Gotowe bibliografie tematyczne / Savonius rotor

Gotowa bibliografia na temat „Savonius rotor”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 19 lutego 2023

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Artykuły w czasopismach na temat "Savonius rotor"

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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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Cheng, Chao Yuan, i Xiao Qing Wei. "The Innovative Design and Simulation Analysis of Small Savonius Wind Turbine". Advanced Materials Research 591-593 (listopad 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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Freitas, Felipe Augusto Lustosa Meireles, Ronaldo Barcelos e. Silva, Leonardo Da Rosa Schmidt, Silvana Maldaner i Lucinéia Fabris. "Análise da potência mecânica de rotores de Savonius de mesma razão de aspecto". Ciência e Natura 42 (7.02.2020): 33. http://dx.doi.org/10.5902/2179460x40635.

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An experimental performance study of Savonius small rotors is performed in this work. Two Savonius prototypes, two blades and the same aspect ratio, were constructed from vinyl polychloride and use different air flow. Experimental tests allowed the rotation speed of each rotor to be determined for different air flows. It is important to note that the average angular velocity of the smaller rotor is approximately fifty percent higher than the larger rotor. At the same time, the absorption torque on the rotor shaft was measured and the mechanical power of each Savonius wind turbine prototype was estimated. The main result was that wind turbines of the same aspect ratio have different performances.
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Doerffer, Krzysztof, Janusz Telega, Piotr Doerffer, Paulina Hercel i Andrzej Tomporowski. "Dependence of Power Characteristics on Savonius Rotor Segmentation". Energies 14, nr 10 (18.05.2021): 2912. http://dx.doi.org/10.3390/en14102912.

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Savonius rotors are large and heavy because they use drag force for propulsion. This leads to a larger investment in comparison to horizontal axis wind turbine (HAWT) rotors using lift forces. A simple construction of the Savonius rotor is preferred to reduce the production effort. Therefore, it is proposed here to use single-segment rotors of high elongation. Nevertheless, this rotor type must be compared with a multi-segment rotor to prove that the simplification does not deteriorate the effectiveness. The number of segments affects the aerodynamic performance of the rotor, however, the results shown in the literature are inconsistent. The paper presents a new observation that the relation between the effectiveness of single- and multi-segment rotors depends on the wind velocity. A single-segment rotor becomes significantly more effective than a four-segment rotor at low wind speeds. At high wind speeds, the effectiveness of both rotors becomes similar.
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Song, Xiao Wen, Kai Yuan Cao, Zhong Rui Chen i Ke Shen. "Design Optimization of Savonius Rotors: An Overview". Applied Mechanics and Materials 58-60 (czerwiec 2011): 827–33. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.827.

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Since the Savonius rotor has a low starting torque and is adaptable for wind in various directions, it has received great attention in the past decades. In this paper, we present an overview of the state of the art in Savonius rotor design, according to three general strategies of design optimization: 1) Optimizing Savonius rotor structural parameters including overlap ratio, aspect ratio of the rotor, twist angle, Reynolds number, and the shaft of the rotor; 2)Adopting multi-level Savonius rotor or combining Savonius rotor with other type rotor to avoid negative torque of the rotor and improve both efficiency and starting torque; 3)Adding auxiliary devices such as curtain or guide-box to decrease the negative torque. We conclude with a discussion of the advantages and challenges associated with development of this promising technology.
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Etemadeasl, Vahid, Rasool Esmaelnajad, Farzad F. Dizaji i Babak Farzaneh. "A novel configuration for improving the aerodynamic performance of Savonius rotors". Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 233, nr 6 (17.12.2018): 751–61. http://dx.doi.org/10.1177/0957650918818968.

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In this paper, a new configuration is proposed for Savonius rotors by installing two Counter-Rotating Savonius Rotors together and adding a V-shaped shield. For evaluating the performance of this type of turbine, turbulent unsteady flow around the rotor is simulated using ANSYS-Fluent 16.0 software. Numerical results of the torque and power coefficients of the turbine show a significant improvement in the aerodynamic performance compared to a single Savonius rotor. Effects of the V-shaped shield angle and distance from the rotors on the aerodynamic performance of the turbine are studied numerically. Analyzing the results show that in a design with a shield angle of 90° and with a shield distance of L = 1 D power coefficient increases by 80%.
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Gupta, Rajat, Bachu Deb i R. D. Misra. "Performance Analysis of a Helical Savonius Rotor with Shaft at 45° Twist Angle Using CFD". Mechanical Engineering Research 3, nr 1 (1.03.2013): 118. http://dx.doi.org/10.5539/mer.v3n1p118.

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Helical Savonius rotor is considered to be superior to conventional Savonius rotor in terms of higher power coefficient (Cp) and better starting characteristic. However studies related to helical Savonius rotors is few. In view of this, in this paper, the performance of a helical Savonius rotor with shaft at 45° bucket twist angle for one complete cycle of rotation was analyzed using Computational Fluid Dynamics. A two-bucket helical Savonius rotor with shaft was designed using GAMBIT, having a height of 60 cm and diameter of 17 cm with 45° bucket twist angle. A three dimensional Computational Fluid Dynamics analysis using Fluent package was done to predict the performance of the rotor. Standard k-? turbulence model with second order upwind discretization scheme and standard wall condition was used. Grid independence test was also conducted to have the best meshing accuracy. Power coefficients (Cp) of the rotor at different tip speed ratios were evaluated for rotor angle variation from 0° to 180°. Cp at each rotor angle increased with increase of tip speed ratio up to an optimum tip speed ratio, but then decreased even if tip speed ratio was further increased. Moreover, the effect of rotor angle on Cp in a complete cycle of rotation was analyzed. Cp was found to be positive at all rotor angles, and higher values of Cp were obtained at rotor angles namely 45°, 90°, 225° and 270°, which would contribute maximum power production by the rotor. In addition to these, flow physics of the rotor was studied using tangential velocity plots w.r.t. rotor angle and path lines across the rotor. It was found that at 45°, 90° and 135° rotor angles, maximum concentration of the path lines near the tip of the blades in the upstream and downstream side of the rotor had occurred, which would be responsible for generation of maximum power coefficient in its clockwise rotation.
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Tang, Zhi Peng, Ying Xue Yao, Liang Zhou i Q. Yao. "Optimal Design of a New Type of Savonius Rotor Using Simulation Analysis". Key Engineering Materials 499 (styczeń 2012): 120–25. http://dx.doi.org/10.4028/www.scientific.net/kem.499.120.

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In order to enhance the efficiency of the Savonius rotor, this paper designs a new type of Savonius rotor with a rectifier. By using Computational Fluid Dynamics software to simulate and optimize the various parameters which affect the efficiency of the rotor. The sliding mesh method is applied here. The Cp-λ curves of wind turbine with different structural parameters are obtained after numerical simulation of flow field. On this basis, this paper gets the optimal structural parameters. And the results indicated that this new type of Savonius rotor has great improvement of efficiency compared with the traditional Savonius-type rotor.
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Shishkin, Nikolai, i Roman Il’in. "Experimental determination of the energy efficiency of rotors of vertical-axis wind turbines for autonomous power supply on land and at sea". MATEC Web of Conferences 245 (2018): 06016. http://dx.doi.org/10.1051/matecconf/201824506016.

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For the first time, experimental studies have been performed to assess the effect of flaps with triangular elements on the operation of the N-Darrieus and Savonius rotors. It has been established that the rotational speed of the original N-Darrieus and Savonius rotors having blades with flaps is greater than the rotation frequency of the N-Darrieus and Savonius rotors of the known construction by 18%, and the power factors of the N-Darrieus and Savonius rotors are for 17% and 19% more. Optimization of the geometrical parameters of the blades can lead to an increase in the power factor of the N-Darrieus rotor up to a value of 0.72, which is higher than the maximum possible value of 0.45 for the horizontal axis wind turbine. It is advisable to aggregate N-Darrieus rotors with Savonius rotors having a large starting torque. The upgraded N-Darrieus and Savonius rotors, as well as the combined rotors based on them, can be used in power supply systems for various objects on land and at sea.
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Sineglazov, Victor, i Oleksandr Stanislavchuk. "Automation Disign of Hybrid Vertical-axial Rotors". Electronics and Control Systems 4, nr 70 (1.04.2022): 44–50. http://dx.doi.org/10.18372/1990-5548.70.16755.

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

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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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Silva, André Filipe Matos da Cruz. "Desempenho de um Rotor de Savonius: avaliação experimental". Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/22250.

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Mestrado em Engenharia Mecânica
A energia eólica é atualmente uma fonte de energia renovável utilizada pelo homem através de diferentes mecanismos. O rotor de Savonius, uma turbina de eixo vertical, é uma opção para produção de energia em pequena escala. A produção e venda de energia elétrica à rede pública, fruto de fontes renováveis, é hoje em dia uma opção enquadrada na nossa legislação. Com base no potencial das características dos rotores de Savonius analisou-se experimentalmente quatro configurações diferentes com o intuito de comparar as suas performances, sendo que a configuração de centro aberto e pás fechadas obteve os melhores resultados ao nível de produção de energia eólica.
Wind energy is currently a renewable energy source used by man through different mechanisms. The Savonius rotor, a vertical-axis turbine, is an option for small-scale power production. The production and sale of electricity to the public grid, by renewable sources, is nowadays an option framed in our legislation. Based on the potential of the characteristics of the Savonius rotors, four different configurations were experimentally analyzed in order to compare their performances, being that open-center and closed-bladed configuration obtaining the best results of wind energy production.
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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/.

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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.
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Roth, Neal Joseph. "A prototype design and performance of the Savonius rotor based irrigation system". Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25106.

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Important stages in the development of a wind energy operated irrigation system, which is simple in design and easy to maintain, are described from model tests in wind tunnels through to a prototype prepared for field tests. The attention is focussed on gross features of the protoype including the blade geometry and aspect ratio; mast, sleeve and bearing assemblies; braking system and a load matching concept. Described towards the end are the field test arrangements of the prototype and associated instrumentation. Even according to the most conservative estimate, the prototype tests suggest that the windmill should be able to deliver around 3000 liters of water per day (eight hours of wind) to a head of 5 m in a 24 km/h wind.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate
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Klečka, Jiří. "Větrná elektrárna se Savoniovým rotorem pro výrobu elektrické energie". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217858.

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Using of wind energy belongs to one of the fastest developing segments in the power production from renewable resources, which also relates to new studies and development of different types of power stations and brings new ideas to small wind sources spheres too. Savonius rotor is included in these spheres as well. This thesis deals with a complete design, realization and trial measurement of single-step Savonius rotor model. Introduction part treats of basic division and rotor utilization. Design part includes the design as well rotor graphical documentation. In the following part there is data evaluation, which leads to comparison with theoretical calculations. The final part includes an examination of possible utilization of Savonius rotor for generation of electricity.
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Hořava, Pavel. "Simulace malé větrné elektrárny se Savoniovým-Darrieovým rotorem". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220933.

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This master‘s thesis deals with the simulation of small wind power plant with Savonius-Darrieus rotor. On the base of the actuator disk theory the performance of modeled power plant is predicted in theoretical part and the power coefficient as well. The process of designing the wind model is also described in this theoretical part. The practical part of this thesis is dedicated to the creating a model of DS300 vertical axis hybrid wind turbine in Matlab/Simulink. This model was used to generating of the power curve of modeled wind power plant and for the computing of power and total produced energy during an average and above-average day as well. The whole thesis is enclosed by evaluating of obtained results.
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Ôlo, Carlos David Vaz. "Projecto de uma turbina savonius com utilização de componentes em fim-de-vida". Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8876.

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Dissertação para obtenção do Grau de Mestre em Engenharia Mecânica
O objectivo do presente trabalho, passa por encontrar soluções para a reutilização de componentes em fim-de-vida, usando-os exactamente como se encontram, desempenhando as mesmas funções para que foram projectados, fazendo apenas pequenas adaptações para se adequarem à nova utilização. Para a reutilizar estes componentes a solução escolhida, foi projectar uma turbina eólica, recorrendo a componentes de automóvel. Sendo o vento um recurso natural disponível em grande parte do globo terrestre, torna aliciante a possibilidade de diminuir a pegada ambiental dos componentes, reutilizando-os, bem como produzir energia recorrendo à energia eólica. A turbina escolhida foi a de savonius, pois tem custos de fabrico reduzidos, pela simplicidade de construção e montagem bem como ser uma turbina interessante para pequenos aproveitamentos energéticos. Foi estudado o rotor de savonius para compreender os esforços a que se encontra sujeito devido à acção do vento, para posteriormente projectar a estrutura do rotor e de suporte da turbina. Durante o presente trabalho foi tido em conta, que se trata de um projecto no âmbito universitário, de modo que a turbina terá que ser polivalente para possibilitar outros estudos no futuro.
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Oliveira, Cássia Pederiva de. "Análise do desempenho de uma turbina savonius helicoidal com torção de 180º empregando simulação numérica". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/108528.

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Este trabalho apresenta a simulação numérica do escoamento turbulento em torno de uma turbina eólica de eixo vertical de pequeno porte, Savonius tipo helicoidal com torção de 180° nas pás. Com o intuito de avaliar a metodologia computacional empregada os resultados numéricos obtidos são comparados com os resultados experimental e numérico contidos no estado da arte. Também, compara-se o coeficiente de toque da turbina Savonius helicoidal com a turbina Savonius convencional. As simulações numéricas são baseadas no Método de Volumes Finitos, e para tal emprega-se o programa Fluent /Ansys versão 13.0 que resolve as equações da continuidade e as equações de Navier-Stokes com médias de Reynolds, juntamente com o modelo de turbulência . As simulações são desenvolvidas empregando diferentes malhas computacionais em estudos transientes, tridimensionais, com a turbina estacionária. A avaliação da qualidade da malha é realizada através do método de Índice de Convergência de Malha (GCI) o qual analisa o quão longe os resultados estão da solução assintótica para a malha utilizada. Após a análise da qualidade de malha, realizam-se simulações com a turbina em rotação as quais fazem uso da malha contendo uma região móvel possibilitando a imposição de uma velocidade angular ao rotor. O coeficiente de torque é obtido nas simulações e a partir dele calcula-se o coeficiente de potência. Além da análise do desempenho do rotor realiza-se uma análise qualitativa das características do escoamento sobre a turbina. A turbina Savonius helicoidal apresenta um valor de coeficiente de potência de 0,175 para a razão de velocidade de ponta de 0,58 considerando correção do efeito de bloqueio. Os resultados obtidos apresentam boa concordância com os resultados publicados por outros autores.
This dissertation presents the numerical simulation of the turbulent flow around of a small sized vertical axis wind turbine, consisting in a helical Savonius type with a 180° degree of blade twist. In order to evaluate the used methodology the obtained results are compared with the state of the art numerical and experimental data. It will be also presented the comparison between the torque coefficient of the conventional Savonius turbine and the helical Savonius turbine. The numerical simulations are based on the Finite Volume Method (FVM), using the commercial code Fluent/ANSYS version 13.0, which solves the continuity and Navier-Stokes through the Reynolds time-averaged methodology, including the turbulence model. The simulations are developed using different computational meshes for transient and three-dimensional studies with the stationary turbine. The evaluating the quality of the mesh is performed by of Grid Convergence Index (GCI) method which analyzes how far the results are the asymptotic solution to the mesh used. After the evaluation of the mesh quality, it was simulated a case considering the rotor motion using the moving mesh configuration, allowing the imposition of an angular velocity to the turbine. In the post-processing stage, it is possible to obtain the torque coefficient on the rotor shaft, allowing the calculation of the power coefficient for the turbine. In addition to the performance analysis, it is also made a qualitative analysis of the flow characteristics over the turbine rotor and in both cases presenting a good correspondence with the results in the literature. The helical Savonius turbine presents a value of power coefficient of 0.175 to a tip speed ratio of 0.58 whereas blocking effect correction.
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Zingman, Aron (Aron Olesen). "Optimization of a Savonius rotor vertical-axis wind turbine for use in water pumping systems in rural Honduras". Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40927.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 26).
The D-lab Honduras team designed and constructed a wind-powered water pump in rural Honduras during IAP 2007. Currently, the system does not work under its own power and water must be pumped by hand. This thesis seeks to explore a variety of mechanism and aerodynamic changes to allow the system to function as designed. The novel modifications to the Savonius rotor that were made do not seem to improve its performance. Within the constraints of the installed components, the current rotor should perform well pending other changes. The most promising improvements to the system are weight reducing and friction reducing measures, and in combination with understanding the wind conditions in the immediate vicinity of the rotor, changes will be made this summer so that unassisted wind pumping will be possible.
by Aron Zingman.
S.B.
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Akwa, João Vicente. "Estudo numérico e experimental do escoamento sobre um rotor eólico Savonius em canal aerodinâmico com alta razão de bloqueio". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/100132.

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Neste trabalho, são inicialmente discutidas as dificuldades referentes à obtenção de resultados numéricos para a operação de uma turbina Savonius independentes do grau de discretização, tamanho de domínio de cálculo e de máximo tempo físico simulado. Também são relatadas as divergências entre as metodologias numéricas e experimentais adotadas por diversos autores, que dificultam análises e comparações dos resultados obtidos por meio dessas metodologias com os resultados próprios obtidos. Devido a esses fatos, no presente trabalho, uma série de procedimentos experimentais e numéricos são realizados para efetuar análises do escoamento sobre uma turbina eólica Savonius. Nos experimentos em canal aerodinâmico, perfis de velocidade e parâmetros da turbulência são obtidos pela técnica de anemometria de fio quente. Medições com o uso de tubos de Pitot e manômetros eletrônicos são efetuadas para avaliar a variação da pressão e os perfis de velocidade média em posições selecionadas. Além de dados para análise, informações úteis para uso como condições de contorno nas simulações numéricas também são obtidas. Os fenômenos são reproduzidos através de simulações numéricas pelo Método de Volumes Finitos, que solucionam as equações da continuidade, de Navier-Stokes com médias de Reynolds e do modelo de turbulência k-ω SST. Análises experimentais e numéricas considerando o escoamento sobre um cilindro, que mantém semelhanças com o escoamento sobre o rotor, também são realizadas. Simulações numéricas do escoamento sobre o cilindro são efetuadas, fornecendo resultados representativos do escoamento real, quando geometrias tridimensionais são aplicadas na modelagem numérica. Nas simulações do escoamento sobre o rotor Savonius em condição estática, resultados representativos do escoamento real são obtidos com o uso de uma modelagem que leva em consideração a rugosidade das pás do rotor, estacionado na posição angular de 90°. Para posições angulares menores, não se obteve uma boa concordância entre os resultados experimentais e numéricos. A realização deste trabalho fornece informações úteis para a análise do fenômeno e tem potencial para contribuir com futuros trabalhos desse tema.
This research work initially presents a discussion about the difficulties related to obtaining numerical results for the operation of a turbine Savonius independent of the degree of discretization, calculation domain size and maximum physical time of the simulation. The differences between the numerical and experimental methodologies adopted by various authors difficult the analysis and comparisons of the results obtained through these methods with the results obtained by the methodology. Due to these facts, in this research work, a series of experimental and numerical procedures are performed to conduct analyzes of flow over a Savonius wind turbine. In the experiments on aerodynamic channel, velocity and turbulence profiles parameters are obtained by the technique of hot wire anemometry. Measurements using Pitot tubes and electronic manometers are made to evaluate the variation of pressure and mean velocity profiles at selected positions. In addition to data analysis, useful information for use as boundary conditions in the numerical simulations are also obtained. The phenomena are reproduced through numerical simulations by Finite Volume Method, that solve the equations of continuity, Reynolds-averaged Navier–Stokes equations and the equation of the turbulence model k-ω SST. Experimental and numerical analyzes considering the flow over a cylinder, which holds similarities with the flow over the rotor, are also performed. Numerical simulations of the flow over the cylinder are made, providing results representative of the actual flow when three-dimensional geometries are applied in numerical modeling. In flow simulations over the Savonius rotor in static condition, at 90°, representative results of the actual flow are obtained using a model that takes into account the roughness of the rotor blades. For smaller angular positions a good agreement between experimental and numerical results was not obtained. This work provides useful information for the analysis of the phenomenon and has the potential to contribute to future work on this theme.
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Części książek na temat "Savonius rotor"

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Mabrouki, Ibrahim, Zied Driss i Mohamed Salah Abid. "Characteristic of Savonius Vertical Axis Rotor in Water Channel". W Exergy for A Better Environment and Improved Sustainability 1, 411–27. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-62572-0_29.

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Massons, J., Jna Gavaldà, J. Escoda, X. Ruiz i F. Díaz. "Characterization of Savonius Rotor Wake Using Image Processing Techniques". W Fluid Mechanics and Its Applications, 145–57. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2690-8_8.

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Fujisawa, Nobuyuki. "Visualization of Flow Phenomena in and Around a Savonius Rotor". W Flow Visualization VI, 289–93. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_49.

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Zakaria, Ahmad, i Mohd Shahrul Nizam Ibrahim. "Time Step Sensitivity Analysis of a Flow-Driven Savonius Rotor". W Advances in Material Sciences and Engineering, 225–32. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8297-0_25.

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Pudur, Rajen, Mrinal Kanti Rajak i Shadab Zafar. "Analysis of Savonius Rotor with Multiple Blades for Hydrokinetic Application". W Lecture Notes in Mechanical Engineering, 623–34. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-3497-0_50.

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Doso, Oying, i Sarsing Gao. "Power Quality Improvement of Cascaded Savonius Rotor Based Hydrokinetic Power System". W Lecture Notes in Electrical Engineering, 265–73. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7031-5_25.

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Prabowoputra, Dandun Mahesa, Syamsul Hadi, Aditya Rio Prabowo i Jung Min Sohn. "Performance Assessment of Water Turbine Subjected to Geometrical Alteration of Savonius Rotor". W Proceedings of the 6th International Conference and Exhibition on Sustainable Energy and Advanced Materials, 351–65. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4481-1_35.

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Driss, Zied, Olfa Mlayeh, Dorra Driss, Makram Maaloul i Mohamed Salah Abid. "Incidence Angle Effect on the Aerodynamic Structure of an Incurved Savonius Wind Rotor". W Applied Condition Monitoring, 101–10. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14532-7_11.

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Frikha, Sobhi, Zied Driss, Hedi Kchaou i Mohamed Salah Abid. "Study of the Incidence Angle Effect on a Savonius Wind Rotor Aerodynamic Structure". W CFD Techniques and Energy Applications, 161–77. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70950-5_8.

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Meri AR, Salih, i Hamidon Bin Salleh. "Numerical Investigation of Savonius Rotor Elliptical and the Design Modification on a Blade Shape". W Advances in Material Sciences and Engineering, 177–85. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8297-0_20.

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Streszczenia konferencji na temat "Savonius rotor"

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Doso, Oying, i Sarsing Gao. "A short review on savonius rotor". W PROCEEDINGS OF ADVANCED MATERIAL, ENGINEERING & TECHNOLOGY. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0024293.

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Baz, Ahmed M., Nabil A. Mahmoud, Ashraf M. Hamed i Khaled M. Youssef. "Optimization of Two and Three Rotor Savonius Wind Turbine". W ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43988.

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Streszczenie:
The present work investigates the performance of Savonius wind turbine using two or three rotors. The new turbine design was found to have higher power coefficient compared with single rotor design. The peak average power coefficient of the three rotors was computed to be 50% higher than that of the single rotor design. The torque coefficient was also higher than that of the single rotor turbine at high tip speed ratio. This improved performance is attributed to the favorable aerodynamic interaction between the rotors which accelerates the flow around the rotors and generates higher turning torque in the direction of rotation for each rotor. The optimized arrangement of rotors showed that the upstream rotor and one downstream rotor should have a similar direction of rotation while the second downstream rotor is rotating in opposite direction.
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Gaul, R. D., Claude P. Brancart i Vincent Gaul. "Savonius Rotor for Offshore Wind Energy Conversion". W Offshore Technology Conference. Offshore Technology Conference, 2011. http://dx.doi.org/10.4043/21725-ms.

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Saad, Ahmed S., Shinichi Ookawara, Ahmed Elwardany, Ibrahim I. El-Sharkawy i Mahmoud Ahmed. "Effect of the Number of Stages on the Performance of Savonius Vertical Axis Wind Turbines: Part II — Using Twisted Blades". W ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23574.

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Abstract Wind energy comprises one of several renewable resources of energy engineered to contain the global energy crisis. Although horizontal axis wind turbines (HAWTs) have proven to be effective in low turbulence and steady wind conditions, vertical axis wind turbines (VAWTs) potentially have the advantage in highly variable and turbulent regions. The Savonius vertical axis wind turbine has several advantages such as simple design, low manufacturing costs, low operating wind speed, low noise, and Omni-directional capability. However, the Savonius rotor requires further design optimization to improve its aerodynamic performance before becoming competitive with other turbine designs. Thus, the main objective of the current study is to numerically investigate the aerodynamic performance of a multistage Savonius rotor to enhance the power coefficient and the ability of self-starting. In the current study, one-, two-, three-, and four-stage Savonius rotors with twisted blades are investigated. In a two-stage rotor, one single-stage rotor is mounted over another single-stage with a phase angle of 90°. In a three-stage rotor, the three single-stage rotors are mounted one above the other with a phase angle of 60° relative to one another while with a phase angle of 45° for the four stage-rotor. The blades of the studied Savonius rotor are twisted with a twist angle (φ) of 45°. This is the first contribution to understand how multi-stages influence the aerodynamic performance of the twisted-bladed Savonius rotor. Moreover, variations of torque and power coefficients are computed for all the studied rotors with various numbers of stages. The developed numerical model is simulated using ANSYS Fluent and validated using the available experimental and numerical results. Results showed that the coefficients of torque (CT) and power (CP) increase with rising the number of stages. Increasing the number of stages from 1 to 2 significantly increases the CT and CP of the rotor. However, with a further increase in the number of stages to 3 and 4 stages, both the CT and CP remains almost the same as the rotor with 2 stages. The maximum coefficient of torque (CT, max) and power (CP, max) for a two-stage rotor are 0.42 and 0.253, respectively. The gain in the coefficient of power obtained by using the two-stage Savonius rotor with twisted blades is 53.5% compared to the conventional single-stage which has a coefficient of power 0.165 at a wind velocity of 6 m/s. Moreover, using multi-stages and twisted blades significantly smooth the variations in the generated torque and produce positive values at all rotor angles resulted in improving the self-starting ability of the Savonius rotor.
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Hidalgo, Ivan Ruiz, Ivan Ostos Rojas, Adriana Bonilla Riano, Carlos Collazos Morales i Alejandra Rojas Arias. "Evaluation of a Geometric Modification in Savonius Rotor Using CFD Evaluación de Modificación Geométrica en Rotor Savonius Usando CFD". W 2018 IEEE ANDESCON. IEEE, 2018. http://dx.doi.org/10.1109/andescon.2018.8564608.

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Ghosh, Pronoy, Mahesh Kamoji, S. Prabhu, A. Date i S. Kedare. "Model Testing of Savonius Rotor and Wind Pump". W 26th AIAA Aerodynamic Measurement Technology and Ground Testing Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4371.

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Nugroho, Agung Dwi, Dominicus Danardono Dwi Prija Tjahjana i Budi Kristiawan. "Slotted blade effect on Savonius wind rotor performance". W THE 5TH INTERNATIONAL CONFERENCE ON INDUSTRIAL, MECHANICAL, ELECTRICAL, AND CHEMICAL ENGINEERING 2019 (ICIMECE 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000891.

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Ibrahim, Ahmed, i Ahmed M. R. Elbaz. "Investigating Efficient Clusters of Savonius Wind Turbines". W 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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Filali, Abdelkader, Lyes Khezzar i Hamza Semmari. "Improved Power for Wind Farm Savonius Rotors: Effect of Blade Shape and Rotors Position". W ASME 2020 Fluids Engineering Division Summer Meeting collocated with the ASME 2020 Heat Transfer Summer Conference and the ASME 2020 18th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/fedsm2020-20071.

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Abstract In the present study the effect of distance between five vertical Savonius rotors « Gap » on the total performance of the wind farm rotors is investigated. Numerical computations are conducted for a single Savonius turbine, and for the five clustered turbines aligned in perpendicular direction with respect to the upstream wind velocity. The study is carried out using ANSYS FLUENT commercial code and the moving mesh approach for the rotating zones is used. The turbulence model adopted in this work is the k-ω shear stress transport (SST) model. Numerical approach was first validated with previously published experimental and numerical data for a single rotating Savonius rotor case with semi-circular blades. Then, an improvement process based on the modification of the blades profiles to an elliptical shape was adopted. Subsequently, the change in distance between the five vertical Savonius rotors « Gap » has been considered with values of 0.25, 1 and 1.4 times the rotor radius (R). Results show that the Gap = 1R provides the optimum power coefficient for the wind farm rotors. However, the generated wake zone behind the five aligned rotors for this value is more important in particular for the 90 ° angle of the advanced and returned rotor blades. The field efficiency defined by the total power ratio of the five isolated rotors to the total power of the wind farm with five Savonius rotors is around 67%. All these geometrical considerations and propositions made it possible to define an optimal wind farm rotors arrangement.
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Saad, Ahmed S., Shinichi Ookawara, Ahmed Elwardany, Ibrahim I. El-Sharkawy i Mahmoud Ahmed. "Effect of the Number of Stages on the Performance of Savonius Vertical Axis Wind Turbines: Part I — Using Straight Semicircular Blades". W ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23555.

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Abstract The Savonius vertical axis wind turbine offers several benefits as simple construction, low manufacturing, installation and maintenance costs, low operating wind speed, and independence of wind direction. However, the conventional single-stage Savonius rotors have negative torque values at a certain range of rotor angles and large torque variation over the complete cycle which led to reduction of the power coefficient and the self-starting abilities. To overcome these drawbacks, a multi-stage Savonius wind rotor is proposed to obtain the optimum number of stages that enhances both the power coefficient and the self-starting capabilities. In the current study, one-, two-, three-, and four-stage Savonius wind rotors with straight semicircular blades are investigated. In two stages rotor, one single-stage rotor is mounted over another single stage with a phase shift of 90°. In the three stages rotor, the three singlestage rotors are mounted one above the other with a phase shift of 60° relative to one another while with a phase shift of 45° for the four stages. All rotors have overall rotor diameter (D) of 200 mm, a thickness of 2 mm, a stage aspect ratio of 1.0, and an overlap ratio (δ) of 0.0. The diameter of the circular end plates (Do) attached to the rotor tips is 1.1 of the rotor diameter (D). All studies are performed at a wind speed (V) of 6 m/s. The variations of torque and power coefficients are estimated for all the studied multi-stages rotors. Therefore, 3D incompressible unsteady Reynolds-Averaged Navier-Stokes equations along with the k-ω shear-stress transport turbulence model is developed and numerically simulated using ANSYS Fluent. The numerical model is validated using the available measurements and numerical results. The predicted flow field characteristics such as streamlines and pressure fields around the studied rotors with various numbers of stages are presented and analyzed. Accordingly, results indicated that with the increase in the number of stages, a significant enhancement of the torque and the power coefficients is attained. In addition, the rate of percentage gain in the torque and the power coefficients is higher for two stages rotor than that of three and four stages rotors. The maximum torque and power coefficients for the two stages rotor are 0.336 and 0.194, respectively. The power coefficient gain obtained by using the two stages Savonius rotor is 17.5 % compared to the conventional single stage which has a power coefficient of 0.165 at a wind velocity (V) of 6 m/s. Furthermore, using a multi-stage rotor significantly smooths the variations in the torque coefficient and produces positive static torque values at all rotational angles resulted in enhancing the self-starting capabilities of the Savonius rotor.
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