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1
Mrigua, Khalid, Mounia Zemamou i Mohammed Aggour. "Numerical Investigation of a New Modified Savonius Wind Turbines". International Journal of Renewable Energy Development 11, nr 4 (7.08.2022): 1113–23. http://dx.doi.org/10.14710/ijred.2022.45799.
Pełny tekst źródłaStreszczenie:
The classic Savonius semi-circular blade turbine has a relatively low power coefficient.The performance of a Savonius wind turbine depends on its geometrical parameters. Various blade profiles have been developed in the past years to improve the performance of this class of turbine. In this paper, a new blade shapes of Savonius wind turbine is investigated numerically by using the CFD method , by using transient conditions and set k omega turbulence model.The new blade has different concave and convex shape, which is a combination of the conventional and the elliptical blade. A comparative study of three blade profiles, semi-circular, elliptical and the composed blades have been performed.Flow structures around the rotor have also been analyzed. The results show that changing the blade shape has an effect on the performance efficiency of the Savonius turbine.The new modified and the elliptical blade exhibit higher performance compared to the conventional Savonius wind turbine. The new modified Savonius blade and the elliptical blade exhibit an improved performance compared to the conventional model in the order of 20.5% and 18.2% respectively at the tip speed ratio of 0.8.
2
Damota, Javier Blanco, Juan de Dios Rodríguez García, Antonio Couce Casanova, Javier Telmo Miranda, Claudio Giovanni Caccia i María Isabel Lamas Galdo. "Analysis of a Nature-Inspired Shape for a Vertical Axis Wind Turbine". Applied Sciences 12, nr 14 (12.07.2022): 7018. http://dx.doi.org/10.3390/app12147018.
Pełny tekst źródłaStreszczenie:
Wind energy is gaining special interest worldwide due to the necessity of reducing pollutant emissions and employ renewable resources. Traditionally, horizontal axis wind turbines have been employed but certain situations require vertical axis wind turbines. With a view to improve the efficiency of a vertical axis wind turbine Savonius type, the present work proposes a bioinspired design blade profile relying on the Fibonacci spiral. This shape is repeatedly presented in nature and thus it leads to a bio-inspired blade profile. A numerical model was carried out and it was found that the Fibonacci shape improves the performance of the original Savonius shape, based on semicircular blade profiles. Particularly, the Fibonacci blade profile increases around 14% the power in comparison with the Savonius blade profile. Besides this comparison between Savonius and Fibonacci, a research study was carried out to improve the efficiency of the Fibonacci turbine. To this end, the effect of several parameters was analyzed: number of blades, aspect ratio, overlap, separation gap, and twist angle. Improvements on the average power greater than 30% were obtained.
3
Jamal, Jamal. "Pengaruh Jumlah Sudu Terhadap Kinerja Turbin Savonius". INTEK: Jurnal Penelitian 6, nr 1 (25.05.2019): 64. http://dx.doi.org/10.31963/intek.v6i1.1127.
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Savonius wind turbines are wind turbines that canoperate at low wind speeds, this type of turbine is very suitable tobe used in several places in Indonesia. The research aims toimprove the performance of the Savonius wind turbine withvariations in the number of turbine blades as well as variations inthe velocity of wind speed. The research method wasexperimental where wind turbine testing was carried out withvariations in the number of turbine blades with number of 2, 3and 4 blades, other variations carried out were wind speed at 3.5;4,5; 5.5 and 6.5 m/s. The study results show that the 2-bladeturbine produces greater rotation, but the torque moment islower than the 3 and 4 blade turbines, this can be seen in the lowefficiency of the 2 blade turbine at low wind speeds with highloading. At 3.5 m / s wind turbines 2 blade turbines haveefficiency that tends to be the same as 3 and 4 blade turbines upto 0.5 N but at loads of 0.6 - 1.2 N 2 blade turbines have lowerefficiency, while at wind speeds of 4.5 - 6.5 m / s 2 blade turbineshave greater efficiency than turbines 3 and 4 blades up to a loadof 1.2 N but if the load is added then the efficiency of 2-bladeturbines can be smaller than efficiency 3 and 4-blade.
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Rosyid, Ahmad Lazim, Ikhwanul Qiram i Dewi Sartika. "Pengaruh Jumlah dan Rasio Sudut Lengkung Sudu Terhadap Unjuk Kerja Turbin Angin Savonius Heliks". V-MAC (Virtual of Mechanical Engineering Article) 5, nr 2 (17.11.2020): 17–20. http://dx.doi.org/10.36526/v-mac.v5i2.1038.
Pełny tekst źródłaStreszczenie:
The helical Savonius is a vertical wind turbine that can utilize wind energy to become a renewable energy source. This study aims to determine the effect of the number of blades and the ratio of blade bends on the performance of the Savonius helical wind turbine. The research was conducted through experimentation using variations in the number of blades 2 and 3 blades. Variation of blade bending ratio H / L = 6/10, 7/10 and 8/10 and variations in wind speed (4.0), (5.2), (6.4) and (7.4) m / s. The turbine performance analysis is reviewed based on the shaft rotation (RPM) of the turbine and the output voltage (volts) generated by the generator connected to the turbine shaft. The results showed that the wind speed, the number of blades, and the blending ratio of the blades affect the performance of the Savonius helical wind turbine. The results of the maximum wind turbine performance test at a variation of 3 blades, a ratio of 6/10, and a wind speed of 7.4 m / s, produce a shaft rotation value of 472.9 rpm and a generator output voltage value of 5.51 volts.
Keywords: Helical Savonius, number and ratio blade bend, wind speed, performance
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Purwoko, Purwoko. "PENGARUH JUMLAH DAN SUDUT PEMASANGAN SUDU TERHADAP DAYA TURBIN SAVONIUS". INFO-TEKNIK 21, nr 2 (25.01.2021): 125. http://dx.doi.org/10.20527/infotek.v21i2.10036.
Pełny tekst źródłaStreszczenie:
The problem in Energy conservation is finding new opportunities for high-efficiency energy generation including wind power generating machines. Aims of this study to determine the effects of blade number and curv angle of blade mounting on the output power of a Savonius type wind turbine. This low speed wind turbine is intended to get energy at the top of a multi-storey building in an urban area. Tests were carried out on a laboratory scale, using savonius wind turbines with 400 mm diameter and 500 mm height. The driving wind speed of the turbine is set between 1.5 to 8.5 m / s. While the number of blades used is 2 types, namely rotor with three blades and rotor with 4 blades, each of which is tested on 3 different types of curv angle blade.
The investigation results are expected to show that the wind tubing from each experiment will give different characteristics. This investigation results that there was increasing in efficiency in the savonius turbine with blades. The highest rotation and power occur when the turbine uses 2 blades and -50 curv angle of blade mounting
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Yudistira, Raditya, Dwi Anung Nindito i Raden Haryo Saputra. "Uji Eksperimental Pengembangan Turbin Hidrokinetik Savonius Berdasarkan Bentuk Profil Distribusi Kecepatan Aliran". RekaRacana: Jurnal Teknil Sipil 7, nr 1 (21.07.2021): 1. http://dx.doi.org/10.26760/rekaracana.v7i1.215.
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ABSTRAKTurbin Tornado Savonius terinspirasi dari bentuk pola distribusi kecepatan yang kecil pada bagian bawah blade turbin kemudian membesar pada bagian atas blade turbin, yang bertujuan memperbesar area bidang tangkap aliran pada bagian atas turbin. Uji eksperimental dilakukan pada saluran prismatik dan membandingkan kinerja antara turbin hidrokinetik Savonius dan turbin Tornado Savonius. Berdasarkan hasil uji eksperimen, turbin Tornado Savonius memiliki performa optimum pada saat kedalaman air di saluran sama dengan tinggi turbin yang diuji coba. Bentuk blade turbin hidrokinetik Tornado Savonius mampu memperbesar area bidang tangkap aliran yang mengenai turbin, sesuai dengan bentuk distribusi kecepatan aliran untuk kondisi kedalaman yang sama dengan tinggi turbin.Kata kunci: savonius, hidrokinetik, tornado savonius, distribusi kecepatan aliran. ABSTRACKTornado Savonius turbine inspired by velocity distribution pattern shape which small at the bottom and getting bigger the upper part of turbine blade. Such shape aims to enlarge the flow catchment area at the turbine’s upper part. Experimental test performed in prismatic channel by comparing the performance of Savonius hydrokinetic turbine and Tornado Savonius turbine. Based on the result of experimental test, Tornado Savonius turbine has optimum performance at the time of water depth in channel equal to height of the examined turbine. Blade shape of Tornado Savonius hydrokinetic turbine is able to enlarge the flow catchment area in accordance with flow speed distribution shape at the same depth as turbine height.Keywords: savonius, hydrokinetic, tornado savonius, flow velocity distribution.
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Saowalak Thongdee, Churat Tararuk, Natthawud Dussadee, Rameshprabu Ramaraj i Tanate Chaichana. "Study on performance of a savonius wind turbines related with the blade angle". Maejo International Journal of Energy and Environmental Communication 1, nr 2 (9.08.2019): 32–36. http://dx.doi.org/10.54279/mijeec.v1i2.244916.
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This research aimed to compare the performance of Savonius vertical axis wind turbines through blade numbers and different blade angles. In this study, applicable turbines having 4, 6, 8, 12, 16 and 18 numbers of blades with the angles of the blades of -15°, -5°, 0°, 5° and 15°, respectively. The rotor used was a semicircle shaped blade made from PVC material and has a blade diameter of 6 cm and 30 cm for both rotor diameter and height. The turbine was tested deadweight range of 0-0.49 kg at 4 m/s wind speed. The results showed that the blade angle has a positive effect on increasing the power and torque coefficient of Savonius wind turbine, specifically on blades less than 16. The highest power and torque coefficient was obtained from the turbine having16 blades at an angle of 5°. This configuration also found that the maximum power and torque coefficient in the tip speed ratio ranging from 0.3-0.4 are 0.2519 and 0.5858, respectively.
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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, nr 1 (29.07.2021): 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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Purwoko, Santoso i Nurchajat. "PENGARUH JUMLAH DAN SUDUT PEMASANGAN SUDU TERHADAP DAYA TURBIN ANGIN SAVONIUS". Jurnal Teknik Ilmu Dan Aplikasi 9, nr 2 (28.04.2021): 17–21. http://dx.doi.org/10.33795/jtia.v9i2.27.
Pełny tekst źródłaStreszczenie:
The problem in Energy conservation is finding new opportunities for high-efficiency energy generation including wind power generating machines. This study aims to determine the effect of the number and curv angle of blade mounting on the output power of a Savonius type wind turbine. This low speed wind turbine is intended to get energy at the top of a multi-storey building in an urban area. Tests were carried out on a laboratory scale, using savonius wind turbines with a diameter of 400 mm and a height of 500 mm. The driving wind speed of the turbine is set between 1.5 to 8.5 m / s. While the number of blades used is 2 types, namely rotor with three blades and rotor with 4 blades, each of which is tested on 3 different types of curv angle blade. The investigation results are expected to show that the wind tubing from each experiment will give different characteristics. The results showed that there was an increase in efficiency in the savonius turbine with blades. The highest rotation and power occur when the turbine uses 2 blades and -50 curv angle of blade mounting
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Al-Gburi, Kumail Abdulkareem Hadi, Firas Basim Ismail Alnaimi, Balasem Abdulameer Jabbar Al-quraishi, Ee Sann Tan i Ali Kamil Kareem. "Enhancing Savonius Vertical Axis Wind Turbine Performance: A Comprehensive Approach with Numerical Analysis and Experimental Investigations". Energies 16, nr 10 (19.05.2023): 4204. http://dx.doi.org/10.3390/en16104204.
Pełny tekst źródłaStreszczenie:
Small-scale vertical-axis wind power generation technologies such as Savonius wind turbines are gaining popularity in suburban and urban settings. Although vertical-axis wind turbines (VAWTs) may not be as efficient as their horizontal-axis counterparts, they often present better opportunities for integration within building structures. The main issue stems from the suboptimal aerodynamic design of Savonius turbine blades, resulting in lower efficiency and power output. To address this, modern turbine designs focus on optimizing various geometric aspects of the turbine to improve aerodynamic performance, efficiency, and overall effectiveness. This study developed a unique optimization method, incorporating a new blade geometry with guide gap flow for Savonius wind turbine blade design. The aerodynamic characteristics of the Savonius wind turbine blade were extensively analyzed using 3D ANSYS CFX software. The optimization process emphasized the power coefficient as the objective function while considering blade profiles, overlap ratio, and blade number as crucial design parameters. This objective was accomplished using the design of experiments (DOE) method with the Minitab statistical software. The research findings revealed that the novel turbine design “OR0.109BS2BN2” outperformed the reference turbine with a 22.8% higher power coefficient. Furthermore, the results indicated a trade-off between the flow (swirling flow) through the gap guide flow and the impact blockage ratio, which resulted from the reduced channel width caused by the extended blade tip length.
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Puspitasari, Dewi, i Kaprawi Sahim. "Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine". Journal of Mechanical Engineering and Sciences 13, nr 4 (30.12.2019): 5832–47. http://dx.doi.org/10.15282/jmes.13.4.2019.09.0465.
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A vertical hybrid turbine commonly consists of a Darrieus and Savonius rotor where the Savonius is inside Darrieus turbine. This paper describes the experimental study of hybrid Darrieus-Savonius wind turbines by variation in Savonius blade height. In this case, the effect of the blade height of the Savonius blade was studied experimentally in a subsonic wind tunnel. The effect of the height of a Savonius blade relative to that of Darrieus called blade height ratios δ was investigated to know the hybrid turbine performance. The performance is represented by power and torque coefficient. The result shows that the hybrid turbine with height ratio greater than unity δ = 1.4 gives the highest power CP = 0.20 and torque coefficient CT = 0.129. It is investigated that the torque and the power coefficient have a higher value than that of Darrieus turbine, in which the increase in power and torque coefficient are 48% and 29%, respectively. This hybrid wind turbine with a blade height ratio greater than unity can be considered as an important variable in the wind turbine construction.
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Mu, Zhongqiu, Guoqiang Tong, Zhenjun Xiao, Qingyue Deng, Fang Feng, Yan Li i Garrel Van Arne. "Study on Aerodynamic Characteristics of a Savonius Wind Turbine with a Modified Blade". Energies 15, nr 18 (12.09.2022): 6661. http://dx.doi.org/10.3390/en15186661.
Pełny tekst źródłaStreszczenie:
In order to improve the static start-up problem of Savonius wind turbines, a Savonius wind turbine with a modified blade is proposed. It was obtained by twisting the half-cylindrical blades of the basic Savonius wind turbine by 70°. The aerodynamic performance of the wind turbine before and after the modification was compared. Firstly, the static torque coefficient of two wind turbines at different azimuth angles were obtained by means of three-dimensional numerical simulation. The static flow field around the wind turbine was analyzed. Then, the output power and speed characteristics of a spiral Savonius wind turbine under different incoming wind speeds were evaluated in the wind tunnel. The results show that, compared with the Savonius wind turbine with half-cylindrical blades, the spiral wind turbine could start at any azimuths in one rotation cycle. The reverse torque was eliminated. The static torque coefficient fluctuation range was reduced by 10%. The start-up performance was effectively improved. This investigation could provide guidance for the improvement of start-up characteristics of Savonius wind turbines.
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Mohd Halmy, Muhammad Syahmy, Djamal Hissein Didane, Lukmon Owolabi Afolabi i 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, nr 4 (17.04.2021): 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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Sahim, Kaprawi, Kadafi Ihtisan, Dyos Santoso i 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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Sobczak, Krzysztof, Damian Obidowski, Piotr Reorowicz i Emil Marchewka. "Numerical Investigations of the Savonius Turbine with Deformable Blades". Energies 13, nr 14 (19.07.2020): 3717. http://dx.doi.org/10.3390/en13143717.
Pełny tekst źródłaStreszczenie:
Savonius wind turbines are characterized by various advantages such as simple design, independence of wind direction, and low noise emission, but they suffer from low efficiency. Numerous investigations were carried out to face this problem. In the present paper, a new idea of the Savonius turbine with a variable geometry of blades is proposed. Its blades, made of elastic material, were continuously deformed during the rotor revolution to increase a positive torque of the advancing blade and to decrease a negative torque of the returning blade. In order to assess the turbine aerodynamic performance, a two-dimensional numerical model was developed. The fluid-structure interaction (FSI) method was applied where blade deformations were defined by computational solid mechanics (CSM) simulations, whereas computational fluid dynamics (CFD) simulations allowed for transient flow prediction. The influence of the deformation magnitude and the position of maximally deformed blades with respect to the incoming wind direction were studied. The aerodynamic performance increased with an increase in the deformation magnitude. The power coefficient exceeded Cp = 0.30 for the eccentricity magnitude of 10% and reached 0.39 for the highest magnitude under study. It corresponded to 90% improvement in comparison to Cp = 0.21 in the case of the fixed-shape Savonius turbine.
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Awg. Osman, Dygku Asmanissa, Norzanah Rosmin, Nor Shahida Hasan, Baharruddin Ishak, Aede Hatib Mustaamal@Jamal i Mariyati Marzuki. "Savonius Wind Turbine Performances on Wind Concentrator". International Journal of Power Electronics and Drive Systems (IJPEDS) 8, nr 1 (1.03.2017): 376. http://dx.doi.org/10.11591/ijpeds.v8.i1.pp376-383.
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The air streams from the outlet of an air compressor can be used to generate electricity. For instance, if a micro-sized Vertical-Axis Wind-Turbine (VAWT) is installed towards the airflow, some amount of electricity can be generated before being stored in a battery bank. The research’s objectives are to design, fabricate and analyze the performance of Helical Savonius VAWT blade rotors, which is tested with and without using a wind concentrator. The Helical Savonius VAWT is tested at 0 cm without the concentrator, whereas the blade rotor is tested at concave-blade position when using the concentrator. The blade and the wind concentrator designs were based on the dimensions and the constant airflow of the air compressor. The findings suggested that the blade produced its best performance when tested using wind concentrator at concave-blade position in terms of angular speed (<em>ω</em>), tip speed ratio (<em>TSR</em>) and the generated electrical power (<em>P</em><em><sub>E</sub></em>). The findings concluded that the addition of wind concentrator increases the airflow which then provided better performances on the blades.
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Witono, Kris, Moh Nasir, Elka Faizal, Hangga Wicaksono i Bayu Pranoto. "Pengaruh Model Sudu Overlap dan Helix pada Proses Inisiasi Putaran Turbin Savonius". Otopro 15, nr 1 (2.12.2019): 27. http://dx.doi.org/10.26740/otopro.v15n1.p27-31.
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This research proposes a new model of overlap and helix blade shape. The overlap shape of the blades gives room to the air flow shortly after pounding the blades. Air flow direction is strived to be able to push the next blade so that the process of the turbine blade rotation becomes more effective. While the helix model is expected to produce a more efficient turbine rotation due to its multilevel shape. The wind speeds tested were 2 m / s, 4 m / s, and 6 m / s. Turbine speed rotation data retrieval is carried out at each additional time. The overlap blade has a greater angular velocity value of 9.4 rad / s at 2 m / s wind speed, 21.9 rad / s at 4 m / s wind speed, and 29.8 rad / s at 6 m / s wind speed.Turbines with multilevel helix blades have a higher level of stability compared to overlap blades. This is because there are two levels of turbine blades which have an angle difference of 600 which can receive more stable wind collisions. However, due to the smaller cross-sectional area of the helix blade turbine (ie 50% of the overlap blade) the effective impact area on the blade is also getting smaller. So that the energy that can be converted is also relatively smaller than the overlapping blade.
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Amiri, M., AR Teymourtash i M. Kahrom. "Experimental and numerical investigations on the aerodynamic performance of a pivoted Savonius wind turbine". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 231, nr 2 (4.11.2016): 87–101. http://dx.doi.org/10.1177/0957650916677428.
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Savonius turbines have been the subject of various wind energy projects due to their good starting characteristics, easy installation, and independency of wind direction. However, the Savonius rotor suffers from low aerodynamic performance, which is mainly due to the adverse torque of the returning blade. A recently introduced design suggests using pivoted blades for the rotor to eliminate the negative torque of the returning blade. In this study, the aerodynamic performance of the newly proposed turbine has been investigated experimentally and numerically. The experimental measurements are performed in a subsonic open-jet type wind tunnel facility. The numerical simulations are performed using ANSYS-Fluent commercial software, by making use of the multiple reference frame model. The effects of the number of blades (3-, 4-, and 6-bladed) on the torque and power coefficients are examined in details, at several Reynolds numbers. Results show that the new rotor has no negative torque in one complete revolution and that the 3-bladed rotor has the best aerodynamic performance, in a manner that, it reaches a maximum power coefficient of 0.21 at TSR = 0.5. Although increasing the number of blades decreases the output torque oscillations, it also decreases the average power coefficient of the rotor. Results show that Reynolds number does not have a significant effect on the average power coefficient of the rotor in the studied range of 7.7 × 104 ≤ Re ≤ 1.2 × 105.
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Wicaksono, Hangga, Sugeng Hadi Susilo, Bayu Pranoto i Muhammad Fakhruddin. "Initial Rotation Characteristic Investigation of a Hybrid Savonius - Darrieus Wind Turbine using 6 DOF Computational Fluid Dynamics". Mekanika: Majalah Ilmiah Mekanika 20, nr 1 (31.03.2021): 9. http://dx.doi.org/10.20961/mekanika.v20i1.47577.
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The inconsistency of the wind flow considered as one of the factors which tend to decrease the performance of the wind turbine. This paper proposes a further analysis of the initial rotation characteristic of a hybrid Savonius - Darrieus wind turbine. The addition of the Darrieus blade intends to increase the aerodynamic stability of the overlapping Savonius turbine. This study implements 2D CFD transient analysis using the 6DOF methods in 0<sup>0</sup>, 30<sup>0</sup>, 60<sup>0</sup>, and 90<sup>0</sup> Darrieus blade position along with 2 m/s, 4 m/s, and 6 m/s wind speed variations. The results of the aerodynamic analysis show that the location of the Darrieus 30<sup>0</sup> turbine provides the greatest initial repulsion, especially when the turbine rotation is above 90<sup>0</sup>, the position of the Darrieus blade can provide additional impulse force when the Savonius turbine tends to be passive. This effect occurs more significant at higher wind speeds. Savonius with 3-blade modification has a more stable level of force distribution than the 2-blade modification, although the value is smaller. This shows that the 3-blade Savonius provide a higher stability of angular velocity development.
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Golecha, K., M. A. Kamoji, S. B. Kedare i S. V. Prabhu. "Review on Savonius Rotor for Harnessing Wind Energy". Wind Engineering 36, nr 6 (grudzień 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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Al-Ghriybah, Mohanad, Mohd Fadhli Zulkafli, Djamal Hissein Didane i Sofian Mohd. "Performance of Double Blade Savonius Rotor at Low Rotational Speed". Journal of Computational and Theoretical Nanoscience 17, nr 2 (1.02.2020): 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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Reupke, P., i S. D. Probert. "Slatted-blade Savonius wind-rotors". Applied Energy 40, nr 1 (styczeń 1991): 65–75. http://dx.doi.org/10.1016/0306-2619(91)90051-x.
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Nachaiyaphum, Kwanjai, i Chonlatee Photong. "An electric power generation improvement for small Savonius wind turbines under low-speed wind". Indonesian Journal of Electrical Engineering and Computer Science 29, nr 2 (1.02.2023): 618. http://dx.doi.org/10.11591/ijeecs.v29.i2.pp618-625.
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<p>Savonius wind turbines have advantages of self-rotating at low speed wind, high starting torque, and less noise generation. However, they have low electric power generation capacity. This paper presents electric power generation improvement for small Savonius wind turbines when operating at low-speed wind of 1-6 m/s by using optimal Bach-type blades, twist blades and a wind tunnel. The turbine prototypes with the optimum diameter and height of 32 cm were developed with 3 different blade types: conventional semicircular blades, Bach-type blades and twisted 15° blades and a wind tunnel. The experimental results showed that the Savonius wind turbine with Bach-type generated highest electric voltage, which was 19.3% and 7.6% higher compared to conventional blades and twisted 15° blades. The additional wind tunnel could improve electric power generation efficiency by approximately 21.4% compared to the turbines without the tunnels.</p>
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Barlin, Barlin, Chandra Octavian Pratama i Krerkiat Sasiwimonrit. "THE EFFECT OF BLADE CURVATURE ANGLE OF SAVONIUS WIND TURBINE L-TYPE ON THE PERFORMANCE". Indonesian Journal of Engineering and Science 2, nr 1 (6.03.2021): 033–38. http://dx.doi.org/10.51630/ijes.v2i1.13.
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The wind is a renewable energy source (alternative energy) as a substitute for the dwindling fossil fuel. L-type Savonius wind turbine is a technology that is widely used to convert wind energy into mechanical because its construction is simple and cheap. The disadvantage of this turbine is having a lower efficiency than other types of wind turbines. Modification of the curvature of the L-type Savonius wind turbine blade is assumed can improve its performance because it affects the direction and magnitude of wind and wheel velocity, consequence impact to power. Thus, the blade angle is interesting to review. There are three angles of blade studied: 30º, 45º, and 60º. Based on results, the blade angle influences the performance of the L-type Savonius wind turbine, where the 45º blade angle produced better performance than 30º and 60º.
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Hariyadi, Herman, Leonardo Kamajaya, Fitri Fitri i Mohammad Hafidh Fadli. "Implementasi bilah savonius type u dengan variasi kemiringan sudu bilah savonius pada modul ajar pembangkit listrik tenaga bayu". JURNAL ELTEK 19, nr 2 (29.10.2021): 25. http://dx.doi.org/10.33795/eltek.v19i2.307.
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ABSTRAKPertumbuhan dan konsumsi listrik yang tidak berimbang serta tingkat polusi yang terus meningkat, mendorong banyak penelitian tentang pembangkit listrik energi baru dan terbarukan. Salah satu energi terbarukan yang menghasilkan energi listrik adalah pembangkit listrik tenaga bayu. Turbin angin jenis savonius merupakan turbin yang sesuai dioperasikan dengan kecepatan angin yang relatif rendah dan cocok digunakan sebagai pembangkit listrik berskala kecil. Pada penelitian ini penulis juga mengkaji konfigurasi variasi kemiringan sudu bilah savonius tipe u overlap dan tipe u non-overlap. Agar mengetahui spesifikasi teknik pembangkit listrik tenaga bayu ini, penulis merancang prototype pembangkit listrik tenaga bayu turbin savonius dengan variasi kecepatan angin 0-8 m/s, variasi kemiringan sudu turbin sebesar 00, 150 dan 300. Berdasarkan percobaan yang telah dilakukan turbin dengan kemiringan sudu 150 pada bilah savonius non overlap menghasilkan tegangan dan RPM paling tinggi. Rata-rata tegangan yang dihasilkan pada kemiringan sudu tersebut adalah 3,61V pada 1081 RPM, dan arus keluaran mencapai 950mA dengan beban resistor 10Ω. Data logger digunakan untuk menyimpan data berbagai sensor tersebut kemudian di plot dalam bentuk grafik dengan komunikasi serial ke PC untuk selanjutnya dianalisa.
ABSTRACTThe growth and disproportionate consumption of electricity as well as the level of pollution continues to increase, prompting a lot of research on new and renewable energy power generation. One of the renewable energies that produces electrical energy is wind power generation. The savonius type wind turbine is a turbine that is suitable for operation with relatively low wind speeds and is suitable for use as small-scale power plants. In this study, the author also examines the configuration of the savonius blade slope variations, type u overlap and type u non-overlap. In order to know the technical specifications of this wind power plant, the author designed a prototype of the Savonius turbine wind power plant with wind speed variations of 0-8 m/s, turbine blade slope variations of 00, 150 and 300. Based on experiments that have been carried out turbines with blade slopes 150 on non-overlap savonius blades produces the highest voltage and RPM. The average voltage produced on the slope of the blade is 3.61V at 1081 RPM, and the output current reaches 950mA with a load resistor of 10Ω. The data logger is used to store data on various sensors and then plotted in the form of a graph with serial communication to a PC for further analysis.
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Awg. Osman, Dygku Asmanissa, Norzanah Rosmin, Aede Hatib Mustaamal, Siti Maherah Hussin i Md Pauzi Abdullah. "Performance of a Small-sized Savonious Blade with Wind Concentrator". Indonesian Journal of Electrical Engineering and Computer Science 10, nr 3 (1.06.2018): 1227. http://dx.doi.org/10.11591/ijeecs.v10.i3.pp1227-1233.
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<span>This paper presents the performance of a fabricated small-sized Savonious wind turbine with two blades. The design of Savonius vertical axis wind turbine (VAWT) was based on Malaysia wind speed condition. Meanwhile, the design of wind concentrator was based on the dimensions and the constant airflow of an air compressor. From the experimental testing in a laboratory, it was found that the proposed Savonious turbine has best performance when tested using wind concentrator. To conclude, airflow from air compressor can be increased when the proposed wind concentrator is used and hence increasing the proposed VAWT performance in terms of its angular speed (ω), tip speed ratio (TSR) and the generated electrical power (PE).</span>
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Al-Janan, Dony Hidayat, i Maulana Iwan Saputra. "OPTIMASI DESAIN SUDU TURBIN DENGAN PADUAN SAVONIUS DAN DARRIEUS UNTUK MENINGKATKAN DAYA". Jurnal Rekayasa Mesin 14, nr 2 (15.08.2023): 677–87. http://dx.doi.org/10.21776/jrm.v14i2.1430.
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In this study, the effectiveness of the combination of the Savonius and Darrieus wind turbines was investigated, which is a vertical axis wind turbine. The aim is to determine the optimal blade design and analysis of the combined blade design compared to the stand-alone design. The method used is CFD simulation to find the torque value used for power calculation. From all simulations, the highest torque and power occurred at a wind speed of 5.58 m/s. The simulation shows the Savonius, Darrieus, and Savonius-Darrieus combination turbine variations, - so then as result from the Savonius-Darrieus combination obtained the best results, namely the torque of 82.59 Nm and the power of 2194.41 W. In conclusion, the turbine model with a combined blade design produces better torque and power compared to stand-alone turbine models.
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Rendi, Rendi, Budi Hartadi, Muhammad Firman i Muhammad Irfansyah. "Peningkatan Kinerja Rotor Savonius Dengan Mengembangkan Sudu Baru Berbasis Airfoil". Jurnal Engine: Energi, Manufaktur, dan Material 6, nr 2 (26.11.2022): 08. http://dx.doi.org/10.30588/jeemm.v6i2.1078.
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<p><em>The development of new and renewable energy is currently a top priority for the international community, as energy needs continue to increase while fossil fuels are running low. The Savonius rotor turbine is one of the most widely used turbines but has low efficiency. This study aims to improve the performance of the Savonius turbine by developing a new blade based on airfoil which is simulated in CFD. There are 2 blade models to be simulated, namely the RD-1 model and the RD-2 model, then the simulation results are compared with the conventional blade. The results of the study can be said that the new airfoil-based blade can improve the performance of the Savonius turbine, the increase occurs in the TSR value which is better than the conventional blade. The highest Cp is 0.148 on the RD-2 model blade with a maximum TSR of 0.8</em></p>
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Mendoza, Victor, Eirini Katsidoniotaki i Hans Bernhoff. "Numerical Study of a Novel Concept for Manufacturing Savonius Turbines with Twisted Blades". Energies 13, nr 8 (12.04.2020): 1874. http://dx.doi.org/10.3390/en13081874.
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This work presents a numerical study of the aerodynamic performance and the resulting flow field of two novel Savonius wind turbines with twisted blades. The novelty relies on the blade manufacturing process which is characterized by a ‘twisted cut’ through the central axis of a hollow cylinder (tube), followed by a partial twisted cut in the range of 90°. This approach does not require any expensive fabrication process such as blade molding and/or 3D prints, and, therefore, it can potentially mitigate the production costs. The main goal is to investigate the operational parameters and the overall performance of the presented devices, which are currently being operated in atmospheric conditions. For this purpose, three-dimensional simulations have been performed using the open-source CFD library OpenFOAM in order to solve the governing equations and for characterizing the main phenomena involved in the flow pattern. The Reynolds-averaged Navier–Stokes (RANS) approach together with the k − ω SST model were employed to reproduce the flow turbulence effects. This model is validated using wind tunnel measurements of the power ( C P ) and torque ( C M ) coefficients from a straight blade Savonius turbine. Unsteady simulations of the two turbine prototypes were investigated at different tip speed ratio TSR ( λ ) by varying the rotational speed of the rotor while keeping constant the free stream (rated) velocity V ∞ . The results were compared against the Savonius turbine employed for validating the model. Aerodynamic loads and general wake structure were studied at the optimal operational conditions as well. For the same turbine configurations, the new blade geometry improved the performance by 20–25% (at its optimal TSR), compared to the conventional straight blade Savonius rotor, as well as the reducing torque fluctuation.
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Yohana, Eflita, MSK Tony Suryo U, Binawan Luhung, Mohamad Julian Reza i M. Badruz Zaman. "Experimental Study of Wind Booster Addition for Savonius Vertical Wind Turbine of Two Blades Variations Using Low Wind Speed". E3S Web of Conferences 125 (2019): 14003. http://dx.doi.org/10.1051/e3sconf/201912514003.
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The Wind turbine is a tool used in Wind Energy Conversion System (WECS). The wind turbine produces electricity by converting wind energy into kinetic energy and spinning to produce electricity. Vertical Axis Wind Turbine (VAWT) is designed to produce electricity from winds at low speeds. Vertical wind turbines have 2 types, they are wind turbine Savonius and Darrieus. This research is to know the effect of addition wind booster to Savonius vertical wind turbine with the variation 2 blades and 3 blades. Calculation the power generated by wind turbine using energy analysis method using the concept of the first law of thermodynamics. The result obtained is the highest value of blade power in Savonius wind turbine without wind booster (16.5 ± 1.9) W at wind speed 7 m/s with a tip speed ratio of 1.00 ± 0.01. While wind turbine Savonius with wind booster has the highest power (26.3 ± 1.6) W when the wind speed of 7 m/s with a tip speed ratio of 1.26 ± 0.01. The average value of vertical wind turbine power increases Savonius after wind booster use of 56%.
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Abdul Alim, Muhammad Iyas. "Effect of Turbine Blades Transformation on Savonius Turbine Performance". Mekanika: Majalah Ilmiah Mekanika 21, nr 1 (14.04.2022): 26. http://dx.doi.org/10.20961/mekanika.v21i1.48619.
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<pre>The purpose of this study was to determine the effect of the transformation of savonius turbine blades using the Cp-TSR curve. The transformation referred to here is the change in the angular of the blade so that the area of the cross section of the blade moving downwind changes, by doing so the negative torque of the turbine obtained from the air flow is reduced. The specimen has 3 variations, namely, without transformation or conventional turbine and transformation of 5 and 10 degrees. With the reduction in the cross sectional area of the turbine blades, the authors hypothesize that the turbine performance will increase, but the blade transformation movement causes a shift in the center of mass which gives rise to vibrations that can directly affect turbine performance, and it could be that the negative effect from these vibrations is much greater than the positive effect from reducing torque. Experiments were carried out using wind tunnels with load variations at 5, 6, and 7 m/s speed variations. The experimental results obtained show that conventional turbines have better performance than turbines with 5</pre><sup>o</sup><pre> and 10</pre><sup>o</sup><pre> blade transformations.</pre>
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Wu, Kuo-Tsai, Kuo-Hao Lo, Ruey-Chy Kao i Sheng-Jye Hwang. "Numerical and Experimental Investigation of the Effect of Design Parameters on Savonius-Type Hydrokinetic Turbine Performance". Energies 15, nr 5 (2.03.2022): 1856. http://dx.doi.org/10.3390/en15051856.
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To meet the increased demand of hydroelectric power generation, a novel drag-based Savonius turbine with the characteristics of a simpler fabrication process and good starting characteristics is designed, fabricated, and analyzed. The newly designed turbine is suitable to be installed in rivers, irrigation channels, ocean currents, etc., for small-scale hydroelectric power generation. In the present study, experiments are carried out to investigate the influence of the design parameters of this turbine on its power performance in order to improve its efficiency, including blade arc angles (180°, 135°), blade placement angles (0°, ±22.5°), and the number of blades (2, 3, 6, and 8). Further, three-dimensional CFD simulations are performed with Re = 6.72×105, matching the experimental conditions, in order to study the changes in the flow field and the rotation characteristics of the turbine. The research results indicate that a six-bladed turbine with a blade arc angle of 135° and a blade placement angle of 0° has higher torque and better power performance, which makes it the most suitable design when also considering cost. Furthermore, it was found that an increase in the number of turbine blades contributes to improving the performance of the turbine. The maximum power coefficient is 0.099 at a tip speed ratio of 0.34.
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Delffika Canra, Meri Rahmi i Ikhsan. "Kaji Eksperimen lengkungan Sudu Turbin Angin Savonius Tipe-U". Jurnal Ilmiah Poli Rekayasa 14, nr 2 (15.04.2019): 8. http://dx.doi.org/10.30630/jipr.14.2.122.
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Wind energy sources in coastal areas of Indonesia are generally one of the potential renewable energy sources (renewable energy resources) that are abundant, environmentally friendly and renewable. Savonius wind turbines can produce relatively high torque even at low wind speeds. Because it is very well developed to produce electrical energy. To get a large amount of electrical power, a large turbine construction is also needed which also requires a large amount of money, of course. For this reason, the dimensions of this wind turbine construction need to be developed, known as aspect ratio (Ar). Ar which has been studied is the cross section of the blade, as well as other values. Whereas the arch depth or blade length of type U is still likely to be studied. Therefore it is necessary to do research on type U blade arcs to get more power than before. Experimental method by making a prototype savonius type U wind turbine with 2 blades. The parameters varied only in terms of the ratio of arc length and blade cross section, other parameters followed the previous study. The expected experimental results get the aspect ratio (Ar) of the best blade in capturing wind energy and producing large electrical power.
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Kurniawan, Kurniawan, Tri Pratomo, Nurhaidah Nurhaidah, Devi Andriani i Supandi Supandi. "Laboratory tests of blade radius variation on vertical shaft savonius turbine performance". ARMATUR : Artikel Teknik Mesin & Manufaktur 4, nr 1 (24.02.2023): 1–9. http://dx.doi.org/10.24127/armatur.v4i1.3292.
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Wind turbines are one of the machines that are currently still used to convert wind kinetic energy so that they can be used by humans such as to drive pumps in agriculture and produce electrical energy. Savonius turbine is a vertical axis turbine that is currently widely used as an electrical energy generator, this wind turbine is a type of drag type wind turbine that has a simple design that is in the form of a semicircular curved blade side. Therefore, the author is interested in researching the resulting performance including turbine rotational speed, power generated, and wind turbine efficiency against the variation of the blade radius. The method used is experimental, the stages of this research are in the form of literature studies, making savonius turbines, testing savonius turbines with variations in blade radius as well as data retrieval, data processing, and analysis. Based on the data obtained, the rotating speed of the turbine is influenced by variations in the radius of the blade. The larger the blade radius, the smaller the turbine rotational speed. The maximum turbine rotation speed at blade radius 63 is 173 rpm, while at blade radius, 88 is 118 rpm and at blade radius 113 is 115 rpm. So the highest turbine rotating speed at a radius of 63.
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Mrigua, Khalid, Abdelghani Toumi, Mounia Zemamou, Bader Ouhmmou, Yahya Lahlou i Mohammed Aggour. "CFD Investigation of A New Elliptical-Bladed Multistage Savonius Rotors". International Journal of Renewable Energy Development 9, nr 3 (29.06.2020): 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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Tang, Zhi Peng, Ying Xue Yao, Liang Zhou, Jin Ming Wu i Bo Wen Yu. "Simulation Analysis of Savonius Turbine with Self-Rotating Blades". Advanced Materials Research 614-615 (grudzień 2012): 480–84. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.480.
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This paper analyzed the advantages of traditional Savonius (S-type) turbine and the reasons of its low efficiency, proposed a new type of turbine with self-rotating blades and surrounded by a rectifier, and studied the aerodynamic performance by numerical simulations. The turbine is composed of a rectifier and a rotor, the rectifier consists by straight and arc segments which can accelerate the wind speed and adjust the inflow wind angle. The self-rotating blade can reduce the impacted area acting on the leeward blade by wind and arm of the impact torque, therefore reduces the resistant torque of the blade, and the driving torque acting on the windward blade is almost the same with traditional S-type turbine, which can increase the overall driving torque. The result shows that the new turbine has the advantages as below: wide range of wind speed for effective working, high power coefficient (Cp), suitable for low wind speed aera etc. Although the flow field in S-type turbine is complex separating flow, the performance of the turbine proposed in this paper is improved and is better than traditional S-type turbine in numerical simulation which is worth for spreading.
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Kaprawi Sahim i Sawalluddin Sawalluddin. "Rancang Bangun dan Pengujian Anemometer Untuk Sudu Savonius". Jurnal Rekayasa Mesin 20, nr 1 (1.03.2020): 1–6. http://dx.doi.org/10.36706/jrm.v20i1.68.
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In obtaining wind speed data, it is needed a tool that is able to capture the speed of the wind that is converted to the rotation of the shaft. The tool is called an anemometer, has a wind-driven blade principle where the blades are normally used 3 pieces or 4 blades, but in this design use 3 blades with blade diameter D = 40 mm with radio circular anemometer 180 mm. by arduino and converted through calculations that have been set on the computer using the arduin software. By conducting testing it is expected that the designed anemometer has the same wind speed (Va) value in calculating wind speed. testing by comparing the results of the standard deviation (?) of the product anemometer or design, and also the comparison of values from the results of wind speed (Va) which is tested in the laboratory of the basic phenomena of mechanical engineering with a range of wind speeds tested around 1 m / s to 10 m / s. the standard deviation (?) is obtained for the product anemometer of 3.478% and the design anemometer of 11.07% and the design anemometer has an error data on the product anemometer of 0.4%.
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Prasetyo, Yuli, i Teuku Multazam. "ANALISA PERBEDAAN KINERJA TURBIN ANGIN TIPE SAVONIUS DENGAN SAVONIUS HELIUS". Jurnal Geuthèë: Penelitian Multidisiplin 2, nr 2 (15.10.2019): 259. http://dx.doi.org/10.52626/jg.v2i2.40.
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Kemajuan teknologi telah sampai pada penggunaan energi alternatif sebagai pengganti sumber energi utama. Pemanfaatan sumber energi terbarukan antara lain energi angin sebagai energi alternatif yang dipakai untuk membangkitkan energi listrik. Oleh karena itu, pada penelitian ini dirancang sebuah prototipe turbin angin dengan poros vertikal (Vetical Axis Wind Turbine) tipe Savonius dan Savonius Helius sebagai solusi pemenuhan listrik dengan pemanfaatan energi alternatif terbarukan. Tahap penelitian meliputi perencanaan, pembuatan prototipe, dan pengujian prototipe. Proses pengujian prototipe dilakukan dengan menggunakan variasi kecepatan angin sebesar 2 m/s, 3 m/s, 4 m/s, 5 m/s dan membandingkan kecepatan putaran (Rpm) antara tipe Savonius dengan tipe Savonius Helius. Hasilnya menunjukkan bahwa turbin angin tipe Savonius memiliki kecepatan putaran tertinggi sebesar 229,2 Rpm pada kecepatan angin 5,9 m/s dan tidak dapat berputar pada kecepatan angin 2 m/s. Sedangkan tipe Savonius Helius dengan variasi sudut per-blade 22,5° menunjukkan kecepatan putaran tertinggi sebesar 222,4 Rpm pada kecepatan angin 5,9 m/s dan paling rendah sebesar 47,8 Rpm pada kecepatan angin 2,0 m/s. Berdasarkan hasil tersebut, dapat disimpulkan bahwa turbin angin tipe Savonius Helius dengan variasi sudut per-blade 22,5° mampu menghasilkan kecepatan putaran yang relatif tinggi dan dapat berputar pada kecepatan angin yang rendah.
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Masykur, Masykur, Andre Kurniadi, Maidi Saputra i Murhaban Murhaban. "Studi Numerik Pengaruh Sudut Kemiringan Sudu Terhadap Performa Turbin Angin Vertikal Tipe Savonius". Jurnal Mekanova: Mekanikal, Inovasi dan Teknologi 7, nr 1 (4.06.2021): 25. http://dx.doi.org/10.35308/jmkn.v7i1.3634.
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AbstractWind energy is a renewable energy source that can be felt in everyday life. To convert wind energy into electrical energy, a tool is needed that is a wind turbine. Horizontal Axis Wind Turbine is more widely used and developed today than the vertical type wind turbine. However, the vertical turbine has several advantages compared to the horizontal wind turbine, which is that it can move without depending on the direction of the wind. This study aims to determine the effect of tilt angel of savonius turbine with blades angle 30°, 60° and 90° the turbine power coefficient and determine the optimal turbine blade results in designing a Vertical wind turbine by simulation using Computational Fluid Dynamics (CFD). The variations used are tilt angel turbine blades is 30°, 60°, 90°. The results showed that the value of Cp (Power Coefficient) of wind turbines with the addition of the blade angel 30°, 60° and 90° had a different increase. The variation the addition of turbine blade tilt angle with 90° tilt angle can increase the efficiency of the turbine blade when compared 30°, 60° blade inclination this is evidenced by wind turbine speed contour analysis, wind vortex contour analysis and turbulence intensity contour analysis shows that the turbine blade simulation results with a slope of 90° has an efficient turbine blade that is very good and effective and get optimal results.Keywords: Wind turbine, VAWT, CFD, Efficiency, Contour, Optimal, TSR, power
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Norouztabar, Reza, Seyed Soheil Mousavi Ajarostaghi, Seyed Sina Mousavi, Payam Nejat, Seyed Saeid Rahimian Koloor i Mohamed Eldessouki. "On the Performance of a Modified Triple Stack Blade Savonius Wind Turbine as a Function of Geometrical Parameters". Sustainability 14, nr 16 (9.08.2022): 9816. http://dx.doi.org/10.3390/su14169816.
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The Savonius wind turbine is one of the most well-known vertical axis wind turbines with insensitivity to wind direction, flow turbulence, and high torque generation. These turbines can extract up to 20% of the energy from the wind. This study numerically analyzes the performance of a modified Savonius wind turbine equipped with secondary blades and slots. The k-ε standard method is used to simulate the turbulence flow around the turbine, and the simulation is performed using the ANSYS FLUENT 18.2 commercial code. The effects of distance between the main blade and the secondary blade, position of the secondary blade, the width of the main blade’s slot, and the profile of the secondary blade on the produced torque are studied and analyzed. The simulation is performed at four wind velocities: 3, 4, 5, and 6 m/s. The results showed that the output torque at the secondary blade angular position β = 130 is higher than other angles. Furthermore, by increasing the radius of the additional blade from R = 25 to 43 mm, the torque is improved, and the area below the output torque curve is increased. Moreover, the results showed that creating a slot on the main blade equipped with a secondary blade has a significant impact on the produced torque; however, the geometrical parameters of the proposed rotors should be adjusted accurately to find the best case in terms of the produced torque.
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Zhang, Hongfu, Zhiqiang Li, Dabo Xin i Jian Zhan. "Improvement of Aerodynamic Performance of Savonius Wind Rotor Using Straight-Arc Curtain". Applied Sciences 10, nr 20 (16.10.2020): 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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Varia, Manthan N. "Aerodynamic Analysis of Novel Savonius Rotor". International Journal for Research in Applied Science and Engineering Technology 9, nr 11 (30.11.2021): 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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Canra, Delffika, Meri Rahmi i Emin Haris. "Analisa Aliran Angin Pada Sudu Turbin Angin Savonius Tipe-U Berbasis Software". JTT (Jurnal Teknologi Terapan) 4, nr 2 (22.10.2018): 93. http://dx.doi.org/10.31884/jtt.v4i2.123.
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Generally, wind energy sources in Indonesia's coastal areas is one of the potential sources of renewable energy (renewable energy resources) which are abundant, environmentally friendly and renewable. Savonius wind turbines can produce relatively high torque even at low wind speeds. Because it is very well developed to produce electrical energy. To get a large electric power, a large turbine construction is also needed which also certainly requires a large cost. For this reason, it is necessary to develop the dimensions of this wind turbine construction which is known as aspect ratio (Ar). The Ar that has been researched is the blade section, and other values. While the arch depth or the length of the blade arc in U -type is still likely to be researched. Therefore, it is necessary to do research on the U-type blade arc to get greater power than before. In addition to the experimental method with a prototype of the U type Savonius wind turbine with a number of 2 blades, a software-based simulation method will be carried out to analyze the air flow on the wind turbine blade. Parameters varied only with the aspect ratio of the arc length and blade cross section width, other parameters follow the previous research. This analysis will be a comparative data with experimental methods. The expected simulation results obtain the best aspect ratio (Ar) blade in capturing wind energy.
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Elmekawy, Ahmed M. Nagib, Hassan A. Hassan Saeed i Sadek Z. Kassab. "Performance enhancement of Savonius wind turbine by blade shape and twisted angle modifications". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 235, nr 6 (11.01.2021): 1487–500. http://dx.doi.org/10.1177/0957650920987942.
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Three-dimensional CFD simulations are carried out to study the increase of power generated from Savonius vertical axis wind turbines by modifying the blade shape and blade angel of twist. Twisting angle of the classical blade are varied and several proposed novel blade shapes are introduced to enhance the performance of the wind turbine. CFD simulations have been performed using sliding mesh technique of ANSYS software. Four turbulence models; realizable k -[Formula: see text], standard k - [Formula: see text], SST transition and SST k -[Formula: see text] are utilized in the simulations. The blade twisting angle has been modified for the proposed dimensions and wind speed. The introduced novel blade increased the power generated compared to the classical shapes. The two proposed novel blades achieved better power coefficients. One of the proposed models achieved an increase of 31% and the other one achieved 32.2% when compared to the classical rotor shape. The optimum twist angel for the two proposed models achieved 5.66% and 5.69% when compared with zero angle of twist.
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Nawir, Herman, Muhammad Ruswandi Djalal, Adnan Ainun Hasri i Andi Wely Fauziah. "Modification of the Vertical Axis with Variations in the Number of Blades of the Savonius Wind Turbine". Journal of Advanced Technology and Multidiscipline 2, nr 1 (31.05.2023): 1–9. http://dx.doi.org/10.20473/jatm.v2i1.40610.
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The potential wind speed in Indonesia is generally low at 3 m/s to 7 m/s so that this type of vertical axis turbine is considered very suitable for use in wind conditions in Indonesia. There are several types of vertical axis wind turbines. One type of vertical axis wind turbine is the Savonius wind turbine. Many advantages that this type of wind turbine has, such as being able to receive wind from all directions, easy and cheap to manufacture, and can rotate at a fairly low angular speed. This test was carried out to determine the performance of conventional and modified savonius turbines with 2 and 3 blades variables in each turbine blade shape. The form of modification made is by changing the shape of the blade twisting by 45o. The turbine is carried out on a laboratory scale with a wind source using a fan that is directly opposite the turbine. The results showed that the highest turbine power occurred in a modified 2-blade turbine, namely 1.88 Watt with a torque value of 0.04 Nm and a shaft rotation of 450 rpm. The highest rotation value is also obtained by 2 modified blades at a wind speed of 6 m/s producing 896 rpm. However, the highest torque value is obtained by a conventional 2-blade turbine with a value of 0.136 Nm. The highest turbine efficiency in each turbine is obtained by a modified 2 blade turbine with an efficiency value of 36.92% while the highest turbine efficiency for a modified 3 blade turbine reaches 11.69% which is considered less efficient than other turbines.
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Kaprawi Sahim, Ilyas, Nurhadi, Dewi Puspita Sari, Imam Syofii, Muhammad Amsal Ade Saputra i Dendy Adanta. "Experimental Study of Darrieus Water Turbine Two Blade Different Configuration and Hybrid Turbine for Application of an Irrigation Flow". Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 98, nr 2 (29.09.2022): 58–66. http://dx.doi.org/10.37934/arfmts.98.2.5866.
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Rice fields are areas that have irrigation and rarely have lighting; this is dangerous at night because wild animals such as snakes are difficult to see. Irrigation has low-scale water energy with low-head conditions; hence the Darrieus and Savonius type water turbines are considered suitable for this condition. However, until now, there has been no comprehensive study of the feasibility of the two turbines for irrigation flow. Hence this study presents the experimental work to explore the performances of the Darrieus turbines Two Blade Different Configuration and hybrid Darrieus-Savonius turbine for irrigation flow. Accordingly, four configurations of the water turbines used in these investigations, i.e., Darrieus turbine with two different blades shape the aerofoil of NACA 0016 and NACA 0020, single Darrieus turbine with the aerofoil NACA 0016, single Savonius turbine, and hybrid Darrieus-Savonius turbine with the aerofoil NACA 0016. The mechanical power of the water turbines was measured using a rope brake dynamometer. The results show that the single Darrieus turbine with the aerofoil NACA 0016 has higher tip speed ratios but a lower torque coefficient than the single Savonius turbine. Then, hybrid Darrieus-Savonius turbine with the aerofoil NACA 0016, the maximum power coefficient lower than other. Furthermore, the single Savonius turbine has the highest power coefficient than the other. And the single Darrieus turbine with the aerofoil NACA 0016 shows that the turbine has higher torque than others. Thus, based on the results, a single Darrieus turbine with the aerofoil NACA 0016 is recommended for application.
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Sule, L., i P. T. D. Rompas. "Performance of Savonius Blade Waterwheel with Variation of Blade Number". IOP Conference Series: Materials Science and Engineering 306 (luty 2018): 012073. http://dx.doi.org/10.1088/1757-899x/306/1/012073.
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Sudargana, Sudargana, Bambang Yunianto, Abiseka M. i Teguh Priyo Utomo. "TEST CHARACTERISTICS OF THE TURBINE SAVONIUS 4 LEVELS SECTIONAL, PARTITIONED, 0.25 DIAMETER OVERLAP AND 45o SLIDING ANGLE WITH COMPARABLE STANDARD TURBINE". ROTASI 16, nr 2 (1.04.2014): 14. http://dx.doi.org/10.14710/rotasi.16.2.14-17.
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The energy and environmental crisis where CO2 causes global warming and climate change. This condition encourage the world community take advantage of new renewable energy non-CO2 as wind, water currents, geothermal, solar, etc. Savonius Turbine has a simple construction can be made by the public so they can be used for wind power or hydro countryside. In this study aims to improve the efficiency and reduce the amplitude of vibrations to the modification of the 4-storey Savonius turbine, partitioned, sliding angle 45 degree and 0.25 diameter blade overlap. The location of research is Cokro Tulung Channel Klaten and Parangrucuk Baron Beach Gunungkidul. Measurements such as water current and wind speed, turbine rotational speed, torque of the turbine shaft and power. The turbines analysis are torque, power and efficiency characteristics and comparing by the turbine Savonius standard (one pair of blades). Results as hydro turbine at low velocity 0.3166 m/s Savonius 4 level had better revolution and efficient (0.0826) than 1 level (0.024), but as wind turbine at 3.056 m/s velocity the Savonius 4 level had worse efficiency (0.039) than 1 level (0.025) because the inertia load
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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, nr 11 (30.09.2015): 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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Fanel Dorel, Scheaua, Goanta Adrian Mihai i Dragan Nicusor. "Review of Specific Performance Parameters of Vertical Wind Turbine Rotors Based on the SAVONIUS Type". Energies 14, nr 7 (1.04.2021): 1962. http://dx.doi.org/10.3390/en14071962.
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Increasing energy demand and environmental regulations around the world provide an adequate framework for developing methods of obtaining energy from renewable sources. Wind force is a resource with a high potential through which green energy can be obtained with no negative impact on the environment. Different turbine typologies have been developed, which can convert the wind force into mechanical and electrical energy through turbine rotational motion. Starting from the classic vertical-axis SAVONIUS rotor model, other models have been designed, which, according to the numerical studies and experimental test results, show higher performance parameters in operation. Such models present specific rotor blade geometries to achieve better operational results in terms of shaft torque and generated power. There are multiple research results from numerical analysis on virtual models or experimental tests that use rotor models in different constructive configurations aiming to improve operation performance. These research activities are related to the rotor blade number, the aspect and overlap ratio values, the blade profile geometry modification, the use of end plates connected to the rotor blades, curtain mounting solutions for directing the air flow on the active blade alone, and rotor constructive variants with deformable blades during operation. Some of the results obtained from the mentioned research activities are shown in this review for special rotor configurations whose performance results in terms of torque or power values are compared to the classical SAVONIUS model.