
11
Saini, Gaurav, and Ashoke De. "ON THE SELF-STARTING COMPARATIVE PERFORMANCE EVALUATION OF DARRIEUS AND HYBRID HYDROKINETIC ROTOR." International Journal of Energy for a Clean Environment 24, no. 5 (2023): 67–91. http://dx.doi.org/10.1615/interjenercleanenv.v24.i5.50.
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Darrieus rotor is a promising technology for hydrokinetic and wind energy harvesting applications. However, the Darrieus rotor suffers from the problem of poor starting performance. The present research highlights solutions to improve the poor starting performance of the Darrieus rotor by introducing the hybrid rotor. Further, a comparative performance evaluation of conventional vertical axis Darrieus and hybrid rotors has been investigated numerically. The most widely used S-series S-1046 hydrofoil has been utilized by hybrid and Darrieus rotors. Further, two semicircular blades are used for the Savonius part of the hybrid rotor. The size of the Savonius part is optimized to obtain maximum performance from the hybrid rotor. Analyzing the flow field distributions across the turbine vicinity has highlighted various possible reasons. The study results have demonstrated that the hybrid rotor yields an exceptional increment of about 159.41% in the torque coefficient under low tip speed ratio (TSR) regimes (during initial starting) compared to the Darrieus rotor. However, due to the Savonius rotor's presence, the hybrid rotor's maximum power coefficient is reduced slightly compared to the maximum operating point of the Darrieus rotor. Further, the hybrid rotor yields a wider operating range than the single maximum operating point by the Darrieus rotor. The present investigations will assist the designers in selecting the site-specific hydrokinetic technology suitable for efficient and optimum use of hydrokinetic potential.
12
Etemadeasl, Vahid, Rasool Esmaelnajad, Farzad F. Dizaji, and 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, no. 6 (December 17, 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%.
13
Gupta, Rajat, Bachu Deb, and R. D. Misra. "Performance Analysis of a Helical Savonius Rotor with Shaft at 45° Twist Angle Using CFD." Mechanical Engineering Research 3, no. 1 (March 1, 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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Tang, Zhi Peng, Ying Xue Yao, Liang Zhou, and Q. Yao. "Optimal Design of a New Type of Savonius Rotor Using Simulation Analysis." Key Engineering Materials 499 (January 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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Shishkin, Nikolai, and 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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Sineglazov, Victor, and Oleksandr Stanislavchuk. "Automation Disign of Hybrid Vertical-axial Rotors." Electronics and Control Systems 4, no. 70 (April 1, 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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Ghafoorian, Farzad, Sina Hosseini Rad, and Mahdi Moghimi. "Enhancing Self-Starting Capability and Efficiency of Hybrid Darrieus–Savonius Vertical Axis Wind Turbines with a Dual-Shaft Configuration." Machines 13, no. 2 (January 23, 2025): 87. https://doi.org/10.3390/machines13020087.
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Self-starting capability has consistently presented a significant challenge for Darrieus vertical axis wind turbines (VAWTs). One advantageous approach to addressing this problem is the design of a hybrid Darrieus–Savonius VAWT. The hybrid VAWT enhances self-starting capability by increasing the power coefficient (Cp) within the low tip speed ratio (TSR) range and the torque coefficient (Cm) at initial azimuth angles, when the blades transition from windward to upwind position. A significant challenge associated with conventional hybrid VAWTs, in which both rotors are mounted on a single shaft, is the decline in efficiency at the high-TSR range. This inefficiency is due to the performance limitations of the inner Savonius rotor, which is designed to function at low angular velocities. In the high-TSR range, the vorticity generation around Savonius rotor buckets adversely impacts the Darrieus rotor performance and the hybrid VAWT. A dual-shaft configuration is proposed to mitigate this issue, which utilizes a drivetrain transmission system to prevent the Savonius rotor from exceeding its optimal angular velocity, thus acting as a control mechanism. The findings indicate that implementing the dual-shaft rotor resulted in a 35% improvement in Cp within the low-TSR range and a 25% enhancement in the high-TSR range. This improvement is achieved when the inner rotor’s angular velocity is maintained at 19.79 rad/s, which has been determined to be the optimal value for the inner rotor.
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Riady, Muhammad Ihsan, Dyos Santoso, Bazlina Dawami Afrah, Juliet Patricia Arsadha, Rupinder Rupinder, and Miftahurrizka Afrah. "Studi eksperimental turbin angin kombinasi sumbu vertikal darrieus-savonius dengan poros kembar." Jurnal Teknik Kimia 28, no. 1 (March 1, 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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Golecha, K., M. A. Kamoji, S. B. Kedare, and S. V. Prabhu. "Review on Savonius Rotor for Harnessing Wind Energy." Wind Engineering 36, no. 6 (December 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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Sahim, Kaprawi, Dyos Santoso, and 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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Adhikary, Anik, Md Quamrul Islam, and Mohammad Ali. "PERFORMANCE OF A STATIONARY SAVONIUS ROTOR WITH CIRCULAR ARC BLADE PROFILE." Journal of Mechanical Engineering 43, no. 2 (February 1, 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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Zhang, Hongfu, Zhiqiang Li, Dabo Xin, and Jian Zhan. "Improvement of Aerodynamic Performance of Savonius Wind Rotor Using Straight-Arc Curtain." Applied Sciences 10, no. 20 (October 16, 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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Amin, Muhammad Zainal Roisul, and Bambang Sri Kaloko. "Sistem Kontrol Sudut Blade Turbin Savonius dengan Metode Regresi Linier Berganda untuk Optimasi Pembangkit Listrik Tenaga Angin." Techné : Jurnal Ilmiah Elektroteknika 23, no. 1 (April 20, 2024): 11–20. http://dx.doi.org/10.31358/techne.v23i1.378.
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Solusi paling ideal untuk mengatasi ketergantungan terhadap energi fosil adalah dengan mengembangkan energi terbarukan. Salah satu sumber energi terbarukan adalah tenaga angin. Energi angin merupakan energi bersih yang tidak akan mencemari lingkungan selama proses produksi. Turbin yang cocok untuk kecepatan angin rendah adalah turbin angin sumbu vertikal Savonius karena torsi awalnya yang tinggi. Turbin memiliki bentuk dan struktur yang sederhana, disusun menyerupai huruf S. Kecepatan angin yang tidak menentu inilah yang menyebabkan turbin angin vertikal dengan bentuk rotor Savonius S cocok dan efektif sebagai generator untuk output yang maksimal. Rotor Savonius S memiliki keunggulan dibandingkan Savonius U karena pada Savonius S lebih banyak angin yang mengenai rotor mengalir ke bilah rotor sehingga memberikan energi tambahan. Pada penelitian sebelumnya, prototipe kincir angin Savonius S dibuat dari bahan sederhana, tanpa mengendalikannya untuk menghasilkan daya yang optimal. Angin yang masuk dan mampu menggerakkan turbin masih berubah-ubah, sehingga perlu dikontrol agar kecepatan angin tetap konstan. Pengendalian ini bertujuan untuk menghasilkan nilai power yang optimal dengan sudut bukaan blade high pitch sesuai dengan power optimum yang diharapkan.
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Mochamad Bastomi. "UJI EKSPERIMENTAL PENGARUH RASIO LEBAR DAN TINGGI SUDU SAVONIUS TAMBAHAN PADA ROTOR TURBIN ANGIN SUMBU VERTIKAL DARRIEUS TERHADAP KEMAMPUAN SELF STARTING DAN JUMLAH PUTARAN TURBIN." Teknobiz : Jurnal Ilmiah Program Studi Magister Teknik Mesin 10, no. 2 (July 9, 2020): 43–48. http://dx.doi.org/10.35814/teknobiz.v10i2.1518.
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Belum tersedianya jaringan listrik di daerah pedalaman membuka peluang pemanfaatan energi angin sebagai sumber pembangkit listrik. Turbin Angin Sumbu Vertikal (TASV) Darrieus memiliki efisiensi tinggi sebagai pembangkit listrik tetapi tidak mampu self starting pada kecepatan angin rendah. Penelitian ini membahas tentang pengaruh rasio lebar dan tinggi sudu Savonius tambahan pada rotor TASV Darrieus troposkein terhadap kemampuan self starting dan jumlah putaran turbin. Metode yang digunakan adalah eksperimen dengan variasi desain sudu Savonius tambahan pada rasio lebar dan tinggi rotor 0.718, 0.738 dan 0.758, dan masing-masing memiliki luas penampang sapuan yang sama sebesar 0.04 m2 yang dipasang di bawah rotor TASV Darrieus simetrik troposkein yang memiliki luas penampang sapuan sebesar 0.04 m2 dan diuji pada kecepatan angin 2 m/s untuk memperoleh respon waktu self starting dan jumlah putaran turbin. Data pengujian dianalisa untuk diketahui pengaruh variasi rasio lebar dan tinggi rotor Savonius tambahan terhadap kemampuan self starting dan jumlah putaran turbin. Diperoleh hasil rasio antar lebar dan tinggi sudu rotor Savonius tambahan 0.738 mampu meningkatkan kemampuan self starting yang lebih baik dibanding 0.758 dan 0.718. Rasio antar lebar dan tinggi sudu rotor Savonius tambahan 0.758 mampu menghasilkan jumlah putaran turbin yang lebih baik dibanding 0.718 dan 0.738.
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Ahmad, Elsadic Salim. "A Study of the Influence of Guide Vane Design to Increase Savonius Wind Turbine Performance." Modern Applied Science 9, no. 11 (September 30, 2015): 222. http://dx.doi.org/10.5539/mas.v9n11p222.
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<p>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%.</p>
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Al-Ghriybah, Mohanad, Mohd Fadhli Zulkafli, Djamal Hissein Didane, and Sofian Mohd. "Performance of Double Blade Savonius Rotor at Low Rotational Speed." Journal of Computational and Theoretical Nanoscience 17, no. 2 (February 1, 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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Shaughnessy, B. M., and S. D. Probert. "Partially-blocked savonius rotor." Applied Energy 43, no. 4 (January 1992): 239–49. http://dx.doi.org/10.1016/0306-2619(92)90024-6.
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Harsanto, Tedy, Haryo Dwi Prananto, Esmar Budi, and Hadi Nasbey. "Design and Contruction of Vertical Axis Wind Turbine Triple-Stage Savonius Type as the Alternative Wind Power Plant." KnE Energy 2, no. 2 (December 1, 2015): 172. http://dx.doi.org/10.18502/ken.v2i2.373.
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<p>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. </p><p><strong>Keywords</strong>: Output power; savonius turbine; triple-stage; the structure of angle</p>
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Blanco, Javier, Juan de Dios Rodriguez, Antonio Couce, and 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, no. 13 (July 4, 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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Sineglazov, Victor, and Oleksandr Stanislavchuk. "Intelegence Design of Hybrid Vertical-axis Rotors." Electronics and Control Systems 4, no. 78 (December 27, 2023): 52–56. http://dx.doi.org/10.18372/1990-5548.78.18275.
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The work is devoted to the necessity of creating the vertical-axis rotors of wind power stations in the urban area, which can be placed on roofs and makes it possible to increase their energy productivity by 60-70%. It is shown that the locations of such rotors on roofs has its own characteristics, which consists in the need to take into account the shape of the topography of the house, its storey, the direction and speed of the winds above it, and others. Examples of implementation of wind farms are considered and it is proven that their energy efficiency can be increased due to the use of hybrid vertical-axis rotors, which consist of a combination of Darrieus and Savonius rotors, where the Darrieus rotor is the main source(s) of wind energy conversion into the electric one, while the Savonius rotor(s) provide the acceleration of the Darrieus rotors. For the implementation it has been used the genetic algorithm. An inelegance design system has been developed. An example of the application of this system for the design of a hybrid rotor is given.
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Ahmad, Muhammad, and Iram Rehman. "Investigating Aerodynamic Performance of Vertical Axis Wind Turbines Using Computational Techniques." Journal of Power Generation Technology 1, no. 1 (September 28, 2023): 20. https://doi.org/10.61369/jpgt.0568.
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Abstract: This paper presents a comprehensive&nbsp;aerodynamic analysis of H-Rotor Darrieus and&nbsp;Savonius turbines utilizing advanced computational&nbsp;fluid dynamics (CFD) techniques. H-Rotor Darrieus&nbsp;turbines, characterized by fixed blades, often&nbsp;encounter challenges with self-starting, while Savonius&nbsp;turbines exhibit good starting capabilities albeit with&nbsp;lower power coefficients (Cp). In this study, the sliding&nbsp;mesh technique was employed to investigate the&nbsp;intricate flow fields over the airfoil geometry, H-Rotor&nbsp;Darrieus turbine, and Savonius turbine. The analysis&nbsp;revealed that Savonius turbine starts generating&nbsp;power at a low wind speed of 2 m/s, while the H-Rotor&nbsp;Darrieus requires a slightly higher wind speed of 3.1&nbsp;m/s to begin operation. Moreover, the maximum rated&nbsp;power of the H-Rotor Darrieus turbine was found to&nbsp;be 30 watts, which was significantly higher than the&nbsp;Savonius turbine&rsquo;s maximum rated power of 5 watts.&nbsp;The Cp for H-Rotor Darrieus and Savonius turbines&nbsp;were meticulously determined across a range of tip&nbsp;speed ratios (TSRs), with remarkable peak values&nbsp;of 0.32 and 0.21 achieved at TSRs of 1.69 and 0.75, respectively. The comparison of CFD results with&nbsp;experimental data revealed that the H-Rotor Darrieus&nbsp;configuration consistently outperformed its Savonius&nbsp;counterpart, particularly in high wind speed conditions.&nbsp;The results showed that the maximum absolute&nbsp;difference between the experimental and CFD values&nbsp;is 1.3 watts for the Savonius turbine and 4.5 watts for&nbsp;the H-Rotor Darrieus turbine. These small absolute&nbsp;differences indicate the accuracy and reliability of&nbsp;the simulations. By offering valuable insights into the&nbsp;design configurations, this present study establishes&nbsp;a foundation for achieving superior performance and&nbsp;efficiency in vertical axis wind turbine (VAWT). The&nbsp;high-fidelity analysis provided through CFD simulations&nbsp;proves instrumental in the early design phase, enabling&nbsp;engineers to make informed decisions and refine their&nbsp;designs with greater confidence.
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Ogawa, T., H. Yoshida, and Y. Yokota. "Development of Rotational Speed Control Systems for a Savonius-Type Wind Turbine." Journal of Fluids Engineering 111, no. 1 (March 1, 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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Lajnef, Mariem, Mabrouk Mosbahi, Mouna Derbel, Zied Driss, Antonio Pantano, Tullio Tucciarelli, Marco Sinagra, and Calogero Picone. "Performance Investigation of a Twisted Savonius Wind Rotor." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 128, no. 1 (March 10, 2025): 1–18. https://doi.org/10.37934/arfmts.128.1.118.
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For human welfare, electrical power is necessary. For many years, there has been a great deal of interest in wind energy because it is a clean, sustainable energy source. Because of its cheaper cost and independence from wind direction, the Savonius vertical axis wind rotor has the advantage of being suitable for certain implementations as an energy converter. Several studies have been carried out to increase its efficiency. In this paper, a novel blade design of a twisted Savonius wind rotor has been investigated numerically with the intention of performance betterment. Three-dimensional unsteady simulations were performed deploying Ansys Fluent using the Shear Stress Transport k-ω turbulence model based on the finite volume method solver. The wind flow aerodynamic characteristics in addition to the rotor performance properties were acquired and analyzed. The numerical model was validated based on findings taken from experimental tests performed on a 3-D printed twisted rotor in a wind tunnel. An improvement in the power coefficient by 22.58 % was recorded with the novel blade design over the twisted Savonius wind rotor. The obtained findings could provide further direction for researchers to use the twisted Savonius wind turbine in power generation.
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Abdel-razak, Mahmoud H., Mohamed Emam, Shinichi Ookawara, and Hamdy Hassan. "Optimization of the power performance for three hybrid Darrieus-Savonius rotors based on the Taguchi method." Journal of Physics: Conference Series 2857, no. 1 (October 1, 2024): 012011. http://dx.doi.org/10.1088/1742-6596/2857/1/012011.
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Abstract The hybrid vertical-axis wind turbine is a unique design that overcomes the efficiency limitations of Savonius rotors and the start-up challenges of Darrieus rotors. This study uses the Taguchi optimization method to enhance the performance of a cluster of three hybrid Darrieus-Savonius vertical-axis wind turbines. The optimized parameters include distances between adjacent turbine centers, configuration angles, rotational directions, and the pitch angle. The study is the first to investigate the effect of varying the pitch angle of Darrieus airfoil blades on hybrid design performance. The optimal configuration of the three hybrid VAWTs and the isolated rotor is analyzed through flow velocity, pressure, and turbulence kinetic energy contours. The results show that the pitch angles have the greatest effect on the rated power coefficient among other studied influencing parameters. The optimal cluster configuration’s performance improvement is due to the favorable velocity gradient around the blades. Compared to the isolated rotor, the power coefficient enhancement for the optimal case is 46.545% at the rated tip speed ratio of 3.08. The hybrid rotor in the cluster can achieve almost the same power as the isolated rotor up to a tip speed ratio of 4.1 instead of 2.86 for the isolated rotor. However, the decrease in overall efficiency for some cluster configurations is due to wake flow intensity and trapping between the rotors, which causes a stagnation zone.
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Mohan Kumar, Palanisamy, Mohan Ram Surya, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. "Computational Optimization of Adaptive Hybrid Darrieus Turbine: Part 1." Fluids 4, no. 2 (May 17, 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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Mohd Halmy, Muhammad Syahmy, Djamal Hissein Didane, Lukmon Owolabi Afolabi, and 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, no. 4 (April 17, 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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Li, Yan, Jun Rui Chai, Fa Ning Dang, Fang Feng, and Wen Qiang Tian. "Numerical Simulation on Static Performance of Savonius Rotor Based on Different Turbulence Models." Advanced Materials Research 488-489 (March 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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Varia, Manthan N. "Aerodynamic Analysis of Novel Savonius Rotor." International Journal for Research in Applied Science and Engineering Technology 9, no. 11 (November 30, 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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Sahim, Kaprawi, Dyos Santoso, and 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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Wong, K. H., J. S. Y. Foo, W. T. Chong, S. Mat, and J. H. Ng. "Experimental investigation into the effects of endplate designs for a Savonius turbine." IOP Conference Series: Earth and Environmental Science 1372, no. 1 (July 1, 2024): 012010. http://dx.doi.org/10.1088/1755-1315/1372/1/012010.
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Abstract Wind energy is experiencing a trend of exponential growth in both literature and industrial employment, emphasizing its current pivotal role in achieving carbon neutrality by replacing fossil fuels. Vertical axis wind turbines (VAWTs) particularly Savonius rotors operate at a lower tip-speed-ratio (TSR) range compared to horizontal axis wind turbines (HAWTs). The Savonius rotor has good starting characteristics, making it suitable to be placed in urban areas with lower wind speeds. Due to its low efficiency, studies on augmentation and optimization have been conducted to improve its blade and deflector designs. Extensive research has established a common consensus that the use of endplates significantly improves the aerodynamic performance of the Savonius rotor. However, limited research has been undertaken to explore the endplate design further. In this study, wind tunnel tests were conducted on different endplate ratios, to investigate the effects of endplate design on the aerodynamic performance of a conventional Savonius turbine. Three different Savonius rotor with no endplate, semi-circular endplate and circular endplate were designed and manufactured. Experiments were conducted in an open-type suction wind tunnel at a constant measured wind velocity of 5.89 m/s. The turbine’s performance for different endplate ratios was evaluated across a TSR range of 0.2 to 1.0. The performance was assessed based on the maximum power generated and its self-starting ability. From the experimental results, the circular endplate ratio of 1.1 shows a significantly high coefficient of power compared to both semi-circular and without endplates. This is due to reduced spanwise spillage and enhanced airflow capture by the rotor. The endplates direct incoming air to the advancing blade and overlap region, resulting in the increased pressure difference between the concave and convex sides of both the advancing and returning blade, thereby improving the power efficiency of the turbine with 1.1D diameter endplate and semi-circular endplate by 296.6% and 6.9% compared to no endplates case.
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Rajkumar, M. Jaya, and U. K. Saha. "Valve-Aided Twisted Savonius Rotor." Wind Engineering 30, no. 3 (May 2006): 243–54. http://dx.doi.org/10.1260/030952406778606269.
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Brusca, S., A. Galvagno, R. Lanzafame, S. Mauro, and M. Messina. "How to Increase Savonius Power Coefficient: Ducted Rotor Performance with Different Overlap Ratios." Journal of Physics: Conference Series 2385, no. 1 (December 1, 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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Guseva, Yu V., S. A. Kostryukov, and A. R. Vasilev. "Laboratory model of the Savonius rotor." Power engineering: research, equipment, technology 24, no. 3 (June 14, 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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Sumiati, Ruzita, Uyung Gatot S. Dinata, Dendi Adi Saputra Saputra, and Yusuf Dewantoro Herlambang. "Enhancing Savonius Rotor Performance with Zigzag in Concave Surface-CFD Investigation." CFD Letters 17, no. 2 (September 30, 2024): 100–114. http://dx.doi.org/10.37934/cfdl.17.2.100114.
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Savonius, a type of vertical-axis wind turbine (VAWT), is suitable as an appropriate small-scale energy conversion apparatus for regions with relatively low wind speeds, such as Indonesia; however, it exhibits sub-optimal efficiency. One potential approach to improving the efficiency of Savonius turbines is to increase the drag force on the concave surface of the blades. In this case, the dissimilarity in the forces experienced by the two blades can be increased, resulting in a corresponding increase in torque. This investigation aims to assess and compare the power coefficient (Cp), torque and drag coefficient (Cd) of the conventional Savonius rotor with the zigzag pattern implemented in the middle area of the concave surface of the blades at low wind speeds. The efficiency can be achieved by implementing the k-ω shear stress transfer (SST) turbulent model and 3D computational fluid dynamics simulation at tip speed ratio (λ) 0.4-1 with a velocity inlet of 4, 5, and 6 m/s. The study results show that using the zigzag pattern on the concave surface led to an 18.8% boosted in Cp of at λ = 0.8 and an inlet velocity (U) = 5 m/s compared to the standard Savonius rotor model. In this case, the efficiency of the Savonius wind turbine may be enhanced by incorporating a zigzag pattern in the middle of the concave surface of the Savonius rotor.
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Mercado-Colmenero, Jorge Manuel, Miguel Angel Rubio-Paramio, Francisca Guerrero-Villar, and Cristina Martín-Doñate. "A numerical and experimental study of a new Savonius wind rotor adaptation based on product design requirements." Energy Conversion and Management 158 (January 9, 2018): 210–34. https://doi.org/10.1016/j.enconman.2017.12.058.
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The researching consist on presenting the numerical-experimental study carried out on a new rotor adapted from a Savonius rotor. Aesthetic, ergonomic and functional requirements have been incorporated into it in order to be part of sustainable consumer products. The new rotor consists of a parametric model adaptable to the dimensions and geometry of the products which it will be part of. A set of translation, symmetry, rotation and scaling operations have been applied to the bucket sections of the Savonius rotor by means of transforming the initial cylindrical buckets into topological surfaces with an organic shape. The new modified Savonius rotor and the conventional Savonius with the same Aspect Ratio have been tested in an open jet wind tunnel in order to verify the influence level of product design parameters on rotor performance, in terms of power coefficient, torque coefficient and mechanical power generated. Experimental tests have been carried out for Reynolds values in the range of [3,430·10<sup>4</sup> and 1,419·10<sup>5</sup>]. A numerical analysis using an incompressible unsteady Reynolds average Navier Stockes model has been validated by means of the experimental results. Experimental and numerical results coincide with a 3.5% error. The behavior of the turbine has been analyzed by varying the angle of rotation for the sections of its buckets. Using a rotation angle of 45 ° the power coefficient values improves by 32% compared to the values obtained using an angle of 0 °. The rotor has been dimensioned for its application in a patented consumer product of small dimensions and requirements of lateral accessibility to its interior. Under these limited conditions the rotor meets the small-scale energy requirements of the product. The new rotor is designed as an aid to the energy consumption of the product in which it is incorporated, maintaining the advantages of a conventional Savonius rotor as self-starting, easy manufacture and maintenance, obtaining at the same time a product that sells better, is more able to integrate into its environment and is customizable for the consumer.
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Alhakiem, Faris Zaiem, Mietra Anggara, and 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, no. 1 (January 5, 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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Eftekhari, Hesam, Abdulkareem Sh Mahdi Al-Obaidi, and Sucharita Srirangam. "Numerical Investigation of Hybrid Savonius-Darrieus Vertical Axis Wind Turbine at Low Wind Speeds." Journal of Physics: Conference Series 2523, no. 1 (July 1, 2023): 012032. http://dx.doi.org/10.1088/1742-6596/2523/1/012032.
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Abstract The need for electricity on the Earth is increasing day by day, and this requires building more electric power plants where most of the power plants cause CO2 emission which would increase the global warming. Using wind energy as one type of renewable energies, would contribute to reduce the global warming. In countries such as Malaysia where the average annual wind speed is 2-2.5 m/s using wind energy is a challenge because of the low wind speed. However, using a hybrid Savonius-Darrieus vertical axis wind turbine in low wind speed areas, the performance of the wind turbine may increase, and the starting rotation speed will decrease. This research aims at a comprehensive study on a hybrid Savonius-Darrieus wind turbine with helical Savonius rotor combined with helical and straight bladed Darrieus rotor. In this research, a base model with the name of Model Base was generated and two models with new configurations were generated in SOLIDWORKS. A numerical studies and simulation were conducted on these three designs using Ansys Fluent to identify the more suitable combination for low wind speed areas. Based on the obtained result hybrid Savonius-Darrieus with helical Savonius rotor and helical Darrieus rotor were found to be the most suitable combination because of their stable aerodynamic performance throughout a full rotation. Best performance for these models was found to be at 0.45 TRS with maximum torque and power coefficients of 0.68 and 0.306 respectively.
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Suprayogi, Dedy Triawan, Hadi Setiawan, Alwan Habibie, Muhammad Adjie, and Faqih Atard Rahman. "Development of Savonius Rotor Based on Bezier Curve for Vertical Axis Marine Current Turbine at Sunda Strait, Hindia Ocean." Engineering Innovations 11 (June 26, 2024): 69–74. http://dx.doi.org/10.4028/p-tvv8pq.
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Due to its strategic location and ocean currents, the Sunda Strait has the potential to produce energy that might be used as a source of electricity. As a result, this strait area urgently needs a suitable turbine design. This strait's most significant sea current speed is 1 (one) m/s. The Savonius rotor is one of the rotor kinds of turbines that can operate in the slow sea current—modifying the rotor from semi-circular to use the Bezier curve for the shape to optimize the performance. This paper will discuss the design of the Savonius rotor using the Bezier curve, that have improved performance. The rotor with double stacking will also enhance the performance of the rotor. This design is a novelty for vertical marine current turbine applications in ocean renewable energy.
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Samiran, N. Afzanizam, A. A. Wahab, Mohd Sofian, and N. Rosly. "Simulation Study on the Performance of Vertical Axis Wind Turbine." Applied Mechanics and Materials 465-466 (December 2013): 270–74. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.270.
Full textAbstract:
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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Irawan, Elysa Nensy, Sandro Sitompul, Ken-Ichiro Yamashita, and 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, no. 01 (January 2, 2023): 1–12. http://dx.doi.org/10.21926/jept.2301001.
Full textAbstract:
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.