Academic literature on the topic 'Savonius wind turbina'
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Journal articles on the topic "Savonius wind turbina"
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Rech, Charles, Andre Francisco Caldeira, Cristiano Frandalozo Maidana, Carlos Eduardo de Souza, Greice Scherer Ritter, Pericles Nicolau Balafa, and Simone Ferigolo Venturini. "FREIO DE FOUCAULT APLICADO À MEDIÇÃO DE POTÊNCIA EM TURBINA EÓLICA SAVONIUS / EDDY BRAKE APPLIED TO POWER MEASUREMENT IN WIND TURBINE SAVONIUS." Brazilian Journal of Development 7, no. 2 (2021): 12818–33. http://dx.doi.org/10.34117/bjdv7n2-074.
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Basuki, Mohammad Munib Rosadi, Retno Eka Pramitasari, and Fajar Satriya Hadi. "ANALISIS PERFORMA KINERJA TURBIN ANGIN SAVONIUS 2 SUDU." Discovery : Jurnal Ilmu Pengetahuan 5, no. 2 (October 18, 2020): 58–63. http://dx.doi.org/10.33752/discovery.v5i2.995.
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Abstract: Renewable energy sources are energy sources that can replace the use and use of fossil energy sources where they are very abundant and have not been widely used for their existence. Therefore, to bring up new ideas in terms of creating or changing renewable energy, there needs to be a match between the education curriculum and market needs. So to arouse the enthusiasm and motivation of students in the teaching and learning process, especially in the energy conversion machine course for mechanical engineering students, it needs media and learning methods. The purpose of this research is to know how to design a savonius wind turbine props, and the working principle, and analyze the performance of the wind turbine. The sequence of the process of making savonius wind turbines comprises of making: (1) frameworks and machine tables, (2) chimneys, (3) duct, (4) installation of fans, (5) turbine holder (6) two blades savonius turbines and servo motor holder. The working principle of a wind turbine is a turbine rotation caused by the wind being transmitted to the generator rotor, where the generator has a copper coil that functions as a stator which will produce an electric voltage. From this research produced a savonius wind turbine tool which is used as a learning medium in the Mechanical Engineering Study Program. From the results of savonius type wind turbine test equipment produced the following data: maximum voltage of 10 volts, wind speed of 8.5 m / s, rotor generator rotation of 2734 rpm and power of 340 watts.
Keywords: Energy, Turbine, Wind, Savonius
Abstrak: Sumber energi terbarukan adalah sumber energi yang dapat menggantikan pemanfaatan dan penggunaan sumber energi fosil dimana keberadaannya sangat melimpah dan belum banyak digunakan akan keberadaannya. Oleh karena itu untuk memunculkan ide ide baru dalam hal menciptakan atau mengubah energi terbarukan ini perlu adanya kesesuaian antara kurikulum pendidikan dengan kebutuhan pasar. Maka untuk membangkitkan semangat dan motivasi mahasiswa dalam proses belajar mengajar khususnya dalam mata kuliah Mesin Konversi Energi bagi mahasiswa teknik mesin maka perlu media dan metode pembelajaran. Tujuan dari penelitian ini adalah mengetahui cara mendesain sebuah alat peraga turbin angin savonius, mengetahui prinsip kerja, dan menganalisa dari performa kinerja dari turbin angin tersebut. Urutan proses pembuatan turbin angin savonius adalah (1) pembuatan kerangka dan meja mesin, (2) pembuatan cerobong angin, (3) pembuatan duct, (4) pemasangan kipas angin, (5) pembuatan dudukan turbin, (6) pembuatan turbin savonius 2 sudu dan pembuatan dudukan motor servo. Prinsip kerja turbin angin adalah putaran turbin yang disebabkan oleh angin diteruskan ke rotor generator, dimana generator memiliki lilitan tembaga yang berfungsi sebagai stator yang akan menghasilkan tegangan listrik. Dari penelitian tersebut dihasilkan sebuah alat turbin angin savonius yang digunakan sebagai media pembelajaran di Program Studi Teknik Mesin. Dari hasil pengujian alat turbin angin tipe savonius menghasilkan data sebagai berikut: tegangan maksimal sebesar 10 volt, kecepatan angin 8.5 m/s, putaran rotor generator 2734 rpm dan daya sebesar 340 watt.
Kata kunci: Energi, Turbin, Angin, Savonius
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Awg. Osman, Dygku Asmanissa, Norzanah Rosmin, Aede Hatib Mustaamal, Siti Maherah Hussin, and Md Pauzi Abdullah. "Performance of a Small-sized Savonious Blade with Wind Concentrator." Indonesian Journal of Electrical Engineering and Computer Science 10, no. 3 (June 1, 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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Yohana, Eflita, MSK Tony Suryo U, Binawan Luhung, Mohamad Julian Reza, and 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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Ali, Nawfal M., Dr A. K. Abdul Hassan, and Dr Sattar Aljabair. "Effect of Conventional Multistage Savonius wind Turbines on the Performance of the Turbine at Low Wind Velocity." Journal of Advanced Research in Dynamical and Control Systems 11, no. 11 (November 20, 2019): 229–39. http://dx.doi.org/10.5373/jardcs/v11i11/20193192.
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Wicaksono, Yoga Arob. "Studi Komputasi: Pengaruh Desain Guide Vane Terhadap Performa dan Pola Aliran di Sekitar Turbin Angin Savonius." Jurnal Pendidikan Teknik Mesin Undiksha 8, no. 2 (August 1, 2020): 43. http://dx.doi.org/10.23887/jptm.v8i2.26856.
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Turbin angin adalah salah satu alternatif untuk mengurangi beban listrik di wilayah perkotaan. Di wilayah perkotaan terdapat gedung bertingkat dengan jumlah yang cukup banyak. Sehingga menjadi lokasi yang tepat untuk aplikasi turbin angin sekaligus mengurangi beban listrik. Tipe turbin yang tepat untuk aplikasi gedung bertingkat adalah turbin angin sumbu vertikal (VAWT). Salah satu jenis VAWT adalah turbin Savonius. Turbin angin Savonius konvensional memiliki kinerja yang rendah seperti koefisien daya dan torsi yang rendah dibandingkan dengan turbin angin jenis lain. Ini terjadi karena aliran angin dapat menyebabkan tekanan negatif pada salah satu sisi sudu. Untuk mengatasi masalah ini, turbin angin Savonius konvensional dikombinasikan dengan guide vane. Tujuan dari penelitian ini adalah untuk mempelajari pengaruh guide vane terhadap performa dan karakteristik pola aliran sekitar turbin angin Savonius. Model numerik dihitung menggunakan persamaan Navier-Stokes dengan model turbulen k-ε standar. Analisa menggunakan software ANSYS-Fluent R15. Simulasi dilakukan pada arah angin yang berbeda, antara lain: 0o, 30o, 60o pada kecepatan angin 2 m/s. Hasil penelitian menunjukkan bahwa guide vane mampu menambah laju aliran udara yang menuju sudu turbin dan meningkatkan performa turbin angin Savonius sebesar 22,2%. Kata kunci: CFD, guide vane, performa, pola aliran, turbin angin SavoniusDaftar RujukanAkwa, J. V., Alves, G., & Petry, A. P. (2012). Discussion on the veri fi cation of the overlap ratio in fl uence on performance coef fi cients of a Savonius wind rotor using computational fl uid dynamics. 38, 141–149. https://doi.org/10.1016/j.renene.2011.07.013Akwa, J. V., Vielmo, H. A., & Petry, A. P. (2012). A review on the performance of Savonius wind turbines. Renewable and Sustainable Energy Reviews, 16(5), 3054–3064. https://doi.org/10.1016/j.rser.2012.02.056Alessandro, V. D., Montelpare, S., Ricci, R., & Secchiaroli, A. (2010). Unsteady Aerodynamics of a Savonius wind rotor : a new computational approach for the simulation of energy performance. Energy, 35(8), 3349–3363. https://doi.org/10.1016/j.energy.2010.04.021Chong, W. T., Fazlizan, A., Poh, S. C., Pan, K. C., Hew, W. P., & Hsiao, F. B. (2013). The design , simulation and testing of an urban vertical axis wind turbine with the omni-direction-guide-vane q. APPLIED ENERGY, 5–8. https://doi.org/10.1016/j.apenergy.2012.12.064Chong, W. T., Poh, S. C., Abdullah, N., Naghavi, M. S., & Pan, K. C. (2010). Vertical Axis Wind Turbine with Power-Augmentation-Guide-Vane for Urban High Rise Application 3 . Building integrated wind-solar hybrid energy generation system and rain water collector. (September), 1–6.Damak, a., Driss, Z., & Abid, M. S. (2013). Experimental investigation of helical Savonius rotor with a twist of 180?? Renewable Energy, 52, 136–142. https://doi.org/10.1016/j.renene.2012.10.043Hasan, M. H., Muzammil, W. K., Mahlia, T. M. I., Jannifar, A., & Hasanuddin, I. (2012). A review on the pattern of electricity generation and emission in Indonesia from 1987 to 2009. Renewable and Sustainable Energy Reviews, 16(5), 3206–3219. https://doi.org/10.1016/j.rser.2012.01.075Mohamed, M. H., Janiga, G., Pap, E., & Thévenin, D. (2010). Optimization of Savonius turbines using an obstacle shielding the returning blade. Renewable Energy, 35(11), 2618–2626. https://doi.org/10.1016/j.renene.2010.04.007Nobile, R., Vahdati, M., & Barlow, J. F. (2013). Unsteady flow simulation of a vertical axis wind turbine : a two-dimensional study. (July), 1–10.Pope, K., Rodrigues, V., Doyle, R., Tsopelas, a., Gravelsins, R., Naterer, G. F., & Tsang, E. (2010). Effects of stator vanes on power coefficients of a zephyr vertical axis wind turbine. Renewable Energy, 35(5), 1043–1051. https://doi.org/10.1016/j.renene.2009.10.012Ricci, R., Romagnoli, R., Montelpare, S., & Vitali, D. (2016). Experimental study on a Savonius wind rotor for street lighting systems q. Applied Energy, 161, 143–152. https://doi.org/10.1016/j.apenergy.2015.10.012Roy, S., & Saha, U. K. (2015). Wind tunnel experiments of a newly developed two-bladed Savonius-style wind turbine. Applied Energy, 137, 117–125. https://doi.org/10.1016/j.apenergy.2014.10.022Soo, K., Ik, J., Pan, J., & Ryu, K. (2015). Effects of end plates with various shapes and sizes on helical Savonius wind turbines. Renewable Energy, 79, 167–176. https://doi.org/10.1016/j.renene.2014.11.035Tartuferi, M., D’Alessandro, V., Montelpare, S., & Ricci, R. (2015). Enhancement of Savonius wind rotor aerodynamic performance: a computational study of new blade shapes and curtain systems. Energy, 79, 371–384. https://doi.org/10.1016/j.energy.2014.11.023Walker, S. L. (2011). Building mounted wind turbines and their suitability for the urban scale — A review of methods of estimating urban wind resource. Energy & Buildings, 43(8), 1852–1862. https://doi.org/10.1016/j.enbuild.2011.03.032
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Rudianto, Daniel. "RANCANG BANGUN TURBIN ANGIN SAVONIUS 200 WATT." Conference SENATIK STT Adisutjipto Yogyakarta 2 (November 15, 2016): 71. http://dx.doi.org/10.28989/senatik.v2i0.35.
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This study aimed to establish the type of Savonius wind turbines that capable of generating electric power of 200 Watts. This objective relates to Bantul District Government program which plans to build wind turbin generating electrical power (Pembangkit Listrik Tenaga Bayu, PLTB) 200 Watt as a backup power source for powering cooling fish caught by fishermen in the southern coast. Savonius Turbine chosen with consideration that it has simple construction so that the cost is not expensive, not depending on the direction of the wind, and is suitable for small power plants.Design of Savonius turbine blade has been completed, the turbine blade height 168 cm and a diameter of 55 cm. Blade turbine mounted on an arm along 55 cm from the turbine shaft and separate 120º. The turbine is supported by a 3-foot-tall turbines framework 2,5 m iron box 4 cm x 4 cm. The test simulated to determine the turbine rotation has been performed at varying wind speeds, i.e. 2 m /s, 4 m /s and 6 m /s.Based on test results, the turbine is capable of rotating an average of 54,2 rpm at a wind speed of 2 m /s; 86,8 rpm at a wind speed of 4 m /s; and 124,2 rpm at a wind speed of 6 m /s. These test results indicate that the Savonius turbines can be used to drive a generator producing the need of electrical energy
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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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Alaimo, Andrea, Alberto Milazzo, Flavio Trentacosti, and Antonio Esposito. "On the Effect of Slotted Blades on Savonius Wind Generator Performances by CFD Analysis." Advanced Materials Research 512-515 (May 2012): 747–53. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.747.
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In this paper a new bucket configuration for Savonius wind generator is proposed. With the aim to increase the effect of the overlap ratio RS on the wind turbine performances and to increase the amount of lift force able to produce torque and power, slotted blades are investigated by means of the Computational Fluid Dynamics analysis. The numerical analyses are performed by Comsol Multiphysics® and the results obtained for a Savonius wind turbine with overlap only are compared to numerical and experimental benchmarks. Parametric analyses are performed, for fixed overlap ratio, by varying the slot angle β and the results show that for low angle β the Savonius rotor exploits improved performance at low tip speed ratio λ, evidencing a better starting torque. This circumstance is confirmed by the static analyses performed on the slotted blades in order to investigate the starting characteristic of the proposed Savonius wing generator configuration.
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Puspitasari, Dewi, and Kaprawi Sahim. "Effect of Savonius blade height on the performance of a hybrid Darrieus-Savonius wind turbine." Journal of Mechanical Engineering and Sciences 13, no. 4 (December 30, 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.
Dissertations / Theses on the topic "Savonius wind turbina"
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Záviška, Radek. "Savoniova větrná turbína." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231799.
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The diploma thesis is focused on designer works of Savounius rotor for Raječko location. Finish of this design work is equipment, which will be used in this location as decentralized source of electrical energy. In thesis are written manufacturing processes as so as the process of design part including the calculation part, which is focused on characteristic quantity of Savonius rotor. Thesis is finished by econominal assessment of project.
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Previtero, Chiara. "Computational fluid dynamics analysis and experimental tests of a small vertical axis wind turbine: choice of design." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18259/.
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Il crescente fabbisogno energetico e la necessità di ridurre l'inquinamento atmosferico stanno spingendo la ricerca verso soluzioni alternative di produzione di energia. Una di queste potrebbe essere l'inserimento di turbine eoliche ad asse verticale (VAWT), come quella Savonius, nella generazione distribuita.
La Savonius ha un design semplice e può generare potenza anche a basse velocità del vento quindi, con l'obiettivo di aumentarne il coefficiente di potenza, sono state studiate delle pale con una forma alternativa a quella tradizionale semicilindrica.
Una volta selezionato il design con le migliori prestazioni in termini di coppia e coefficienti di potenza, questi parametri sono stati studiati in funzione degli angoli azimutali, del tip speed ratio (TSR) e del numero di Reynolds. Inoltre sono stati analizzati i campi di velocità e pressione nel dominio circostante la turbina eolica.
Tutte le indagini sono state eseguite con un'analisi fluidodinamica computazionale (CFD), realizzata con il software Star-CCM+, e considerando come dominio computazionale un cilindro avente le dimensioni di una galleria del vento.
Nonostante la potenza estraibile da questo prototipo di turbina eolica sia bassa a causa della piccola taglia, il coefficiente di potenza massimo, mediato su una rotazione, raggiunge il valore di 0.24 quando il TSR è pari a 0.85.
Quindi il nuovo aerogeneratore risulta avere un’efficienza maggiore di quella raggiunta dalla turbina Savonius avente pale con forma tradizionale e che è stata analizzata come confronto. In quest'ultimo caso, infatti, il coefficiente di potenza medio massimo è 0.22, quando il TSR è 0.75.
Il nuovo prototipo è anche stato costruito e testato nella galleria del vento in collaborazione con due studenti dell’”Ecole d’Ingénieurs Polytechnique de l’Université de Tours”: Maxime Collet e Romain Guehennec. E’ stato dimostrato che al crescere della velocità del vento, aumenta quasi linearmente la velocità di rotazione della turbina eolica.
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Chinchore, Asmita C. "Computational Study of Savonius Wind Turbine." Cleveland State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=csu1389795972.
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Du, Yingkang. "An Orthogonal Savonius-type Wind Turbine: Design and Experiments." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459510710.
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Pope, Kevin. "Performance assessment of transient behaviour of small wind turbines." Thesis, UOIT, 2009. http://hdl.handle.net/10155/28.
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Small wind turbine installations have a variety of potential uses, each with unique
performance demands and operating conditions. Many applications require that the
turbine is placed in wind conditions that are not ideal for optimum operation. Better
predictive techniques can improve wind turbine performance through improved control
strategies and enhanced designs. Conventional methods of wind power design and control
utilize an average power coefficient. In this thesis, various techniques to predict the
transient power coefficient of a wind turbine are developed. The operation of a Savonius
wind turbine is accurately represented, with a new model which considers the flow
distributions to predict the changes in power output at all rotor positions. Another model
is developed that represents the dynamics of a small horizontal wind turbine, including
the effect of transient wind conditions on rotor speed and acceleration. These can
supplement current methods to determine turbine placement, selection and categorization.
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Sundberg, Johanna, Martina Lundberg, Julia Solhed, and Aikaterini Manousidou. "Two-dimensional Study of Blade Profiles for a Savonius Wind Turbine." Thesis, Uppsala universitet, Elektricitetslära, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-412795.
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A Savonius wind turbine is a self-starting vertical axis rotor. It can be designed to be compact in size and also produces less noise which makes it suitable to integrate into urban spaces such as rooftops and sign-poles. These characteristics make it interesting from a sustainability point of view, especially when aiming to increase the decentralization of electricity production. This thesis aimed to investigate the aerodynamic performance of different two-bladed Savonius profiles by varying the blade arc angle and the overlap ratio. For evaluation, the dimensionless power coefficient and torque coefficient were investigated over different tip speed ratios. The study was conducted numerically with 2D simulations in Ansys Fluent. The partial differential equations describing the characteristics of the flow, including the flow turbulence effects, were solved with the Reynolds-average Navier Stokes in combination with the k-omega SST model. A validation was performed by comparing data from simulated and experimental tests of a semi-circular profile and a Benesh profile. The investigation of the blade arc angle and overlap ratio was performed on a Modified Bach profile. The profile with a blade arc angle of 130 degrees and an overlap ratio of 0.56 generated a maximal power coefficient of 0.267 at a tip speed ratio of 0.9. This blade configuration generated the best performance of all conducted simulations in this project. However, this project contained uncertainties since simulations can never be an exact description of reality. The project was also limited by the computational power available. Nevertheless, according to the conducted simulations, it was observed that a higher blade arc angle and a larger overlap ratio seem to generate higher efficiency.En Savonius vindturbin är en självstartande vertikalaxlad rotor som kan utformas i en kompakt design samtidigt som den producerar mindre oljud än horisontalaxlade vindkraftverk. Dagens hållbarhetssträvan i kombination med Savonius turbinens karakteristiska egenskaper gör den till ett potentiellt starkt vertyg för vindenergi. Då den kan placeras på exempelvis hustak eller skyltstolpar, utan att störa närliggande omgivning, finns det många möjliga sätt att implementera och integrera den i samhällets infrastruktur. Målet med detta projekt var att undersöka den aerodynamiska prestationen för Savoniusturbiner med två blad genom att variera bladvinkeln och överlappningsförhållandet. För att jämföra de olika profilerna användes den dimensionslösa effektkoefficienten och momentkoefficienten. Dessa koefficienter beräknades i förhållande till löptalet. Studien utfördes numeriskt med 2D-simuleringar i Ansys Fluent. De partiella differentialekvationerna som beskriver flödets egenskaper, inkluderat turbulenseffekterna, löstes med Reynolds-average Navier Stokes i kombination med k-ω SST modellen. En validering utfördes genom att jämföra data med simulerade och experimentella värden av en Semi-circular profil och en Benesh profil. Studien av bladvinkel och överlappningsförhållandet utgick från en Modified Bach profil. Den mest effektiva profilen hade en bladvinkel av 130 grader och ett överlappsförhållande på 0,56. Den genererade en maximal effektkoefficient av 0,267 vid löptal 0,9. Projektet innehöll en del osäkerheter då simuleringar aldrig kan beskriva verkligheten till fullo. Den tillgängliga beräkningskapaciteten begränsade även projektet ytterligare. Trots vissa begränsningar, visar ändå utförda simuleringar att ökad bladvinkel och ökat överlappningsförhållande genererar högre effekt.
This project was conducted within Stand up for wind and Stand up for energy.
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Fernando, Mahamarakkalage Saman Udaya Kumar. "On the performance and wake aerodynamics of the Savonius wind turbine." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27299.
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The objective of the thesis is to establish methodology for development of a wind turbine, simple in design and easy to maintain, for possible application in developing countries. To that end the Savonius configuration is analyzed in detail both experimentally and analytically to lay a sound foundation for its performance evaluation. Following a brief review of relevant significant contributions in the field (Chapter I), an extensive wind tunnel test-program using scale models is described which assesses the relative influence of system parameters such as blade geometry, gap-size, overlap, aspect ratio, Reynolds number, blockage, etc., on the rotor output. The parametric study leads to an optimum configuration with an increase in efficiency by around 100% compared to the reported efficiency of ≈ 12 — 15%. Of particular interest is the blockage correction procedure which is vital for application of the wind tunnel results to a prototype design, and facilitates comparison of data obtained by investigators using different models and test facilities.
With the design and performance results in hand, Chapters III — VI focus attention on analytical approaches to complement the test procedure. Using the concept of a central vortex, substantiated by a flow visualization study, Chapter III develops a semi-empirical approach to predict the rotor performance using measured stationary blade pressure data. The objective here is to provide a simple yet reliable design tool which can replace dynamical testing with a significant saving in time, effort, and cost. The simple approach promises to be quite effective in predicting the rotor performance, even in the presence of blockage, and should prove useful at least in the preliminary design stages.
Chapter IV describes in detail a relatively more sophisticated and rigorous Boundary Element Approach using the Discrete Vortex Model. The method attempts to represent the complex unsteady flow field with separating shear layers in a realistic fashion consistent with the available computational tools. Important steps in the numerical analysis of this challenging problem are discussed at some length in Chapter V and a performance evaluation algorithm established. Of considerable importance is the effect of computational parameters such as number of elements representing the rotor blade, time-step size, location of the nascent vortices, etc., on the accuracy of results and the associated cost. Results obtained using the Discrete Vortex Model are presented and discussed in Chapter VI, for both stationary as well as rotating Savonius configurations. A detailed parametric study provides fundamental information concerning the starting and dynamic torque time histories, power coefficient, evolution of the wake, Strouhal number, etc. A comparison with the flow visualization and wind tunnel test data (Chapter II) shows remarkable correlation suggesting considerable promise for the approach. The thesis ends with concluding remarks and a few suggestions concerning possible
future research in the area.Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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Akwa, João Vicente. "Análise aerodinâmica de turbinas eólicas Savonius empregando dinâmica dos fluidos computacional." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/26532.
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Neste trabalho, são apresentados a discussão de conceitos fundamentais, a metodologia e os resultados de simulações numéricas baseadas no Método de Volumes Finitos do escoamento de ar sobre algumas opções de configurações de turbinas eólicas do tipo Savonius, com e sem estatores, em operação e, também, em condições estáticas, como as encontradas nas partidas das mesmas. Comparam-se os resultados para diferentes domínios computacionais, bem como alternativas de discretização espacial e temporal, visando apresentar a influência desses sobre os valores obtidos e estabelecer os parâmetros computacionais adequados para a análise das turbinas em estudo. Nas simulações numéricas, desenvolvidas empregando o programa comercial Star-CCM+, a equação da continuidade e as equações de Navier-Stokes com médias de Reynolds são resolvidas, juntamente com as equações de um modelo de turbulência adequado, que é escolhido, para a obtenção dos campos de pressão e de velocidade do escoamento. Emprega-se um domínio contendo uma região com malha móvel, na qual o rotor é inserido. A cada simulação, a velocidade angular da região de malha móvel é especificada de maneira a variar a razão de velocidade de ponta do rotor. Através da integração das forças ocasionadas devido aos gradientes de pressão e das forças originadas pelo atrito viscoso sobre as pás do rotor eólico, obtém-se o coeficiente de torque em cada simulação. O torque e as forças atuantes no rotor também são obtidos de forma semelhante. Com esses dados, outros parâmetros como a potência e o coeficiente de potência são obtidos. Análises dos principais parâmetros de desempenho do rotor Savonius são realizadas e indicam uma boa concordância com resultados experimentais e de simulações numéricas realizadas por outros autores. Os resultados obtidos nas simulações apresentaram-se bastante representativos do fenômeno analisado.This research work presents a discussion of basic concepts, the methodology and the results of numerical simulations based on Finite Volume Method for the air flow through some configuration options of the Savonius wind turbines, with and without stators, in operation, and also under static conditions, such as those found in the self starting. Results for different computational domains, as well as alternative spatial and temporal discretization are compared, in order to present the influence of these on the obtained values from the computational analysis of the turbines in study. In the numerical simulations, performed using the commercial software Star-CCM+, the equation of continuity and the Reynolds Averaged Navier-Stokes Equations were solved, together with the equations of a turbulence model appropriate, which is chosen, so that the fields of pressure and velocity could be found. It was used, in the calculations, a domain containing a region with a moving mesh, in which the rotor was inserted. In each simulation, the rotational rate of the moving mesh region was specified so as to vary the tip speed ratio of rotor. Through the integration of the forces arising due to the pressure gradients and the forces originated from the viscous friction on the wind rotor blades, the moment coefficient could be obtained in each simulation. The moment and forces acting on the rotor were also obtained similarly. With these data, other parameters such as the power and the power coefficient of the wind rotor could be obtained. Analysis of the principals performance parameters of the Savonius wind rotor were performed and indicated a good agreement with experimental results and numerical simulations performed by other authors. The simulations results are quite representative of the phenomenon analyzed.
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Kothe, Leonardo Brito. "Estudo comparativo experimental e numérico sobre o desempenho de turbinas savonius helicoidal e de duplo-estágio." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/141901.
Full textAbstract:
O presente trabalho apresenta um estudo numérico e experimental sobre o desempenho aerodinâmico de turbinas eólicas de eixo vertical envolvendo rotores Savonius convencional de duplo-estágio e helicoidal. O estudo experimental é realizado no Túnel Aerodinâmico Professor Debi Pada Sadhu, do Laboratório de Mecânica dos Fluidos da UFRGS. As simulações numéricas são realizadas com o software Fluent/ANSYS utilizando o Método dos Volumes Finitos. São comparados os coeficientes de torque estático e dinâmico, o coeficiente de potência, além de uma análise aerodinâmica das duas turbinas. As medições são realizadas empregando Tubos de Pitot, um torquímetro estático digital e um torquímetro simples construído para a medição do torque dinâmico. As turbinas são fabricadas através da técnica de prototipagem 3D, com uma semelhança de dimensões e parâmetros. As soluções numéricas são resolvidas através da equação da continuidade, das equações de Navier-Stokes com médias de Reynolds (RANS) e pelo modelo de turbulência k-ω SST. A qualidade da malha utilizada é avaliada através do método de Índice de Convergência de Malha (GCI), para três diferentes tamanhos de malha. São feitas análises dos rotores na forma estática para diferentes ângulos de incidência e com a turbina em rotação são feitas análises para diferentes razões de velocidades de ponta de pá (λ). Resultados demonstram que a turbina helicoidal apresenta um coeficiente de torque positivo para todos os ângulos do rotor, assim como a turbina convencional de dois estágios. O coeficiente de torque dinâmico da turbina helicoidal é superior ao da turbina de duplo-estágio para a maioria dos casos, e também apresenta menor oscilação de torque ao longo de cada rotação. Por consequência, o coeficiente de potência do rotor helicoidal também se tornou superior, com um valor máximo encontrado na ordem de 11,8% para um λ de 0,65 no caso experimental, e de 8,4% para o mesmo λ no caso numérico, quando comparado com o rotor de duplo-estágio. Os erros relativos entre as simulações numéricas e os resultados experimentais estão entre 2,16% e 13,4%. Uma estimativa de potência gerada é feita para ambos os casos, para uma razão de velocidade de ponta de 0,65, onde a turbina helicoidal apresenta melhores resultados em relação ao rotor de duplo-estágio, na ordem de 13,6% para uma velocidade de 10,4 m/s.This paper presents a numerical and experimental study of vertical axis wind turbine performance comparison involving two-stage and helical Savonius rotors. The experimental study is conducted in the Aerodynamic Tunnel Professor Debi Pada Sadhu at the Fluid Mechanics Laboratory of the UFRGS. The numerical simulations are performed with the Fluent/ANSYS software using the Finite Volumes Method. The static and dynamic torque coefficients, the power coefficients, and an aerodynamic analysis of the two turbines are compared. Measurements are made using Pitot tubes, a digital static torque wrench and a simple wrench constructed for the dynamic torque measurement. The aerodynamics rotors are manufactured by 3D prototyping technique with similar dimensions and parameters. Numerical solutions are solved by the continuity equation, the Reynolds Averaged Navier-Stokes (RANS) equations and the turbulence model k-ω SST. The quality of the mesh used is evaluated used the Grid Convergence Index (GCI) method, for three different mesh sizes. The rotors analyzes are made in static form for different angles of incidence and for the rotating turbine analyzes are made for differents tip speed ratio (λ). Results show that the helical turbine has a positive static torque coefficient for any rotor angles, as well as conventional two-stage turbine. The dynamic torque coefficient of the helical turbine is higher than the two-stage turbine for most cases and also shows less torque variation along each rotation. Consequently, the power coefficient of the helical rotor also become higher, with a maximum value found on the order of 11.8% for a λ of 0.65 in the experimental case, and 8.4% for the same λ number when compared with the two-stage rotor. The relative errors between the numerical simulations and the experimental results are between 2.16% and 13.4%. A generated power estimate is made for both cases, for a tip speed ratio of 0.65, where the helical turbine provides better results compared to two-stage rotor in order of 13.6% for a velocity of 10.4 m/s.
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Achilli, Isabella. "Study of a conventional Savonius rotor and optimization of a helical prototype." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15339/.
Full textAbstract:
The aim of this Master Thesis is to study numerically the aerodynamic performance of two small examples of horizontal axis domestic wind turbines: a conventional Savonius rotor, designed and built by a group of students of the Polytech of Tours (France), and its optimization, a helical Savonius rotor. In the first research project, the exploration is conducted even experimentally, testing the turbine in a wind tunnel present in the Polytech.
The numerical investigation is carried out by the use of a software based on Computational Fluid Dynamics named Star CCM+, which helps studying the main fluid dynamics aspects as flow velocity, pressure and coefficients of performance.
The second project consists in a helical Savonius rotor: according to the literature, the helical shape, comparing with the conventional Savonius rotor, usually shows better performances. After the 3D design on Catia, the turbine was printed using the 3D printer, on a reduced scale. CFD simulations allow to study the fluid dynamic features.
Afterwards, thanks to a comparison between the two Savonius models, the performance enhancement of the new one is shown, together with a practical understanding gained of the parameters influencing aerodynamics the most.
By means of the simulations, the helical rotor presents a power coefficient of 10%, which is better than the one of the conventional rotor, found at 7% for the same Tip Speed Ratio. Consequently, even the power produced by the new turbine, resulted to be better than the conventional windmill.
Book chapters on the topic "Savonius wind turbina"
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Dosaev, Marat, Liubov Klimina, Anna Masterova, Vitaly Samsonov, and Yury Selyutskiy. "Counter-Rotating Savonius Wind Turbine." In New Trends in Mechanism and Machine Science, 413–20. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55061-5_47.
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Dhamotharan, Vishaal, Ranjana Meena, Piyush Jadhav, Palaniappan Ramu, and K. Arul Prakash. "Robust Design of Savonius Wind Turbine." In Renewable Energy in the Service of Mankind Vol I, 913–23. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17777-9_82.
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Meziane, Mohamed, Mustapha Faqir, Elhachmi Essadiqi, and Mohamad Fathi Ghanameh. "Numerical Investigation of Hybrid Darrieus-Savonius Wind Turbine Performance." In Advances in Intelligent Systems and Computing, 466–74. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36671-1_41.
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Dosaev, Marat, Margarita Ishkhanyan, Liubov Klimina, Anna Masterova, and Yury Selyutskiy. "A Wheeled Vehicle Driven by a Savonius–Magnus Wind Turbine." In ROMANSY 23 - Robot Design, Dynamics and Control, 380–86. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58380-4_46.
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Tantia, Paarth, Pratyush Singh, Punit Prakash, and Nishant Mishra. "Numerical Analysis of Savonius Vertical Axis Wind Turbine with Dimpled Blades." In Lecture Notes in Mechanical Engineering, 209–23. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4018-3_20.
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Brito Kothe, L., and A. Prisco Petry. "Numerical and Experimental Comparison of Performance of Two Stage and Helical Savonius Wind Turbines." In Wind Energy Exploitation in Urban Environment, 189–204. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74944-0_13.
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Lates, Mihai, and Radu Velicu. "CFD Analysis and Theoretical Modelling of Multiblade Small Savonius Wind Turbines." In Springer Proceedings in Energy, 403–15. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09707-7_30.
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Krysinski, Tomasz, Zbigniew Bulinski, and Andrzej J. Nowak. "Numerical Modelling of a Savonius Wind Turbine Using the URANS Turbulence Modelling Approach." In Recent Advances in CFD for Wind and Tidal Offshore Turbines, 105–15. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11887-7_10.
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Hasan Fayaz, S. M., Uditya Tyagi, Apurva Jain, and Nishant Mishra. "Performance Enhancement of a Savonius Vertical Axis Wind Turbine with Bio-Inspired Design Modifications." In Lecture Notes in Mechanical Engineering, 449–57. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4488-0_38.
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Alli, Mahammad Sehzad, and S. Jayavel. "Numerical Study on Performance of Savonius-Type Vertical-Axis Wind Turbine, with and Without Omnidirectional Guide Vane." In Numerical Heat Transfer and Fluid Flow, 449–55. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1903-7_52.
Full textConference papers on the topic "Savonius wind turbina"
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Sarma, Neelam K., Agnimitra Biswas, and Rahul D. Misra. "Comparative Assessment of Savonius Water Turbine With Conventional Savonius Wind Turbine." In ASME 2019 Gas Turbine India Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gtindia2019-2459.
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Abstract Wind turbine has gained a keen interest in the field of research but its low efficiency due to low working fluid density triggers the need for upgradation. However, this technology will get a boost if the factor of low density fluid is eradicated. This paper is intended towards the study of performance of the same design of Savonius wind turbine when operated in high density water. The density of water is approximately 1000 times more than air. In the present study, the performance of a two bladed Savonius wind turbine and a Savonius water turbine have been analyzed both experimentally and with the aid of Computational Fluid Dynamics (CFD) using Ansys 19.0, keeping the maximum power content (Pmax) of the fluid-stream constant. Coefficient of power (Cp) is one of the deciding factors for superiority of the turbines one over the other. For the study, three cases of power contents viz. 0.61 W, 6.2 W and 16.45 W have been considered. The results obtained suggest that the Savonius water turbine with the highest Cp value of 0.343 is dominant over Savonius wind turbine. The effects of tip speed ratio and Non-dimensional factor (γ) on performance of both the turbine kinds have also been studied.
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Manne, Varun Kumar Reddy, and Hong Zhou. "Designing and Analyzing Savonius Wind Turbines." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10761.
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Abstract Savonius wind turbines are drag-type vertical axis wind turbines. Their blades experience less drag while moving against the wind flow and more drag while moving in the wind direction. The drag difference rotates Savonius wind turbines and produces electrical power. Savonius wind turbines can catch wind from any direction. No yaw motion mechanism is needed for them to be pointed in the wind direction. Savonius wind turbines have simple structures and are convenient to install and maintain. They can operate on low wind speed and have good starting characteristics. Compared with horizontal axis wind turbines and lift-type vertical axis wind turbines such as Darrieus and Giromill wind turbines, Savonius wind turbines have relatively low power conversion efficiency. This is because of their drag-type nature which generates positive and negative torque on their advancing and returning blades, respectively. Savonius wind turbines are suitable for locations where power conversion efficiency can be compromised for the sake of low cost and high reliability. One major drawback from Savonius wind turbines is the negative static torque which lowers their self-starting ability. Although the negative static torque of Savonius wind turbines can be mitigated by adding additional components such as curtains, nozzles and ducts to them, these additional components make them complex and lose omnidirectional performance. In this paper, Savonius wind turbines are designed based on their geometric parameters to remove their negative static torque and improve their performance. Savonius wind turbines with different numbers of blades and other geometric parameters are designed, analyzed and simulated.
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Homzah, Ozkar F., Tri Widagdo, Mardiana, Ibnu Asrofi, and Destra A. Pratama. "Prototype of Small Savonius Wind Turbine." In 4th Forum in Research, Science, and Technology (FIRST-T1-T2-2020). Paris, France: Atlantis Press, 2021. http://dx.doi.org/10.2991/ahe.k.210205.037.
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Rashidi, Majid, Jaikrishnan R. Kadambi, and Asmita Chinchore. "Computational Study of Savonius Wind Turbines." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-39595.
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This work presents a computational study of a two-blade and a three-blade Savonius vertical axis wind turbines. The two-blade turbine was considered to be oriented at 0, 45, 90, and 135 degrees in reference to the direction of the prevailing wind. For the three-blade turbine, the orientations taken into account were 0, 30, 60, and 90 degrees in reference to the direction of the prevailing wind. The basic aim of this work was to study how the two designs are different from each other in terms of the forces acting on their blades. The computational simulations considered the turbines to be subjected to constant wind velocities of 5, 10, 20, and 30 m/s. Computational Fluid Dynamics (CFD) analyses were conducted for every case to find out the forces acting on the turbine blades for each orientation. All cases were run using “transition-SST” flow model and the turbine blades were meshed using ‘Quadrilateral Pave’ meshing scheme. Maximum change in pressure on the turbine blade occurs when the two-blade turbine is perpendicular to direction of the prevailing wind, i.e. at 90 degree. On the other hand, when three-blade turbine is at 60 degree orientation, maximum change is pressure occurs on the turbine blade. For the dimensions selected in this study (each blade having a radius of 0.3 m and height of 0.6 m) the maximum net forces on the two-blade turbine was calculated to be 298 N, while this value was 210 N on the three-blade turbine.
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rech, charles, Pericles Balafa, and Simone Venturini. "AERATION SYSTEM POWERED BY SAVONIUS WIND TURBINE." In 18th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2020. http://dx.doi.org/10.26678/abcm.encit2020.cit20-0158.
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Hesami, Ali, and Amir H. Nikseresht. "Performance Enhancements of Savonius Wind Turbine using a Hybrid Augmentation System." In 2021 7th Iran Wind Energy Conference (IWEC). IEEE, 2021. http://dx.doi.org/10.1109/iwec52400.2021.9466964.
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Ibrahim, Ahmed, and Ahmed M. R. Elbaz. "Investigating Efficient Clusters of Savonius Wind Turbines." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75405.
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The wake effect is the biggest challenge when locating downwind turbines in wind farms which imposes large separation distances between turbines. In the present work, CFD simulations are presented to study possible configurations of wind farms of Savonius wind turbines. The farm is composed by in steps, starting from two-turbine configuration, adding one turbine until reaching a cluster of closely set ten rotors with an average power coefficient of 0.225. This value is very close to the single rotor’s power coefficient. The power density of the cluster is 7.55 W/m2 which is much higher than similar ten turbines located far apart to avoid wake effect. The maximum Cp of a downstream rotor in the cluster reached 0.323 which is about 40% higher than the single rotor. The adopted philosophy for placing downstream rotors is locating the rotor’s returning bucket in the low velocity region of the wake of the upstream rotor to get the least negative torque while the advancing bucket is located at the high velocity region getting higher positive torque which increases the performance. After that, two crosswind clusters are added to increase the power generated. The predicted average power coefficient for the 30 rotors farm is 0.246 which is higher than a similar isolated turbine. The increase of the Cp occurs due to the positive interactions between the clusters. The highest Cp in the farm rotors is found to be 0.411 which is higher than the single rotor’s Cp by 78%. The farm also provides a high power-density of 4.65 W/m2 which is 5 times higher than a farm with the same number of turbines located far apart.
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Rahman, Mosfequr, Khandakar N. Morshed, Jeffery Lewis, and Mark Fuller. "Experimental and Numerical Investigations on Drag and Torque Characteristics of Three-Bladed Savonius Wind Turbine." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10838.
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With the growing demand of energy worldwide, conventional energy is becoming more and more scarce and expensive. The United States is already facing an energy crunch as the fuel price soars. Therefore, there is an obvious need for alternative sources of energy—perhaps more than ever. Wind is among the most popular and fastest-growing forms of electricity generation in the world, which is pollution free and available almost at any time of the day, especially in the coastal regions. The main attraction of the vertical-axis wind turbine is its manufacturing simplicity compared to that of the horizontal-axis wind turbine. Among all different vertical axis wind turbines, Savonius wind turbine is the simplest one. Operation of the Savonius wind turbine is based on the difference of the drag force on its semi-spherical blades, depending on whether the wind is striking the convex or the concave part of the blades. The advantage of this type of wind turbine is its good self-starting and wind directional independence characteristic. It, however, has a relatively lower efficiency in comparison with the lift type vertical-axis wind turbines. Due to its simple design and low construction cost, Savonius rotors are primarily used for water pumping and wind power on a small scale. The main objective of this ongoing research work is to improve the aerodynamic performance of vertical axis Savonius wind turbine. Wind tunnel investigation has been performed on aerodynamic characteristics, such as drag coefficients, and static torque coefficient of three-bladed Savonius rotor model. Also the computational fluid dynamics (CFD) simulation has been performed using FLUENT software to analyze the static rotor aerodynamics such as drag coefficients and torque coefficient, and these results are compared with the corresponding experimental results for verification.
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Talukdar, Parag K., Vinayak Kulkarni, and Ujjwal K. Saha. "Performance Characteristics of Vertical-Axis Off-Shore Savonius Wind and Savonius Hydrokinetic Turbines." In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-78497.
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The rise in energy demand, climate change and depletion of fossil fuel, encourages the researchers to find a solution to the scarcity of clean energy. Therefore, the extraction of energy from renewable energy sources has become a topic of interest in the past few decades across the globe. Thus, harvesting the offshore wind and hydro energy and converting it to electrical power using various electromechanical devices has been a challenge. In this context, the vertical-axis Savonius wind and Savonius hydrokinetic turbines appear to be promising concept for energy conversion because of their good self-starting capability and simplicity in design. The present study attempts to characterize the performances of a Savonius wind turbine (SWT) and a Savonius hydrokinetic turbine (SHT) under identical input flow conditions. In order to characterize their performances, the SWT is tested in a low-speed wind tunnel with closed test section whereas the SHT is tested in an open channel flume. In each case, the torque and power coefficients are estimated at different mechanical loading conditions. It is observed that the SWT and SHT demonstrate peak power coefficients of 0.25 and 0.28 respectively for the same input power. However, the SWT is found to operate over a slightly wider range of tip-speed ratios than the SHT before the onset of stall. Finally, the computational study using ANSYS 14.5 has been carried out to evaluate the flow physics of the turbine at various azimuthal positions.
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Hosseini, Arian, and Navid Goudarzi. "CFD and Control Analysis of a Smart Hybrid Vertical Axis Wind Turbine." In ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/power2018-7488.
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Wind energy has become a dominant source of renewable energy during the past decade. Current hybrid wind turbines are primarily designed and manufactured based on a combination of aerodynamic properties for both Darrieus and Savonius turbines. In this work, the aerodynamic performance characteristics of a smart vertical axis wind turbine (VAWT) with an electro-magnetic switch mechanism for dis-/engagement mechanism is studied analytically and numerically. The proposed novel VAWT offers a high start-up torque by a Savonius turbine and high power coefficient values by a Darrieus turbine. The switch mechanism can further improve the system efficiency by running the turbines together or independently. The proposed hybrid VAWT was modeled as a combined Savonius-type Bach turbine and a 3-bladed H-Darrieus turbine. The hybrid turbine has a self-startup feature and reaches a coefficient of power (Cp) of over 40%. The turbine is also estimated to cover a wide operational range up to TSR 6. The follow on research phases of the project include studying the proposed smart VAWT experimentally and validating the results with those obtained through computational analysis.