Journal articles: 'Darrieus Rotor'

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

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

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

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

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

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

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Mohan Kumar, Palanisamy, Mohan Ram Surya, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna, and He Wei. "Computational Optimization of Adaptive Hybrid Darrieus Turbine: Part 1." Fluids 4, no. 2 (May 17, 2019): 90. http://dx.doi.org/10.3390/fluids4020090.

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

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Torabi Asr, Mahdi, Reza Osloob, and Faizal Mustapha. "Double-Stage H-Darrieus Wind Turbine - Rotor Aerodynamics." Applied Mechanics and Materials 829 (March 2016): 21–26. http://dx.doi.org/10.4028/www.scientific.net/amm.829.21.

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H-Darrieus wind turbines, due to their simple design and relatively low manufacturing costs have recently received much attention particularly for standalone applications. However start-up issues associated with their operation restricted their operation in areas of low average wind speed and encourages engineers to develop novel design. Several design proposed in this way but in most cases design came up with complex sensing mechanisms and mechanical actuators or high cost manufacturing parts. A recent rotor design called double Darrieus rotor proposed as a German patent case bridged these complexities appropriately. The aim of present study is to investigate this innovative design from aerodynamic point of view by means of validated CFD techniques. A flow-driven simulation setup based on 6DOF calculations employed in order to study rotor operation from stand still until peak performance obtained. Results from these precise modeling reveal the superiority of the proposed double-stage design in compare with the original H-Darrieus rotors in terms of start-up behavior and optimum performance.

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

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

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Alfian, Mizar, Poppy Puspitasari, Ahmad Taufiq, Muhammad Trifiananto, and A. Aripriharta. "An experimental test of the effect of cup diameter on the power performance of novel design HC-type VAWT." Journal of Applied Engineering Science 18, no. 4 (2020): 631–36. http://dx.doi.org/10.5937/jaes0-25010.

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Wind energy is one solution to overcome the energy problem in Indonesia. This study aimed to analyze the effect of cup diameter on the power performance of an HC-type vertical axis wind turbine (VAWT). The wind turbine used a combination of an H-type Darrieus wind turbine and a type-C rotor VAWT. The Darrieus HC-rotor wind turbine blade has a height H = 800 mm and diameter D = 800 mm with C-rotor variations on the tip with diameters of 76,2, 101,6, and 152,4 mm. The wind tunnel used an electric motor with a power of 1 HP (740 Watt) and 1400 rpm connected to a fan. The variation of wind speed was set to 2, 3, 4, 5, 6 and 7 m/s. The results showed that: (a) the highest rotation speedal speed was achieved by the HC-rotor diameter of 76,2 on 105 rpm with a wind speed of 7 m/s; (b) the highest value of the coefficient of power (Cp) is achieved by the HC-rotor diameter of 101,6mm (c) the highest value of the coefficient of torque (Ct) is achieved with the HC-rotor diameter of 152,4mm (d) the Darrieus HC-rotor wind turbine is suitable to be used in tropical regions that have low wind speeds. This result provides important information about the effect of the C rotor radius on the performance of HC-rotor Darrieus wind turbine blade vertical axis.

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Brahimi, M. T., and I. Paraschivoiu. "Darrieus Rotor Aerodynamics in Turbulent Wind." Journal of Solar Energy Engineering 117, no. 2 (May 1, 1995): 128–36. http://dx.doi.org/10.1115/1.2870839.

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The earlier aerodynamic models for studying vertical axis wind turbines (VAWT’s) are based on constant incident wind conditions and are thus capable of predicting only periodic variations in the loads. The purpose of the present study is to develop a mode capable of predicting the aerodynamic loads on the Darrieus rotor in a turbulent wind. This model is based on the double-multiple streamtube method (DMS) and incorporates a stochastic wind model The method used to simulate turbulent velocity fluctuations is based on the power spectral density. The problem consists in generating a region of turbulent flow with a relevant spectrum and spatial correlation. The first aerodynamic code developed is based on a one-dimensional turbulent wind model. However, since this model ignores the structure of the turbulence in the crossflow plane, an extension to three dimensions has been made. The computer code developed, CARDAAS, has been used to predict aerodynamic loads for the Sandia-17m rotor and compared to CARDAAV results and experimental data. Results have shown that the computed aerodynamic loads have been improved by including stochastic wind into the aerodynamic model.

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Gorelov, D. N. "Energy characteristics of Darrieus rotor (review)." Thermophysics and Aeromechanics 17, no. 3 (September 2010): 301–8. http://dx.doi.org/10.1134/s0869864310030017.

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Alqurashi, Faris, and M. H. Mohamed. "Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine." Modelling and Simulation in Engineering 2020 (January 11, 2020): 1–15. http://dx.doi.org/10.1155/2020/1368369.

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Darrieus wind rotor is a vertical axis wind turbine that is a very promising kind of wind converters at remote and domestic locations that have soft and weak wind potential and speed, but from the quantitative comparison with horizontal axis wind turbines, this type of turbines has a weak performance. Additional researches are still needed to develop its efficiency to identify all the requirements of the generated power in low power demands. The aim of the current investigation is to analyze all the acting forces on the main parts of Darrieus rotor over the rotations as well as in maintenance and stationary conditions. Aerodynamic forces assessment will be executed for 3 different blade shapes (nonsymmetric and symmetric airfoils) like the airfoil section shapes of the Darrieus rotor blades. NACA 0021, LS413, and S1046 are selected as cross-sectional profile in this work. CFD simulations have been used in this work to get the different aerodynamic forces on the rotor blades of the Darrieus turbines. The present results indicated that the symmetric S1046 blade has higher forces during the rotation and stagnant (static) conditions. Moreover, the self-starting capability of NACA 0021 is better than S1046 due to low aerodynamic torsion on the S1046 blades.

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Mohammed, Gwani, Mamuda Buhari, Umar Muhammed Kangiwa, and John Danyaro. "Design, Fabrication and Performance Evaluation of Hybrid Vertical Axis Wind Turbine." International Journal for Modern Trends in Science and Technology 6, no. 6 (June 28, 2020): 80–86. http://dx.doi.org/10.46501/ijmtst060618.

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

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12

Mei, Yi, and Jian Jun Qu. "Aerodynamic Performance Evaluation with a New Method for Darrieus Wind Turbine." Advanced Materials Research 1014 (July 2014): 115–19. http://dx.doi.org/10.4028/www.scientific.net/amr.1014.115.

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The operation condition for darrieus wind turbine is usually complex in urban sites. One of characteristics is unsteady tip speed ratios during the rotor operating, which makes the widely used aerodynamic performance indicator, maximum power coefficient, not so suitable for evaluating vertical axis rotor performance. In this paper, a new method based on the power coefficient values under variable tip speed ratios was developed and the mathematical expression derived by numerical integration measure was presented. Furthermore, a novel wind turbine power performance indicator, average effective wind energy utilization coefficient, has been defined for the rotor performance assessment. A wind tunnel case of darrieus wind turbine with different blade cord length was selected for analyzing. Results demonstrate the proposed method is correct and practical.

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Bianchini, Alessandro, Giovanni Ferrara, Lorenzo Ferrari, and Sandro Magnani. "An Improved Model for the Performance Estimation of an H-Darrieus Wind Turbine in Skewed Flow." Wind Engineering 36, no. 6 (December 2012): 667–86. http://dx.doi.org/10.1260/0309-524x.36.6.667.

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Small turbines are considered one of the most promising technologies for an effective diffusion of renewable energy sources in new installation contexts with a high degree of integration with human activity (e.g. the urban environment). In these new installations, however, the real working conditions can be far from the nominal ones. In particular, the turbine functioning can be noticeably affected by misalignments between the oncoming flow and the axis of the rotor; differently from horizontal-axis wind turbines, whose performance is decreased by a skew angle, H-Darrieus turbines are thought to take advantage from this condition in some cases. In this study, an improved model for the performance prediction of H-Darrieus rotors under skewed flow was developed. In detail, a theoretical approach based on Momentum Models was properly modified to account for the variations induced by the new direction of the flow which invests the rotor. In particular, the modifications in the aerodynamic characteristics of the airfoils, the swept area and the streamtubes distribution were modeled. The performance predictions of the new model were compared both with experimental data available in the technical literature and with the results of wind tunnel tests purposefully carried out on a full scale model of an H-Darrieus turbine. Notable agreement has been constantly obtained between simulations and experiments.

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Manatbayev, R. K., A. Georgiev, R. Popov, D. Dzhonova-Atanasova, А. А. Kuikabayeva, and E. M. Zulbukharova. "The effect of design parameters on energy characteristics of Darrieus rotor." International Journal of Mathematics and Physics 7, no. 1 (2016): 94–98. http://dx.doi.org/10.26577/2218-7987-2016-7-1-94-98.

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Chua, Bih Lii, Mohd Suffian Misaran, Yan Yan Farm, Mizanur Rahman, and Benjoe Eldana Barahim. "Development of Mixed Vertical Axis Wind Turbine (MVAWT) for Low Wind Condition." Applied Mechanics and Materials 660 (October 2014): 811–15. http://dx.doi.org/10.4028/www.scientific.net/amm.660.811.

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Small-scaled renewable energy generation such as micro-hydro and domestic solar panel has become the recent trend of research in order to achieve sustainable energy generation and to eliminate the reliance of geographical selection and large farm area. As for the case of wind energy, a wind turbine that can operate at low wind condition are desirable. This paper presents a mixed design for Vertical Axis Wind Turbine comprises of Savonius and Darrieus rotors, being assembled together as a single rotor turbine. The mixed wind turbine model (MVAWT) was fabricated and tested in our lab as prove of concept. Experiments conducted on 5 MVAWT’s configurations and being compared to a standalone Darrieus turbine with +3 degree pitch angle, showed promising result in lowering the self-start speed of the Darrieus turbine. It was observed that all the positive pitch angle MVAWTs has started to rotate at lower wind speed (about 1.8 m/s) while the standalone Darrieus turbine was only started to rotate at wind speeds more than 3.0 m/s. However, the lower self-start were also being compensated by lower turbine rotational speed. With the low self-start speed in the MVAWT, it will enable the wind energy capture for a longer period of time at a low wind condition site. This development should lead to an interesting research on optimizing the mixture of Savonius and Darrieus turbine for a localized low wind speed conditions in the future.

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Patil, Rohit, László Daróczy, Gábor Janiga, and Dominique Thévenin. "Large eddy simulation of an H-Darrieus rotor." Energy 160 (October 2018): 388–98. http://dx.doi.org/10.1016/j.energy.2018.06.203.

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Dosaev, M. Z., L. A. Klimina, B. Ya Lokshin, Yu D. Selyutskiy, and E. S. Shalimova. "AUTOROTATION MODES OF DOUBLE-ROTOR DARRIEUS WIND TURBINE." Mechanics of Solids 56, no. 2 (March 2021): 250–62. http://dx.doi.org/10.3103/s0025654421020060.

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Dabachi, Mohamed Amine, Abdellatif Rahmouni, Eugen Rusu, and Otmane Bouksour. "Aerodynamic Simulations for Floating Darrieus-Type Wind Turbines with Three-Stage Rotors." Inventions 5, no. 2 (April 29, 2020): 18. http://dx.doi.org/10.3390/inventions5020018.

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Growing energy demand is causing a significant decrease in the world’s hydrocarbon stock in addition to the pollution of our ecosystem. Based on this observation, the search for alternative sorts of energy to fossil fuels is being increasingly explored and exploited. Wind energy is experiencing a very important development, and it offers a very profitable opportunity for exploitation since the wind is always available and inexhaustible. Several technical solutions exist to exploit wind energy, such as floating vertical axis wind turbines (F-VAWTs), which provide an attractive and cost-effective solution for exploiting higher resources of offshore wind in deep water areas. Recently, the use of the Darrieus vertical axis wind turbine (VAWT) offshore has attracted increased interest because it offers significant advantages over horizontal axis wind turbines (HAWTs). In this context, this article presents a new concept of floating Darrieus-type straight-bladed turbine with three-stage rotors. A double-multiple stream tube (DMST) model is used for aerodynamic simulations to examine several critical parameters, including, solidity turbine, number of blades, rotor radius, aspect ratio, wind velocity, and rotor height. This study also allows to identify a low solidity turbine (σ = 0.3), offering the best aerodynamic performance, while a two-bladed design is recommended. Moreover, the results also indicate the interest of a variable radius rotor, as well as the variation of the height as a function of the wind speed on the aerodynamic efficiency.

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Mon, Thuzar, and Supakit Worasinchai. "Performance modelling of the Darrieus wind turbine." E3S Web of Conferences 302 (2021): 01001. http://dx.doi.org/10.1051/e3sconf/202130201001.

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Three-dimensional numerical investigation of the Darrieus wind turbines equipped with different aerofoils is presented in this paper. In the modelling, the computational domain was divided into three different domains and they are blade, rotor, and tunnel domains. A cylindrical domain was created to cover the blade area so that a fine mesh can be applied. The Computational Fluid Dynamics (CFD) was employed to solve and analyze the flow field around the turbine. The Menter Shear Stress turbulence model was chosen in this investigation. Boundary conditions applied were velocity at the inlet, pressure opening at the outlet, and symmetry on other sides. Comparison of simulation results and experiments showed good agreement. The investigation of the effects of the rotor solidity and the aerofoil shape was performed. The simulation results reveal that the aerofoil shape has a significant impact on the turbine performance. For the rotor solidity of 0.7, the change from the NACA section to the S1046 leads to a reduction of power at low tip speed ratios but the performance improvement is observed when the tip speed ratio is greater than 1.5. With the lower solidity of 0.375, the effects of the aerofoil change is less pronounced at low tip speed ratios. Nevertheless, the maximum power coefficient increases for both cases. Further analysis shows that the S1046 is less sensitive to the wind speed change and is promising in the urban application where the wind speed is relatively low.

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Rahuna, Daif. "Kajian Eksperimental Konversi Energi Gelombang dengan Menggunakan Kombinasi Wells Rotor dan Turbin Darrieus." Wave: Jurnal Ilmiah Teknologi Maritim 10, no. 1 (July 18, 2016): 31–38. http://dx.doi.org/10.29122/jurnalwave.v10i1.2631.

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Potensi energi yang terjadi pada kawasan pesisir pantai sangat besar, bagaimana memanfaatkan energi yang bersumber dari arus (longshore current, rip current, back flows/cross-shore flows) dan gelombang pantai tersebut sebagai sumber energi baru terbarukan. Kajian eksperimental ini dilakukan adalah untuk membuktikan bahwa dua tipe turbin yang berbeda untuk dapat mengkonversi energi arus dan gelombang bersamaan. Hasil dari kajian eksperimental adalah Wells rotor yang terpasang horisontal hanya mampu menerima energi gelombang akibat adanya gerakan orbital dari partikel-partikel air dan tidak efektif dalam menerima energi arus air karena sejajar dengan arah aliran partikel air. Bilah turbin darrieus akan menjadi resistance disaat terkena gelombang. Turbin kombinasi mempunyai self starting yang rendah dimana pada kecepatan arus 0,2 m/s dan tinggi gelombang 0,08 m. efisiensi maksimal yang diperoleh dari turbin kombinasi wells dan darrieus adalah sebesar 21,6 persen dan pada wells rotor sebesar 20,8 persen dengan ketinggian gelombang 0,123 m. Tip speed ratio (TSR) pada turbin kombinasi sebesar 1,84 dan pada wells rotor sebesar 2,26.

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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.

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Buana, Chandra, Muh Yusuf Yunus, Muh Rinaldi Pratama, and Muh Saqib Nurfaizi. "UJI EXPERIMENTAL MODEL TURBIN HYBRID SAVONIUS BERTINGKAT DAN DARRIEUS TIPE H ROTOR." Jurnal Sinergi Jurusan Teknik Mesin 15, no. 2 (May 26, 2019): 181. http://dx.doi.org/10.31963/sinergi.v15i2.1193.

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Angin merupakan salah satu energi yang sedang dikembangkan saat ini. Perkembangan energi angin di Indonesia untuk saat ini masih tergolong rendah. Salah satu penyebabnya adalah karena kecepatan angin rata-rata di wilayah Indonesia tergolong kecepatan angin rendah, yaitu berkisar antara 3 m/s hingga 5 m/s. Turbin yang cocok digunakan dengan kisaran kecepatan angin tersebut adalah turbin hybrid. Pada penelitian sebelumnya, telah didapatkan bahwa turbin 2S4D dan 3S3D memiliki kinerja terbaik. Tetapi pada kedua turbin tersebutmasih terdapat beberapa kekurangan. Oleh karena itu, untuk memperbaiki kekurangan sebelumnya maka dilakukan penelitian mengenai turbin 2S4D dan 3S3D. Metode yang digunakan adalah metode experimen dan pengembangan, dimana penelitian ini mengembangkan turbin angin hybrid yang telah dikembangkan sebelumnya dengan merancang bangun turbin savonius bertingkat dengan perbedaan sudu serang setiap tingkat sebesar 900, sedangkan untuk turbin darrieus menggunakan Airfoil NACA 2412. Pengujian turbin dilakukan skala lab, dimana sumber angin berasal dari wind tunnel. Adapun data yang dihasilkan dalam pengujian yaitu data mekanik dan data elektrik. Setelah melakukan penelitian, dapat disimpulkan bahwa kedua turbin hybrid yang dibuat memiliki kinerja terbaik dibandingkan dengan turbin hybrid yang dibuat sebelumnya, di mana untuk turbin 2S4D memiliki efisiensi rata-rata 37,6% dan turbin 3S3D memiliki efisiensi rata-rata 29,6%. (Keterangan: S = Savonius & D = Darrieus)Kata Kunci : Turbin angin hybrid, Savonius, Darrieus, Airfoil NACA 2412.

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Effendi, Rian, and Rudi Siswanto. "PROSES MANUFAKTUR TURBIN ANGIN SUMBU VERTIKAL TIPE DARRIEUS." JTAM ROTARY 1, no. 2 (September 1, 2019): 117. http://dx.doi.org/10.20527/jtam_rotary.v1i2.1742.

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Wind turbine is one of the tools yamg work to take advantage of wind allergy. Wind turbines based on the type of rotor there are two types of Darrieus wind turbines and Savonius wind turbines. In the manufacturing process using a type of wind turbine type Darrieus. The darrieus turbine is a wind turbine that utilizes the lift style on the rotor blade. This turbine requires initial energy to spin. The formulation of the problem in making this wind turbine is How does the manufacturing process of vertical turbine type darrieus wind turbine and How much is the cost budget on the manufacturing process of the darrieus type verical wind turbine. The components of the wind turbine are the foot frame, bearing bearings, bearings, shafts, disks, blade arms, blades, transmission pulleys and belts-v, while the tools and machinery used in the manufacturing process are electric welding tools, electric grinding wheels, , hand drilling machine, sitting drilling machine, cut lever, riverter pliers, acetylene welding and lathe. Keywords: Wind Turbine, Turbine Components, Tools and MachinesApple, JM. Tata Letak Pabrik dan Pemindahan Bahan. Bandung : Penerbit ITB, Terj. Nurhayati Mardiono.,1990.Maheswari Hesti,Achmad Dany Firdauzy.2015. “Evaluasi Tata Letak Fasilitas Produksi Untuk Meningkatkan Efisiensi Kerja Pada Pt. Nusa Multilaksana. Fakultas Ekonomi”. Jakarta:Universitas Mercu Buana.Susetyo Joko dkk.2010. “Perancangan Ulang Tata Letak Fasilitas Produksi Dengan Pendekatan Group Technology Dan Algoritma Blocplan Untuk Meminimasi Ongkos Material Handling”. yogyakarta:AKPRIND.Nova St Meirizha. 2014. “Perancangan Ulang Tata Letak Fasilitas Pada Hanggar Pemeliharaan Pesawat Hawk 100/200 Di Pangkalan Udara Roesmin Nurjadin”. Riau: Program Studi Teknik Industri, Fakultas Teknik,Universitas Muhammadiyah.Wignjosoebroto, sritomo. Tata letak pabrik dan pemindahan bahan. Surabaya: penerbit guna widya., 1996.

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Кауаn, V. "DARRIEUS TYPE WIND TURBINE WITH CONTROLLED BLADES." Eurasian Physical Technical Journal 17, no. 2 (December 24, 2020): 69–72. http://dx.doi.org/10.31489/2020no2/69-72.

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The results of studies on possibility of increasing efficiency in the use of wind energy and improving the dynamic characteristics of Darrieus wind turbine with straight blades are described. It is shown how the values of torque on the rotor shaft may be optimized by controlling the orientation of the turbine blades relative to the oncoming flow. Control of blades was provided with a cylindrical track of the special form in plan. The track form allowed to establish optimum angle of attack on each site of blade circular trajectory. It allowed to increase power coefficient Cp by 1.5 times and to reduce wind speed at which there is self-start of the wind turbine

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Hashem, I., and M. H. Mohamed. "Aerodynamic performance enhancements of H-rotor Darrieus wind turbine." Energy 142 (January 2018): 531–45. http://dx.doi.org/10.1016/j.energy.2017.10.036.

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Antar, Elie, Amne El Cheikh, and Michel Elkhoury. "A Dynamic Rotor Vertical-Axis Wind Turbine with a Blade Transitioning Capability." Energies 12, no. 8 (April 16, 2019): 1446. http://dx.doi.org/10.3390/en12081446.

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This work presents an optimized design of a dynamic rotor vertical-axis wind turbine (DR VAWT) which maximizes the operational tip-speed ratio (TSR) range and the average power coefficient (Cp) value while maintaining a low cut-in wind velocity. The DR VAWT is capable of mimicking a Savonius rotor during the start-up phase and transitioning into a Darrieus one with increasing rotor radius at higher TSRs. The design exploits the fact that with increasing rotor radius, the TSR value increases, where the peak power coefficient is attained. A 2.5D improved delayed detached eddy simulation (IDDES) approach was adopted in order to optimize the dynamic rotor design, where results showed that the generated blades’ trajectories can be readily replicated by simple mechanisms in reality. A thorough sensitivity analysis was conducted on the generated optimized blades’ trajectories, where results showed that they were insensitive to values of the Reynolds number. The performance of the DR VAWT turbine with its blades following different trajectories was contrasted with the optimized turbine, where the influence of the blade pitch angle was highlighted. Moreover, a cross comparison between the performance of the proposed design and that of the hybrid Savonius–Darrieus one found in the literature was carefully made. Finally, the effect of airfoil thickness on the performance of the optimized DR VAWT was thoroughly analyzed.

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Ramlee, Muhamad Fadhli, Ahmad Fazlizan, and Sohif Mat. "Performance Evaluation of H-Type Darrieus Vertical Axis Wind Turbine with Different Turbine Solidity." Journal of Computational and Theoretical Nanoscience 17, no. 2 (February 1, 2020): 833–39. http://dx.doi.org/10.1166/jctn.2020.8726.

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Among renewable energy resources, wind energy is one of the best alternative for power generation. Recently, vertical axis wind turbine (VAWT) received renewed interest as small-scale wind energy converter due to its suitability for urban application, where the wind condition is known to be unsteady and turbulence. Amongst various type of VAWTs, H-type Darrieus rotor has become more popular, thanks to its simple construction features, resulting to low manufacturing and installation cost. The aim of this paper is to evaluate numerically the power performance of straight-bladed Darrieus VAWT with different turbine solidity using computational fluid dynamic (CFD) technology. A series of two-dimensional CFD simulations of a three-bladed H-type Darrieus rotor were performed with 3 different solidities, σ (0.3, 0.5 and 0.7) to evaluate their power performance. Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations were used to calculate the instantaneous moment coefficient, Cm and power coefficient, Cp over a range of tip speed ratio, λ (0.5–4.5) with a free stream velocity of 8.0 m/s. The simulation results show that high solidity turbine performed well at low values of λ while turbine with low solidity has a wider operating range of λ and performed better at λ > 3.0 due to less blade-wake interactions between upstream and downstream halves of the turbine and lower blockage effect. The findings lend substantially to our understanding of physics flow around blades and turbine in order to optimize the power performance of small scale straight-bladed Darrieus VAWT operating in unsteady and turbulence wind condition.

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Fadila, Anis, and Ilham Zakaria. "Rancang Bangun Turbin Angin Tipe Darrieus Tiga Sudu Rangkap Tiga dengan Profil NACA 0006." Eksergi 15, no. 3 (February 17, 2020): 102. http://dx.doi.org/10.32497/eksergi.v15i3.1785.

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<p>Turbin angin Darrieus merupakan turbin angin sumbu vertical yang memilki poros rotor utama disusun tegak lurus dengan kelebihan utama dapat mengkonversi energi angin dari segala arah.Tujuan penelitian ini yaitu Membuat, melakukan uji kinerja dan analisis kinerja model turbin angin Darrieus tiga sudu rangkap tiga profil NACA 0006dan tiga sudu tunggal profil NACA 0018. Metode peneitian meliputi perancangan desain turbin angin Darrieus tiga sudu rangkap tiga, pembuatan, perakitan turbin angin, proses pengujian, dan metode analisis data. Pengujian dilakukan pada kecepatan angin 7-12 m/detik.Analisis uji kinerja turbin angin didasarkan pada perhitungan efisiensi sistem (ƞ sistem). Hasil uji menunjukkan efisiensi sistem tertinggi tiga sudu rangkap tiga NACA 0006 memiliki efisiensi terbesar pada kecepatan angin 7 sampai 11 m/detik yaitu 0,0977 dibandingkan dengan tiga sudu tunggal NACA 0018 yang memiliki efisiensi terbesar hanya pada kecepatan angin 12 m/detik yaitu sebesar 0,154.</p>

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Mabrouki, Ibrahim. "Meshing Effect on the Hydrodynamic Structure Around Water Darrieus Rotor." International Journal of Fluid Mechanics & Thermal Sciences 2, no. 2 (2016): 10. http://dx.doi.org/10.11648/j.ijfmts.20160202.11.

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Malcolm, D. J. "Structural Response of 34‐m Darrieus Rotor to Turbulent Winds." Journal of Aerospace Engineering 6, no. 1 (January 1993): 55–75. http://dx.doi.org/10.1061/(asce)0893-1321(1993)6:1(55).

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Mohamed, M. H. "Aero-acoustics noise evaluation of H-rotor Darrieus wind turbines." Energy 65 (February 2014): 596–604. http://dx.doi.org/10.1016/j.energy.2013.11.031.

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Souaissa, Khaled, Moncef Ghiss, Mouldi Chrigui, Hatem Bentaher, and Aref Maalej. "A comprehensive analysis of aerodynamic flow around H-Darrieus rotor with camber-bladed profile." Wind Engineering 43, no. 5 (August 3, 2018): 459–75. http://dx.doi.org/10.1177/0309524x18791390.

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Improving the H-Darrieus rotor is often followed by the investigation of the influence of the turbine’s parameter design, notably, the aspect ratio, the solidity ( σ), the tip speed ratio, and the airfoil profile shape. In this work, we are interested in both the aerodynamic flows around a straight cambered blade profile and the rotor turbine wake separation of a Darrieus vertical axis wind turbine. The aim of this study is to better understand the evolution of the instantaneous torque and the generated-separated blade vortex during full rotation. Indeed, a three-dimensional computational fluid dynamics model of a vertical axis wind turbine with a straight cambered blade profile NACA4312 operating over a large range of tip speed ratio is considered. The flows are governed by Reynolds-averaged Navier–Stokes equations and the turbulence is modeled with shear stress transport formulations k- ω. This research revealed a high correlation between the evolution of the torque coefficient and the generated-separated blades vortex. In particular, a good correlation between the maximum tip vortices size and the torque coefficient peak is demonstrated.

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Solomin, Evgeny, Irina Kirpichnikova, and Andrey Martyanov. "Iterative Approach in Design and Development of Vertical Axis Wind Turbines." Applied Mechanics and Materials 792 (September 2015): 582–89. http://dx.doi.org/10.4028/www.scientific.net/amm.792.582.

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Universal step-by-step method of design and development of multi-tier H-Darrieus Vertical-Axis Wind Turbine is described. The method is based on the systemic scientific approach of component-wise optimizing of the Turbine including the design of air foils, rotor outline configuration, alternator calculation and the development of power takeoff algorithm.

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González Díaz, Alan Javier, Leonardo José Geovo Coronado, and Yahir Enrique González Doria. "Diseño y modelamiento de un aerogenerador Vawt Darrieus tipo H para la zona costera del departamento de Córdoba." INGENIARE, no. 20 (December 1, 2016): 33. http://dx.doi.org/10.18041/1909-2458/ingeniare.20.407.

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Para esta investigación se utilizó el perfil naca 0025 dada las con-diciones de estabilidad dinámica en bajos números de Reynolds. Se eligió el rotor Darrieus tipo H de baja potencia y a través del modelado del rotor (usando el método DMST) se obtuvieron la dimensión óptima del perfil y el diámetro del aerogenerador. Con el software ANSYS se determinó el rendimiento, obteniendo una longitud de cuerda óptima de 0,55 m y un radio del rotor de 1,3 m. En comparación con los resultados obtenidos el DMST, respecto a las simulaciones realizadas en ANSYS, se tuvo como resultado una discrepancia del 15% para el máximo momento a la velocidad de giro nominal.

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35

Didane, Djamal Hissein. "Investigation of Self-Starting Mechanism on the Performance of Darrieus Rotor." International Journal of Advanced Trends in Computer Science and Engineering 8, no. 1.3 (July 15, 2019): 92–97. http://dx.doi.org/10.30534/ijatcse/2019/1881.32019.

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36

Torresi, Marco, Bernardo Fortunato, and Sergio M. Camporeale. "Numerical Investigation of a Darrieus Rotor for Low-head Hydropower Generation." Procedia Computer Science 19 (2013): 728–35. http://dx.doi.org/10.1016/j.procs.2013.06.096.

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37

Mahamed Sahed Mostafa Mazarbhuiya, Hussain, Agnimitra Biswas, and Kaushal Kumar Sharma. "Experimental Investigation on the Performance of Varying Thickness H-Darrieus Rotor." Journal of Physics: Conference Series 1172 (March 2019): 012082. http://dx.doi.org/10.1088/1742-6596/1172/1/012082.

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Shaaban, S., A. Albatal, and M. H. Mohamed. "Optimization of H-Rotor Darrieus turbines' mutual interaction in staggered arrangements." Renewable Energy 125 (September 2018): 87–99. http://dx.doi.org/10.1016/j.renene.2018.02.094.

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39

Mohamed, M. H. "Performance investigation of H-rotor Darrieus turbine with new airfoil shapes." Energy 47, no. 1 (November 2012): 522–30. http://dx.doi.org/10.1016/j.energy.2012.08.044.

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40

Balduzzi, Francesco, Marco Zini, Andreu Carbó Molina, Gianni Bartoli, Tim De Troyer, Mark C. Runacres, Giovanni Ferrara, and Alessandro Bianchini. "Understanding the Aerodynamic Behavior and Energy Conversion Capability of Small Darrieus Vertical Axis Wind Turbines in Turbulent Flows." Energies 13, no. 11 (June 8, 2020): 2936. http://dx.doi.org/10.3390/en13112936.

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Small Darrieus vertical-axis wind turbines (VAWTs) have recently been proposed as a possible solution for adoption in the built environment as their performance degrades less in complex and highly-turbulent flows. Some recent analyses have even shown an increase of the power coefficient for the large turbulence intensities and length scales typical of such environments. Starting from these insights, this study presents a combined numerical and experimental analysis aimed at assessing the physical phenomena that take place during the operation of a Darrieus VAWT in turbulent flows. Wind tunnel experiments provided a quantification of the performance variation of a two-blade VAWT rotor for different levels of turbulence intensity and length scale. Furthermore, detailed experiments on an individual airfoil provided an estimation of the aerodynamics at high turbulence levels and low Reynolds numbers. Computational fluid dynamics (CFD) simulations were used to extend the experimental results and to quantify the variation in the energy content of turbulent wind. Finally, the numerical and experimental inputs were synthetized into an engineering simulation tool, which can nicely predict the performance of a VAWT rotor under turbulent conditions.

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Rodríguez-Díaz, Juan Camilo, Angie Lizeth Espinosa-Sarmiento, and Yina Faizully Quintero-Gamboa. "Desarrollo de modelo de rotor Darrieus para banco eólico de eje vertical." Revista Habitus: Semilleros de investigación 1, no. 2 (March 22, 2021): e12173. http://dx.doi.org/10.19053/22158391.12173.

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El uso del teorema Π de Buckingham permite el reconocimiento de variables de interés en estudios con modelos en túneles de viento. Con esto se logra replicar y reducir prototipos en modelos de laboratorio para la medición de valores geométricos, dinámicos y cinemáticos. Se presenta el desarrollo matemático y mecánico de un rotor Darrieus H para un banco eólico de eje vertical. Asimismo, se muestran las ecuaciones paramétricas obtenidas junto al modelo CAD. La obtención de dicho modelo se basa en la reducción de un prototipo existente. El uso de herramientas teórico-matemáticas permite la reducción de costos y de logística en el desarrollo de nuevas tecnologías y máquinas.

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Gupta, R., and Agnimitra Biswas. "Computational fluid dynamics analysis of a twisted three-bladed H-Darrieus rotor." Journal of Renewable and Sustainable Energy 2, no. 4 (July 2010): 043111. http://dx.doi.org/10.1063/1.3483487.

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43

Gorelov, D. N. "Semi-empirical method for calculating optimal geometric parameters of the Darrieus rotor." Journal of Applied Mechanics and Technical Physics 56, no. 3 (May 2015): 426–32. http://dx.doi.org/10.1134/s0021894415030128.

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Malcolm, D. J. "Dynamic response of a darrieus rotor wind turbine subject to turbulent flow." Engineering Structures 10, no. 2 (April 1988): 125–34. http://dx.doi.org/10.1016/0141-0296(88)90038-7.

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45

Rogowski. "CFD Computation of the H-Darrieus Wind Turbine—The Impact of the Rotating Shaft on the Rotor Performance." Energies 12, no. 13 (June 28, 2019): 2506. http://dx.doi.org/10.3390/en12132506.

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Aerodynamics of the Darrieus wind turbine is an extremely complex issue requiring the use of very advanced numerical methods. Additional structural components of this device, such as, for example, a rotating shaft disturb the flow through the rotor significantly impairing its aerodynamic characteristics. The main purpose of the presented research is to validate the commonly-used unsteady Reynolds averaged Navier–Stokes (URANS) approach with the shear stress transport (SST) k-ω turbulence model based on the particle image velocimetry (PIV) studies of a two-bladed rotor operating at the moderate tip speed ratio of 4.5. In the present numerical studies, a two-dimensional turbine rotor with a diameter of 1 meter was considered. The following parameters were evaluated: instantaneous velocity fields; velocity profiles in the rotor shadow and aerodynamic blade loads. The obtained numerical results are comparable with the reference experimental results taken from the literature. The second purpose of this work was to examine the influence of the rotating rotor shaft/tower on the wind turbine performance. It has been proven that the cylindrical shaft reduces the power of the device by 2.5% in comparison with the non-shaft configuration.

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Castelli, Marco Raciti, and Ernesto Benini. "Numerical Simulation of a Straight-Bladed Vertical-Axis Water Turbine Operating in a 2 m/s Current." Applied Mechanics and Materials 325-326 (June 2013): 162–66. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.162.

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The present work proposes a full campaign of simulation of a Darrieus-type Vertical-Axis Water Turbine (VAWaterT) operating in an open flow-field. After describing the computational model and the relative validation procedure, a complete campaign of simulations based on full RANS unsteady calculations is presented for a three-bladed rotor architecture, characterized by a NACA 0025 blade profile. Flow field characteristics are investigated for several values of tip speed ratio and for a constant unperturbed free-stream water velocity of 2 m/s. Finally, the torque coefficient generated from the three blades is determined for each simulated angular velocity, allowing the calculation of the rotor power-curve. Keywords: Vertical-Axis Water Turbine, hydrokinetic technology, CFD, NACA 0025.

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Anam, Asroful, Mochtar Asroni, and Teguh Rahardjo. "Peningkatan Kinerja Turbin Angin Vertikal Tipe Darrieus dengan menggunakan Wind Gate." JURNAL FLYWHEEL 11, no. 1 (February 19, 2020): 6–9. http://dx.doi.org/10.36040/flywheel.v11i1.2505.

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Salah satu upaya meningkatkan kinerja turbin angin adalah merekayasa kecepatan angin agar dapat dimanfaatkan secara optimal karena kecepatan angin yang tinggi lebih dapat meningkatkan putaran rotor dibandingkan kecepatan yang rendah. Tetapi hal tersebut memerlukan suatu kajian teori dan eksperimen untuk menjawab pernyataan tersebut, sehingga dilakukanlah penelitian dengan judul “Peningkatan Kinerja Turbin Angin Vertikal Tipe Darrieus dengan Menggunakan Wind Gate”. Penelitian ini menggunakan metode eksperimen dengan jenis Naca 4309 dan variasi jumlah blade 1, 2, 3, dan 4. Pemilihan turbin angin tipe vertikal jenis darrieus didasarkan atas beberapa hal, diantaranya adalah turbin angin vertikal dengan tipe darrieus sangat cocok di gunakan pada daerah yang kecepatan anginnya tidak terlalu tinggi dan tidak membutuhkan tower serta investasi awal pada pembangkit tersebut tidak semahal tipe horisontal. Kemudian penggunaan wind gate dimaksudkan agar hembusan angin menumbuk sudu-sudu turbin dapat lebih terarah dengan berbagai fluktuasi kecepatan angin yang bervariasi. Lokasi penelitian adalah di pantai Sendiki Desa Tambakrejo, Kecamatan Sumbermanjing, Kabupaten Malang. Dari data hasil penelitian pada kecepatan 3,7 m/s; 5,5 m/s, 5,6 m/s 7,2 m/s; dan 7,8 m/s menunjukkan bahwa kinerja turbin paling tinggi pada kecepatan angin 5.6 m/s dengan efisiensi 39.84% dan daya 39.45 watt pada putaran poros 111 rpm.

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Tchakoua, Pierre, René Wamkeue, Mohand Ouhrouche, Ernesto Benini, and Gabriel Ekemb. "Electric Circuit Model for the Aerodynamic Performance Analysis of a Three-Blade Darrieus-Type Vertical Axis Wind Turbine: The Tchakoua Model." Energies 9, no. 10 (October 14, 2016): 820. http://dx.doi.org/10.3390/en9100820.

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The complex and unsteady aerodynamics of vertical axis wind turbines (VAWTs) pose significant challenges for simulation tools. Recently, significant research efforts have focused on the development of new methods for analysing and optimising the aerodynamic performance of VAWTs. This paper presents an electric circuit model for Darrieus-type vertical axis wind turbine (DT-VAWT) rotors. The novel Tchakoua model is based on the mechanical description given by the Paraschivoiu double-multiple streamtube model using a mechanical‑electrical analogy. Model simulations were conducted using MATLAB for a three-bladed rotor architecture, characterized by a NACA0012 profile, an average Reynolds number of 40,000 for the blade and a tip speed ratio of 5. The results obtained show strong agreement with findings from both aerodynamic and computational fluid dynamics (CFD) models in the literature.

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Mortel, Christian M., Nicanor L. Serrano, and John Gabriel G. Decena. "Optimization of Straight-bladed Darrieus type vertical axis wind blade for low wind speed." E3S Web of Conferences 211 (2020): 02008. http://dx.doi.org/10.1051/e3sconf/202021102008.

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Straight-bladed Darrieus blade is a type of vertical axis wind turbine that requires low wind speed to operate but is considered less efficient due to conventional blade geometry. To increase its performance by means of dynamic torque, the study used a statistical method, central composite design, through DesignExpert software. The computational fluid dynamics (CFD) through SolidWorks Reynolds-Averaged Navier Stokes Equation (RANS) k – epsilon turbulence model was used to simulate the Design of Experiments. The study was composed of two phases, namely 2D and 3D simulations. The 2D simulation studied the effect of varying the camber, camber location, and thickness to the dynamic torque, while the 3D simulation varied the blade height, rotor radius, and materials. The camber’s optimal conditions, camber location, and thickness in 2D simulations are 4.75%, 45%, and 15.50% of the chord, respectively. These optimal design values could reach the dynamic torque equivalent to 60.6571 Newton-meter. Meanwhile, the blade height and rotor radius of the 3D simulations have optimal design values of 4.41 meters and 4.75 meters, respectively. These optimal values could increase the dynamic torque to 2310.01 Newton-meter. The dynamic torque of the optimal design obtained a 133% significant increase compared to the conventional blade. Thus, the research has proven the increase in the Darrieus Wind turbine’s performance by varying its blade geometry.

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Gupta, R., A. Biswas, and K. K. Sharma. "Comparative study of a three-bucket Savonius rotor with a combined three-bucket Savonius–three-bladed Darrieus rotor." Renewable Energy 33, no. 9 (September 2008): 1974–81. http://dx.doi.org/10.1016/j.renene.2007.12.008.

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Journal articles on the topic 'Darrieus Rotor'

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