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Chatellenaz, Mario L., Juan M. Fernández et María Thomann. « Nuevos registros de Macropsalis forcipata, Cyanocorax caervlevs y Pyrodervs scvtatvs (aves : Aprimulgidae, Corvidae y Cotingidae) en el nordeste de la Provincia de Corrientes, Argentina ». FACENA 28 (16 novembre 2016) : 69. http://dx.doi.org/10.30972/fac.280903.
Texte intégralRésumé :
<p>El Distrito de los Campos de la Provincia Fitogeográfica Paranaense (Cabrera, 1976), comprende el sur de Misiones y nordeste de Corrientes. Este Distrito, con 401 especies de aves, es una de las áreas con mayor riqueza ornitológica de Argentina (Giraudo y Povedano, 2004). Se hacen presentes en Corrientes numerosas especies que tienen aquí su límite austral de distribución, y no se encuentran en otras áreas de la provincia (Darrieu Camperi, 1996). Dado que este Distrito es uno de los más modificados por acción antrópica en las últimas décadas, resulta imperativo que se tomen medidas tendientes a conservar su biodiversidad. En este sentido, el conocimiento de la distribución geográfica de las especies es de vital importancia, no sólo por el conocimiento en sí, sino porque brinda información útil para la conservación de las mismas. Por esto, se dan a conocer aquí nuevos registros de tres especies de aves en predios pertenecientes a la Empresa Las Marías S.A., en el departamento Santo Tomé, nordeste de la provincia de Corrientes.</p>
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Afifuddin, Fajar, Luthfi Hakim et Dicki Nizar Zulfika. « PERANCANGAN TURBIN VALVE SEBAGAI SUMBER ENERGI TERBARUKAN PADA LAJU ALIRAN FLUIDA DALAM PIPA ». SEMINAR NASIONAL FAKULTAS TEKNIK 1, no 1 (30 septembre 2022) : 233–37. http://dx.doi.org/10.36815/semastek.v1i1.40.
Texte intégralRésumé :
Pengembangan energi terbarukan harus digalakan untuk memenuhi kebutuhan energi secara swadaya. Jika masyarakat kecil bisa memiliki sumber energi sendiri, maka kemungkinan sumber energi yang dihasilkan oleh pembangkit tenaga besar dapat dialokasikan sepenuhnya pada kebutuhan industri, pendidikan dan lain sebagainya. Perancangan/pembuatan turbin air sumbuh vertical jenis darrius dengan memanfaatkan laju aliran fluida air dalam pipa, dan mengetahui pengaruh terhadap kecepatan laju aliran air/fluida terhadap peformasi turbin. Perancangan turbin valve sumbu vertikal dengan jenis Darrieus. Turbin memiliki 3 buah daun (blade) untuk menghubungkan antara blade dan poros. Poros turbin memiliki total panjang 135 mm. Blade terbuat dari bahan plat besi dengan lebar cord 22 milimeter dengan tinggi 135 milimeter. Blade memiliki ketebalan 2 mm Kecepatan aliran air yang akan memutar turbin direncanakan sebesar 1-5 m/s. ukuran rumah turbin memiliki panjang 260 mm, dengan diameter dalam 158 mm dan terdapat lubang sebesar 13 mm pada bagaian tengah yang berfungsi sebagai poros turbin
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Sahim, Kaprawi, Dyos Santoso et 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.
Texte intégralRésumé :
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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Wardani, Citra Sari, Dwi Anung Nindito et Allan Restu Jaya. « Inovasi Dan Desain Turbin Hidrokinetik Darrieus Berdasarkan Bentuk Distribusi Kecepatan Aliran ». Media Ilmiah Teknik Sipil 9, no 1 (1 décembre 2020) : 32–43. http://dx.doi.org/10.33084/mits.v9i1.1771.
Texte intégralRésumé :
Darrieus turbine use blades with a hydrofoil shape, so the rotational ability is influenced by lift force. This caused the initial rotation capability to be very low when compared to the drag turbine type. The flow velocity distribution in the vertical direction indicates a small cross-sectional speed of flow approaching the base of the flow channel, then rising towards the surface. Darrieus Spinning Top turbine is the result of innovation and design based on the concept of flow velocity distribution. Darrieus Spinning Top turbine’s blade shapes are circular-arc and straight-line, adjusting flow velocity distribution of 0.2H, 0.6H and 0.8H from the top of the turbine. In this study, a performance comparison was conducted between Darrieus turbine and Spinning Top Darrieus. Darrieus turbines produce RPM and torque values of 54.59 – 67.90 and 0.014 – 0.029 Nm, respectively. Darrieus Spinning Top turbines produce RPM values and torque of 69.24 – 82.02 and 0.012 – 0.020 Nm respectively. RPM improvements in Darrieus Spinning Top turbine design increase the influence of lift force (increased λ value). This results in a high lap rate, but requires a high self starting to perform the turbine rotation cycle.
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Kaprawi Sahim, Ilyas, Nurhadi, Dewi Puspita Sari, Imam Syofii, Muhammad Amsal Ade Saputra et Dendy Adanta. « Experimental Study of Darrieus Water Turbine Two Blade Different Configuration and Hybrid Turbine for Application of an Irrigation Flow ». Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 98, no 2 (29 septembre 2022) : 58–66. http://dx.doi.org/10.37934/arfmts.98.2.5866.
Texte intégralRésumé :
Rice fields are areas that have irrigation and rarely have lighting; this is dangerous at night because wild animals such as snakes are difficult to see. Irrigation has low-scale water energy with low-head conditions; hence the Darrieus and Savonius type water turbines are considered suitable for this condition. However, until now, there has been no comprehensive study of the feasibility of the two turbines for irrigation flow. Hence this study presents the experimental work to explore the performances of the Darrieus turbines Two Blade Different Configuration and hybrid Darrieus-Savonius turbine for irrigation flow. Accordingly, four configurations of the water turbines used in these investigations, i.e., Darrieus turbine with two different blades shape the aerofoil of NACA 0016 and NACA 0020, single Darrieus turbine with the aerofoil NACA 0016, single Savonius turbine, and hybrid Darrieus-Savonius turbine with the aerofoil NACA 0016. The mechanical power of the water turbines was measured using a rope brake dynamometer. The results show that the single Darrieus turbine with the aerofoil NACA 0016 has higher tip speed ratios but a lower torque coefficient than the single Savonius turbine. Then, hybrid Darrieus-Savonius turbine with the aerofoil NACA 0016, the maximum power coefficient lower than other. Furthermore, the single Savonius turbine has the highest power coefficient than the other. And the single Darrieus turbine with the aerofoil NACA 0016 shows that the turbine has higher torque than others. Thus, based on the results, a single Darrieus turbine with the aerofoil NACA 0016 is recommended for application.
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Shishkin, Nikolai, et 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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Mohan Kumar, Palanisamy, Mohan Ram Surya, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna et He Wei. « Computational Optimization of Adaptive Hybrid Darrieus Turbine : Part 1 ». Fluids 4, no 2 (17 mai 2019) : 90. http://dx.doi.org/10.3390/fluids4020090.
Texte intégralRésumé :
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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Puspitasari, Dewi, et 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 (30 décembre 2019) : 5832–47. http://dx.doi.org/10.15282/jmes.13.4.2019.09.0465.
Texte intégralRésumé :
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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Agustina, Lia, I. Made Susanto et I. Wayan Wawan Mariki. « PENGARUH PENGGUNAAN WIND GATE TERHADAP UNJUK KERJA TURBIN ANGIN DARRIEUS TIPE H ». Scientific Journal of Mechanical Engineering Kinematika 7, no 1 (18 juillet 2022) : 53–62. http://dx.doi.org/10.20527/sjmekinematika.v7i1.216.
Texte intégralRésumé :
Telah dilakukan karakterisasi terhadap turbin angin darrieus tipe H melalui pengukuran kecepatan angin dan kecepatan putaran rotor yang dapat digunakan untuk mengetahui unjuk kerja turbin angin yang optimal. Pengukuran kecepatan angin dilakukan dengan menggunakan anemometer. Pengukuran kecepatan putaran rotor menggunakan tachometer. Turbin angin yang dikarakterisasi dalam penelitian ini adalah turbin angin darrieus tipe H divariasikan menjadi turbin angin dengan menggunakan wind gate dan turbin angin tanpa wind gate. Hasil yang diperoleh dari penelitian ini adalah perbedaan nilai daya dan perbedaan nilai efisiensi dari turbin angin menggunakan wind gate dan tanpa wind gate tersebut. Nilai daya turbin angin maksimal dimiliki oleh turbin angin darrieus tipe H tanpa menggunakan wind gate yaitu mencapai daya 77,55 watt. Nilai efisiensi paling tinggi dimiliki oleh turbin angin darrieus tipe H dengan menggunakan wind gate yaitu mencapai 36,25%.
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Kadir, Muhammad Abdul. « PENGARUH SUDUT KEMIRINGAN DAN LEBAR SUDU TERHADAP KINERJA TURBIN DARRIEUS DENGAN PROFIL SUDU NACA 0021 ». KURVATEK 4, no 1 (25 juin 2019) : 7–13. http://dx.doi.org/10.33579/krvtk.v4i1.1135.
Texte intégralRésumé :
Abstract There are many low head hydro power energy resources potential in Indonesia that have not been optimally in use. The main obstacles is that this kind of turbines have low pawer factor and low efficiencies. One of the low head hydro power turbines is Darrieus turbin. The excellence of Darrieus turbine is its simply and has high strength blades. The verry important parameters that inflence to the turbine performance are width, angle of attack and cross section profile of the blades. The objective of the research is to investigate the influences of blades width and blades angle of attack to the Darrieus turbine performance that using NACA0021 cross section blades. The research has been conducted in a three blades 20 cm diameter 25 cm length Darrieus turbine model. The blades width variations are 5 cm and 6 cm, and angle of attack variations are 00, 50, and 100. It is concluded from the research that the turbine maximum power output is 0.54083 Watt, maximum efficiency is 40.94 %, and maximum power factor is 0.2579 %. These values are reached at 5 cm blades width and 50 angle of inclination.Keywords : Darrieus turbine, NACA 0021,angle of attack, power, performance.
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Mohan Kumar, Palanisamy, Krishnamoorthi Sivalingam, Teik-Cheng Lim, Seeram Ramakrishna et He Wei. « Strategies for Enhancing the Low Wind Speed Performance of H-Darrieus Wind Turbine—Part 1 ». Clean Technologies 1, no 1 (2 août 2019) : 185–204. http://dx.doi.org/10.3390/cleantechnol1010013.
Texte intégralRésumé :
Small wind turbines are key devices for micro generation in particular, with a notable contribution to the global wind energy sector. Darrieus turbines, despite being highly efficient among various types of vertical axis turbines, received much less attention due to their starting characteristics and poor performance in low wind speeds. Radically different concepts are proposed as a potential solution to enhance the performance of Darrieus turbine in the weak wind flows, all along the course of Darrieus turbine development. This paper presents a comprehensive review of proposed concepts with the focus set on the low wind speed performance and critically assessing their applicability based on economics, reliability, complexity, and commercialization aspects. The study is first of its kind to consolidate and compare various approaches studied on the Darrieus turbine with the objective of increasing performance at low wind. Most of the evaluated solutions demonstrate better performance only in the limited tip speed ratio, though they improve the low wind speed performance. Several recommendations have been developed based on the evaluated concepts, and we concluded that further critical research is required for a viable solution in making the Darrieus turbine a low speed device.
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Sahim, Kaprawi, Dyos Santoso et 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.
Texte intégralRésumé :
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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Wijaya, Rudi Kusuma, et Iwan Kurniawan. « Study Experimental Darrieus Type-H Water Turbines Using NACA 2415 Standard Hydrofoil Blade ». Jurnal Pendidikan Teknik Mesin Undiksha 9, no 2 (31 août 2021) : 109–23. http://dx.doi.org/10.23887/jptm.v9i2.29257.
Texte intégralRésumé :
Telah dilakukan kaji eksperimental turbin air Darrieus tipe-H menggunakan blade hydrofoil standar NACA 2415 untuk mengetahui nilai torsi statik dan dinamik yang dihasilkan turbin air Darrieus tipe-H 3 blade dan 6 blade, pengujian menggunakan water tunnel dimensi 6m x 0.6m x 1m. Variasi tiga blade dan enam blade, dengan diameter turbin 0.44 m x 0.15 m pada turbin luar dan 0.18 x 0.14 m pada turbin bagian dalam, panjang chord 0.10 m dengan variasi sudut serang 0º sampai dengan 360º, variasi kecepatan air pertama 0.3 m/s, variasi kecepatan aliran air kedua 0.65 m/s. Kecepatan air 0.3 m/s enam blade, torsi statik 0.3 Nm, torsi dinamik nya 0.384 Nm, kecepatan air 0,65 m/s torsi dinamik 0.432 Nm dan torsi statik nya 0.384 Nm, pengujian turbin Darrieus tiga blade kecepatan air 0,3 m/s nilai torsi dinamik 0.336 Nm dan dengan kecepatan yang sama torsi statik nya 0.264 Nm. Pada kecepatan air 0.65 m/s nilai torsi dinamik sebesar 0.384 Nm, dan nilai torsi statik 0.336 Nm. Dari data hasil pengukuran tersebut dapat disimpulkan bahwa variasi turbin enam blade memiliki nilai torsi statik dan torsi dinamik yang lebih tinggi dari pada turbin tiga blade, jumlah blade sangat berpengaruh terhadap daya serap energi kinetik air untuk di konversikan menjadi torsi statik maupun torsi dinamik.Kata kunci : Turbin Hydrokinetic, Darrieus, Torsi Statik,Torsi DinamikAn experimental study of the H-type Darrieus water turbine was carried out using a standard NACA 2415 hydrofoil blade to determine the value of static and dynamic torque generated by the 3-blade and 6-blade Darrieus H-type water turbine, testing using a water tunnel dimensions of 6m x 0.6m x 1m. Variation of three blades and six blades, with a turbine diameter of 0.44 mx 0.15 m on the outer turbine and 0.18 x 0.14 m on the inner turbine, chord length 0.10 m with variations in angle of attack 0º to 360º, variation of first water velocity 0.3 m / s second water flow velocity 0.65 m / s. Water velocity 0.3 m / s six blades, static torque 0.3 Nm, dynamic torque 0.384 Nm, water velocity 0.65 m / s dynamic torque 0.432 Nm and static torque 0.384 Nm, Darrieus three blade turbine test water speed 0.3 m / s dynamic torque value of 0.336 Nm and with the same speed its static torque is 0.264 Nm. At 0.65 m / s water velocity, the dynamic torque value is 0.384 Nm, and the static torque value is 0.336 Nm. From the measurement data, it can be concluded that the six-blade turbine variation has a higher value of static torque and dynamic torque than the three-blade turbine, the number of blades greatly influences the absorption of water kinetic energy to be converted into static torque and dynamic torque. Keywords: Hydrokinetic Turbine, Darrieus, static torque, dynamic torqueDAFTAR RUJUKANKirke, B.K. (2011). Tests on ducted and bare helical and straight blade Darrieus hydrokinetic turbines, 36, pp.3013-3022Dominy, R., Lunt, P., Bickerdyke A., Dominy, J. (2007). Self-starting capability of a Darrieus turbine. Proc Inst Mech Eng (IMechE) ePart A: J Power Energy ;221: 111-120Decoste, Josh. (2004). Self-Starting Darrieus Wind Turbine. Department of Mechanical Engineering, Dalhousie University.Febrianto, A., & Santoso, A. (2016). “Analisa Perbandingan Torsi Dan rpm Tipe Darrieus Terhadap Efisiensi Turbin”. Fakultas Teknologi Kelautan, Institut Teknologi Sepuluh Nopember (ITS)Febriyanto, N. (2014). “Studi Perbandingan Karakteristik Airfoil NACA 0012 Dengan NACA 2410 Terhadap Koefisien Lift dan Koefisien Drag Pada Berbagai Variasi Sudut Serang Dengan CFD” Fakultas teknik, Universitas Muhammadiyah SurakartaSaputra, G. (2016). Kaji Eksperimental Turbin Angin Darrieus-H Dengan Bilah Tipe NACA 2415. Universitas Riau, JOM Teknik Mesin vol. 3 No. 1.Hafied, B. (2018). Kaji Eksperimental Torsi Statik Dan Torsi Dinamik Hidrokinetik Turbin Savonius Single Stage Type Bach Tiga Sudu. Tugas Akhir Teknik Mesin. Fakultas Teknik Universitas Riau.Hau, E. (2005). Wind Turbines: Fundamentals, Technologies, Aplication, Economics. Springer. Berlin.Kaprawi. (2011), Pengaruh Geometri Blade Dari Turbin Air Darrieus Terhadap Kinerjany. Prosiding Seminar Nasional AVoER ke-3 PalembangKhan, M. J., Bhuyan, G., Iqbal M. T., & Quaicoe J.E. (2009). Hydrokinetic Energy Conversion Systems and Assessment of Horizontal and Vertical Axis Turbines for River and Tidal: Applications A Technology Status Review. Applied Energy, 86, 1823-1835.Lain, S., & Osario, C. (2010). Simulation and Evaluation of a Sraight Bladed Darrieus Type Cross Flow Marine Turbine. Journal of Scientific & Research, Vol. 69 p.906-912Marizka, L. D. (2010). Analisis Kinerja Turbin Hydrokinetic Poros Vertical Dengan Modifikasi Rotor Savonius L Untuk Optimasi Kinerja Turbin. Tugas Akhir Sains Fisika. FMIPA-Universitas Sebelas Maret.Malge, P. (2015).Analysis of Lift and Drag Forces at Different Azimuth Angle of Innovative Vertical Axis Wind Turbine.International Journal of Energy Engineering 4(5-8).Teja, P., D. (2017). Studi Numerik Turbin Angin Darrieus – Savonius Dengan Penambahan Stage Rotor Darrieus. Institut Teknologi Sepuluh Nopember, Surabaya.Zobaa, A. F., & Bansal, R. C. (2011). Handbook of Renewable Energy Technology. USA: World Scientific Publishing Co. Pte. Ltd.
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Qu, Jian Jun, Ming Wei Xu et Yi Mei. « Aerodynamic Model of Vertical Axis Wind Turbine with Wind Speed Self-Adapting in Drag-Mode ». Advanced Materials Research 347-353 (octobre 2011) : 340–43. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.340.
Texte intégralRésumé :
The structure of vertical axis wind turbine with wind speed-adapting is based on Darrieus straight-bladed turbine. It features that its blades are composed of movable and fixed blades. Through the opening and closing of the movable blades to adapt to the wind speed automatically, the turbine not only can start up in low wind speed, but also realize the conversion from drag-mode to lift-mode. Due to the special structure, the aerodynamic model of this turbine in drag-mode is different from that of Savonius and Darrieus turbine. So in this article, the aerodynamic model of this turbine in drag-mode is established. Then the coefficient of start-up torque is calculated and compared with that of Darrieus straight-bladed turbine which has the same size. The results show that the start-up performance of this turbine is obviously better than that of Darrieus straight-bladed turbine.
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Кауаn, V. « DARRIEUS TYPE WIND TURBINE WITH CONTROLLED BLADES ». Eurasian Physical Technical Journal 17, no 2 (24 décembre 2020) : 69–72. http://dx.doi.org/10.31489/2020no2/69-72.
Texte intégralRésumé :
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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Jorge Andrés Sierra Del Rio, Alejandro Ruiz Sánchez, Daniel Sanín Villa et Edwin Correa Quintana. « Numerical Study of H-Darrieus Turbine as a Rotor for Gravitational Vortex Turbine ». CFD Letters 14, no 8 (20 août 2022) : 1–11. http://dx.doi.org/10.37934/cfdl.14.8.111.
Texte intégralRésumé :
The main objetive of this study is to compare numerically the torque generated at 50, 75, 100, and 125 rpm by H-Darrieus turbine as a rotor for Gravitational Vortex Turbine. The rotational flow into the gravitational vortex turbine tank helped to decrease the negative torque in H-Darrieus rotor. The study was developed in ANSYS® CFX, where the model was configured at constant operating conditions. The highest torque was 0.117 Nm at 50 rpm, and the torque decreased with increasing rpm. The H-Darrieus works with increasing lift force, however, the rotor inside the Gravitational Vortex Turbine interacts with drag force.
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Sahim, Kaprawi, Kadafi Ihtisan, Dyos Santoso et 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.
Texte intégralRésumé :
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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Wicaksono, Hangga, Sugeng Hadi Susilo, Bayu Pranoto et Muhammad Fakhruddin. « Initial Rotation Characteristic Investigation of a Hybrid Savonius - Darrieus Wind Turbine using 6 DOF Computational Fluid Dynamics ». Mekanika : Majalah Ilmiah Mekanika 20, no 1 (31 mars 2021) : 9. http://dx.doi.org/10.20961/mekanika.v20i1.47577.
Texte intégralRésumé :
The inconsistency of the wind flow considered as one of the factors which tend to decrease the performance of the wind turbine. This paper proposes a further analysis of the initial rotation characteristic of a hybrid Savonius - Darrieus wind turbine. The addition of the Darrieus blade intends to increase the aerodynamic stability of the overlapping Savonius turbine. This study implements 2D CFD transient analysis using the 6DOF methods in 0<sup>0</sup>, 30<sup>0</sup>, 60<sup>0</sup>, and 90<sup>0</sup> Darrieus blade position along with 2 m/s, 4 m/s, and 6 m/s wind speed variations. The results of the aerodynamic analysis show that the location of the Darrieus 30<sup>0</sup> turbine provides the greatest initial repulsion, especially when the turbine rotation is above 90<sup>0</sup>, the position of the Darrieus blade can provide additional impulse force when the Savonius turbine tends to be passive. This effect occurs more significant at higher wind speeds. Savonius with 3-blade modification has a more stable level of force distribution than the 2-blade modification, although the value is smaller. This shows that the 3-blade Savonius provide a higher stability of angular velocity development.
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Octauria, Emilia Putri, Dwi Anung Nindito et Raden Haryo Saputra. « UJI EKSPERIMENTAL PENGARUH SUDUT OMNI DIRECTIONAL GUIDE VANES TERHADAP PERFORMA TURBIN HIDROKINETIK DARRIEUS ». Eksergi 17, no 2 (31 mai 2021) : 95. http://dx.doi.org/10.32497/eksergi.v17i2.2581.
Texte intégralRésumé :
<p>Energi terbarukan bisa digunakan sebagai solusi mengurangi ketergantungan pada bahan bakar fosil dengan cara menggunakan sumber hidroelektrik seperti penggunaan turbin vertikal berjenis Darrieus. Turbin Darrieus memiliki kelemahan yaitu kesulitan memulai awal putaran (<em>self starting</em>) pada rotornya karena berbasis gaya angkat. Studi ini menyelidiki pengaruh penambahan pengarah <em>Omni Directional Guide Vanes</em> (ODGV) dengan jumlah <em>guide vanes</em> dan besar sudut berbeda-beda terhadap turbin Darrieus dengan tujuan dapat menekan kelemahannya. Studi ini menggunakan turbin Darrieus 2 (dua) airfoil dan 3 (tiga) airfoil dengan profil NACA 0012 untuk diujikan di aliran air pada saluran prismatik. Hasil uji eksperimental menunjukkan bahwa penggunaan pengarah dengan perbandingan 1/6 celah ODGV (6 <em>guide vanes</em>) dan sudut 0º mengakibatkan bertambahnya nilai <em>Coefficient of Power </em> (C<sub>p</sub>) dan nilai <em>Tip Speed Ratio</em> (TSR), sehingga mampu meningkatkan Cp rata-rata lebih besar 34,25% dari turbin Darrieus konvensional. Namun seiring bertambahnya jumlah <em>guide vanes</em> dan besar sudut membuat performa turbin menurun. Pengarah ODGV mampu meningkatkan nilai TSR sehingga dapat mengoptimalkan gaya angkat pada turbin.</p>
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Riady, Muhammad Ihsan, Dyos Santoso, Bazlina Dawami Afrah, Juliet Patricia Arsadha, Rupinder Rupinder et Miftahurrizka Afrah. « Studi eksperimental turbin angin kombinasi sumbu vertikal darrieus-savonius dengan poros kembar ». Jurnal Teknik Kimia 28, no 1 (1 mars 2022) : 28–36. http://dx.doi.org/10.36706/jtk.v28i1.975.
Texte intégralRésumé :
Energi angin merupakan salah satu sumber energi terbarukan yang melimpah di Indonesia. Potensi angin yang besar ini dapat dimanfaatkan dengan menggunakan turbin angin sebagai teknologi yang ramah lingkungan. Turbin angin Savonius dan turbin angin Darrieus merupakan turbin angin sumbu vertikal yang sesuai dengan karakteristik angin yang tersedia. Pada penelitian ini, turbin Darrieus dikombinasikan dengan turbin Savonius dalam rangka memperbaiki kemampuan self-starting turbin tersebut. Untuk mendapatkan performansi turbin yang lebih baik, daya yang dihasilkan oleh turbin Savonius juga dimanfaatkan sehingga tidak semata-mata berfungsi sebagai perangkat starting saja. Untuk tujuan itu, rotor Savonius dipasang pada poros dengan menggunakan one way bearing sehingga masing-masing rotor dapat beroperasi secara terpisah dan memiliki kecepatan putaran yang berbeda. Profil sudu yang digunakan dalam penelitian ini adalah airfoil NACA 0018 untuk rotor Darrieus dan modifikasi airfoil e377-il untuk rotor Savonius. Tujuan utama penelitian ini adalah mengevaluasi peningkatan peformansi yang diperoleh pada kombinasi turbin Darrieus Savonius poros kembar bila dibandingkan dengan kombinasi poros tunggal. Pada kombinasi poros tunggal, rotor Savonius terpasang tetap pada poros turbin Darrieus dan hanya digunakan sebagai starting, sedangkan pada kombinasi poros kembar, daya yang dihasilkan oleh kedua rotor dimanfaatkan. Hasil dari pengujian ini memperlihatkan bahwa daya yang dibangkitkan oleh kombinasi poros kembar mengalami peningkatan yang signifikan dibandingkan oleh kombinasi poros tunggal yaitu sebesar 28.54% (0.528 W) pada kecepatan angin 4.38 m/s.
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Eftekhari, Hesam, Abdulkareem Sh Mahdi Al-Obaidi et Shahrooz Eftekhari. « Aerodynamic Performance of Vertical and Horizontal Axis Wind Turbines : A Comparison Review ». Indonesian Journal of Science and Technology 7, no 1 (16 décembre 2021) : 65–88. http://dx.doi.org/10.17509/ijost.v7i1.43161.
Texte intégralRésumé :
The need for energy and electricity has been increasing globally, and this means more power is required from the power plants. Power plants, however, will then continue harming the earth because of the greenhouse gasses produced while generating energies that contribute to global warming. Using renewable sources to produce clean energies is one of the sustainable methods to deal with such challenges. Wind energy is one of the renewable sources, which is accessible anywhere on earth, creating green energy. Wind turbines are mainly categorized into Horizontal Axis Wind Turbines (HAWT) and Vertical Axis Wind Turbines (VAWT). This paper firstly presents a general comparison between the HAWTs and VAWTs. Then, it presents mathematical modelling for the aerodynamic factors of HAWT and Darrieus VAWT to assist the researchers to understand some key design aspects of wind turbines, such as lift/drag ratio, tip speed ratio, power coefficient, and torque coefficient. Also, this paper presents a review of the aerodynamic performance of the recent VAWT designs to help researchers to identify and choose the best model among the Savonius and Darrieus rotors for further development or designing a new model at different wind conditions. This comparison review shows that for a large scale HAWT upwind 3 bladed wind turbines are the most optimum. The helical Savonius rotors perform better by having positive torque coefficient at all azimuth angles. Moreover, helical Darrieus was found to produce lesser noise and suitable for conventional areas. hybrid Savonius-Darrieus rotors can solve the self-starting challenge of the VAWTs, and they are suitable at low wind speeds. At last, this review shows some of the recent hybrid Savonius-Darrieus rotors which would help to solve the low efficiency of Savonius rotor and self-starting challenge of Darrieus rotors.
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Chua, Bih Lii, Mohd Suffian Misaran, Yan Yan Farm, Mizanur Rahman et Benjoe Eldana Barahim. « Development of Mixed Vertical Axis Wind Turbine (MVAWT) for Low Wind Condition ». Applied Mechanics and Materials 660 (octobre 2014) : 811–15. http://dx.doi.org/10.4028/www.scientific.net/amm.660.811.
Texte intégralRésumé :
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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Diaurahman, Diaurahman, et Rudi Siswanto. « PERENCANAAN KONSTRUKSI DAN ELEMEN MESIN TURBIN ANGIN SUMBU VERTIKAL TYPE DARRIEUS ». Scientific Journal of Mechanical Engineering Kinematika 1, no 2 (9 juin 2016) : 99–112. http://dx.doi.org/10.20527/sjmekinematika.v1i2.30.
Texte intégralRésumé :
Wind energi is one of the alternative energi that can be utilized for various purposes to replace the source of fossil fuel energi. The Darrieus wind turbine includes a vertikal axis wind turbine driven by lifting force from the blade. Planning of the axis vertikal type Darrieus wind turbine is aimed to calculate the elements of Darrieus machine and make design of vertikal axis component of Darrieus vertikal turbine using Marzuki (2016) research data about NACA 2415 blend analysis with variation of blade and angle of attack. The planning method used is based on the calculation of construction and vertikal axis of vertikal axis type of wind machine by using field result data in the form of wind speed, altitude and environmental condition which produce calculation result and working drawing of each machine element. The results of planning engine eleman on vertikal axis wind turbine Darrieus with 3 pieces airfoil shaped type NACA 2415 chord 30 cm has a diameter and height of 1 meter. Using ST-42 shaft 17-25 mm in diameter with length 1640 mm retained 2 bearing pieces with numbers 30203 and 6204. Transmission using belt and pulley type with 1: 14 increase ratio. Frame using Lx steel profile size 30x30 with total length ± 15 m. The use of materials such as composites is preferable to reduce turbine load without affecting the strength and durability of the turbine.
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Trifiananto, Muhammad, Irvan Septianto Putra et Mochamad Edoward Ramadhan. « ANALISIS PERFORMA TURBIN ANGIN VAWT (VERTICAL AXIS WIND TURBINE) TIPE HYBRID SAVONIUS DARRIEUS NACA 4712 ». ROTOR 15, no 1 (29 avril 2022) : 1. http://dx.doi.org/10.19184/rotor.v15i1.29099.
Texte intégralRésumé :
A wind turbine is a device that converts wind energy into mechanical energy to produce electric power. Wind turbines have a simple working principle, which is to convert wind energy into mechanical energy in the windmill, then the rotation of the turbine0makes the rotor on the generator rotate and generate electricity. There are 2 types of wind turbines: vertical axis wind turbine and horizontal axis wind turbine. This study aims to determine the performance of the medium-scale VAWT hybrid savonius darrieus NACA 4712 wind turbine. The hybrid wind turbine is a combination of savonius and darrieus wind turbines to increase efficiency by utilizing the drag of the savonius turbine and lift force from the darrieus wind turbine. This study used an experimental method. The fan is used to vary the wind speed. The wind speed used ranges from 5, 5.5, 6, 6.5, 7, 7.1,7.2,7.3 m/s. This savonius darrieus hybrid wind turbine can produce efficiency of 0.037 at wind speed of 5 m/s with an initial torque of 0.088 N/m. The maximum rotation in this hybrid turbine study 118 Rpm was obtained at a wind speed of 7.3 m/s.
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Zhang, Runqiang, Zhenwei Huang, Lei Tan, Yuchuan Wang et Erqi Wang. « Energy Performance and Radial Force of Vertical Axis Darrieus Turbine for Ocean Energy ». Energies 13, no 20 (16 octobre 2020) : 5412. http://dx.doi.org/10.3390/en13205412.
Texte intégralRésumé :
Vertical axis Darrieus turbine is the key component for ocean energy conversion and utilization. In the present work, the energy performance, flow pattern, and radial force for a vertical axis Darrieus turbine were investigated. The experimental measurements and numerical simulations were in good agreement, which validates the accuracy and reliability of the numerical method. The results showed that the power coefficient gradually increased with the increase of tip speed ratio λ, and the power coefficient had three peaks in a revolution of runner due to three blades. The complex vortex induced by the turbine revolution mainly includes the blade tip vortex and blade surface vortex, which are related to the turbine rotation and flow separation on blade surface. The vorticity transport equation was first introduced to analyze the mechanism and evolution of vortex in a vertical axis Darrieus turbine, and the results revealed that the relative vortex elongation term is the main driving force for the formation and development of the blade surface vortex. The radial force of the Darrieus turbine gradually increases with the increase in tip speed ratio, and it is symmetrical with three humps due to three blades.
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Hakim, Luthfi, Achmad Rijano et Mochamad Muzaki. « Analisis Regresi Kecepatan Angin Terhadap Daya Turbin Angin Jenis VAWT Tipe Darrieus-Savonius ». Jurnal Energi dan Teknologi Manufaktur (JETM) 1, no 02 (31 décembre 2018) : 15–20. http://dx.doi.org/10.33795/jetm.v1i02.16.
Texte intégralRésumé :
The Darrieus-Savonius (DS) wind turbine has been widely developed with the aim of improving turbine performance that has been designed. DS wind turbine is a combination of two type of wind turbines, that is Darrieus and Savonius turbine, both turbines are intentionally developed In order to get self-starting on turbine Savonius with low wind speed and able to extract the speed of engine into energy well at high wind speed through Cherrie Darrieus. This study was conducted to analyze the performance of the DS turbine in the wind speed to be energized through the turbine rotation and power to be generated. The DS wind turbine is designed to start rotating at a speed of 8 m/s in velocity of wind, meanwhile the maximum power generated by turbine is 48,23 Watts.
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Effendi, Rian, et Rudi Siswanto. « PROSES MANUFAKTUR TURBIN ANGIN SUMBU VERTIKAL TIPE DARRIEUS ». JTAM ROTARY 1, no 2 (1 septembre 2019) : 117. http://dx.doi.org/10.20527/jtam_rotary.v1i2.1742.
Texte intégralRésumé :
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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Alqurashi, Faris, et M. H. Mohamed. « Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine ». Modelling and Simulation in Engineering 2020 (11 janvier 2020) : 1–15. http://dx.doi.org/10.1155/2020/1368369.
Texte intégralRésumé :
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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Sellier, Geneviève. « Danielle Darrieux (1917-2017) ». Hermès 80, no 1 (2018) : 307. http://dx.doi.org/10.3917/herm.080.0307.
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Bachtiar, Bachtiar, et Nopem Ariwiyono. « STUDI NUMERIK PENGARUH PERUBAHAN OBSTACLE SEGITIGA TERPASANG DI DEPAN RETURNING BLADE TERHADAP KINERJA DARRIEUS WIND TURBINE TIPE NACA 0015 ». INOVTEK POLBENG 9, no 1 (3 juillet 2019) : 79. http://dx.doi.org/10.35314/ip.v9i1.905.
Texte intégralRésumé :
Angin merupakan salah satu sumber renewable terbaik dengan ketersediaan yang sangat melimpah. Penelitian ini menambahkan obstacle segitiga sama sisi diletakkan di depan sisi returning blade pada turbin Darrieus. Obstacle segitiga di depan returning blade diduga akan menurunkan drag sisi sudu returning blade dengan konsekuensi akan menurunkan torsi negatif dan akibatnya akan meningkatkan torsi total dan daya turbin Darrieus. Penelitian ini menggunakan metode numerik dengan menggunakan foil NACA 0015, panjang chord 20 cm, diameter Darrieus berukuran 800 cm, kecepatan angin 3 m/s. Penelitian dilakukan dengan memvariasikan jarak obstacle y = 20 cm, 40 cm dan 60 cm. Simulasi numerik menggunakan moving mesh dengan jenis turbulence model Reliazible k-epsilon (RKE). Simulasi numerik melakukan ploting terhadap koefisien torsi (Cm) dan koefisien daya (Cp) Hasil dari penelitian ini menunjukkan bahwa kinerja terbaik pada y = 60 cm dengan maksimum koefisien daya sebesar 0,377 pada TSR 1,535 atu meningkat sekitar 7,08%.
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Fadila, Anis, et Ilham Zakaria. « Rancang Bangun Turbin Angin Tipe Darrieus Tiga Sudu Rangkap Tiga dengan Profil NACA 0006 ». Eksergi 15, no 3 (17 février 2020) : 102. http://dx.doi.org/10.32497/eksergi.v15i3.1785.
Texte intégralRésumé :
<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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Paraschivoiu, Ion, Shahrokh Shams et Norbert V. Dy. « Performance assessment of Darrieus wind turbines with symmetric and cambered airfoils ». Transactions of the Canadian Society for Mechanical Engineering 42, no 4 (1 décembre 2018) : 382–92. http://dx.doi.org/10.1139/tcsme-2017-0105.
Texte intégralRésumé :
During the operation of a Darrieus type vertical axis wind turbine (VAWT), the blade sections are subjected to different flow velocities and incidences that can be converted to mechanical power with varying efficiency depending on the airfoil. The goal of the present study is to emphasize the advantages and the drawbacks of the use of symmetrical, cambered, and laminar airfoil for a typical Darrieus type VAWT. The NACA 0018, FX63-137 and SNLA 18/50 airfoils were selected for this study.
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Arief, Arfian, Irham Magamar Siregar et Suwarno Suwarno. « Analisa Regresi Kecepatan Angin Terhadap Daya Turbin Angin VAWT Tipe Darrieus-Savonius di Kualanamu Sumatera Utara ». Jurnal MESIL (Mesin Elektro Sipil) 1, no 2 (8 décembre 2020) : 74–80. http://dx.doi.org/10.53695/jm.v1i2.99.
Texte intégralRésumé :
Efektivitas penggunaan energi angin sangat tergantung pada desain turbin angin yang digunakan. Turbin angin mampu menghasilkan energi dari hembusan angin secara optimal jika desain turbin yang digunakan benar.Turbin angin Darrieus-Savonius (DS) telah banyak banyak dikembangkan dengan tujuan untuk meningkatkan kinerja turbin yang telah dirancang. Turbin angina DSmerupakan gabungan dari dua jenis turbin angina, yaitu turbin Darrieus-Savonius, kedua turbin tersebut sengaja dikembangkan agar dapat memulai dengan kecapatan angina rendah dan mampu mengektraksi kecepatan mesin menjadi energy dengan baik dengan kecepatan angina tinggi melalui Cherrie Darrieus. Peneltian ini dilakukan untuk menganalisis performa turbin DS pada kecepatan angin yang akan diberi energy melalui putaran turbin dan daya yang akan di bangkitkan. Turbin angin DS dirancang untuk mulai berputar dengan kecepatan 8,7 m/s dengan kecepatan angina, sedangkan Cp maksimum yang dihasilkan oleh turbin adalah 0,4. Data dihasilkan dari percobaan kecepatan angina dan jumlah putaran turbin, kemudian data tersebut dianalisis menggunakan metode statistic untuk mendapatkan persamaan regresi.
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Torabi Asr, Mahdi, Reza Osloob et Faizal Mustapha. « Double-Stage H-Darrieus Wind Turbine - Rotor Aerodynamics ». Applied Mechanics and Materials 829 (mars 2016) : 21–26. http://dx.doi.org/10.4028/www.scientific.net/amm.829.21.
Texte intégralRésumé :
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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Alfian, Mizar, Poppy Puspitasari, Ahmad Taufiq, Muhammad Trifiananto et 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.
Texte intégralRésumé :
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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Saryazdi, Seyed Mohammad E., et Mehrdad Boroushaki. « 2D Numerical Simulation and Sensitive Analysis of H-Darrieus Wind Turbine ». International Journal of Renewable Energy Development 7, no 1 (18 février 2018) : 23. http://dx.doi.org/10.14710/ijred.7.1.23-34.
Texte intégralRésumé :
Recently, a lot of attention has been devoted to the use of Darrieus wind turbines in urban areas. The aerodynamics of a Darrieus turbine are very complex due to dynamic stall and changing forces on the turbine triggered by changing horizontal angles. In this study, the aerodynamics of H-rotor vertical axis wind turbine (VAWT) has been studied using computational fluid dynamics via two different turbulence models. Shear stress transport (SST) k-ω turbulence model was used to simulate a 2D unsteady model of the H-Darrieus turbine. In order to complete this simulation, sensitivity analysis of the effective turbine parameters such as solidity factor, airfoil shape, wind velocity and shaft diameter were done. To simulate the flow through the turbine, a 2D simplified computational domain has been generated. Then fine mesh for each case consisting of different turbulence models and dimensions has been generated. Each mesh in this simulation dependent on effective parameters consisted of domain size, mesh quality, time step and total revolution. The sliding mesh method was applied to evaluate the unsteady interaction between the stationary and rotating components. Previous works just simulated turbine, while in our study sensitivity analysis of effective parameters was done. The simulation results closely match the experimental data, providing an efficient and reliable foundation to study wind turbine aerodynamics. This also demonstrates computing the best value of the effective parameter. The sensitivity analysis revealed best value of the effective parameter that could be used in the process of designing turbine. This work provides the first step in developing an accurate 3D aerodynamic modeling of Darrieus wind turbines.Article History: Received :August 19th 2017; Received: December 15th 2017; Accepted: Januari 14th 2018; Available onlineHow to Cite This Article: Saryazdi, S. M. E. and Boroushaki, M. (2018) 2D Numerical Simulation and Sensitive Analysis of H-Darrieus Wind Turbine. Int. Journal of Renewable Energy Development,7(1),23-34https://doi.org/10.14710/ijred.7.1.23-24
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Iliev, Rossen. « A CFD analysis of the performance characteristics of different Darrieus turbine runners ». E3S Web of Conferences 207 (2020) : 02012. http://dx.doi.org/10.1051/e3sconf/202020702012.
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This paper presents the capabilities of analyzing different Darrieus wind turbine runners with the computer program Ansys Fluent. A K-omega turbulence model was used in the case of a two-dimensional flow with a suitable computational grid around the profile of the blades. The obtained theoretical performance characteristics were validated on test rig №7 (Wind Turbines) in the Laboratory of Hydropower and Hydraulic Turbomachinery (HEHT Lab) at the Technical University of Sofia. The data analysis shows that it’s possible to predict the performance characteristic and the optimum operating regime of the Darrieus wind turbine.
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Sulistyono, Sulistyono, Elka Faizal et Alfi Tranggono Agus Salim. « Pengaruh Variasi Radius Sudu Turbin Angin Darrieus Tipe Sudu-J ». Jurnal Energi dan Teknologi Manufaktur (JETM) 3, no 02 (31 décembre 2020) : 15–18. http://dx.doi.org/10.33795/jetm.v3i02.65.
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Utilization of alternative energy, therefore this wind turbine is used as an alternative energy power plant. So this experimental study is used to determine how much influence on the performance of the Darrieus type J-blade vertical shaft wind turbine by varying the blade radius. The method used is a true experimental research method. The independent variables in this study are variations in wind speed of 3, 4, 5, 6, and 7 m / s. The dependent variable in this research is shaft power and efficiency. Then the controlled variables in this study were the number of blades 3 and the front radius of the blade: 5, 10, and 15 mm. The test results and data processing shows that the blade radius of the Darrieus J-blade type of wind turbine affects the performance of the Darrieus J-blade type wind turbine. In testing the highest value was achieved at a blade radius of 15 mm with a wind speed of 7 m / s, namely the shaft power value of 0.323 Watt and the efficiency value of 4.673%.
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Ramlee, Muhamad Fadhli, Ahmad Fazlizan et 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 (1 février 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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Toshiharu, Kosaku, Atsuumi Keita, Haruyama Yukihiro, Hanafi Muhammad, Sano Manabu et Kawaguchi Kiyoshi. « 1144 MEASUREMENT OF AERODYNAMIC FORCES ON BLADES IN DARRIEUS MOTION ». Proceedings of the International Conference on Jets, Wakes and Separated Flows (ICJWSF) 2013.4 (2013) : _1144–1_—_1144–6_. http://dx.doi.org/10.1299/jsmeicjwsf.2013.4._1144-1_.
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Le, Hieu Thi Hong, Cong Chi Nguyen et Trong Huu Luong. « Performance prediction of Darrieus vertical axis wind turbines using double multiple stream-tube model ». Science and Technology Development Journal 18, no 4 (30 décembre 2015) : 153–61. http://dx.doi.org/10.32508/stdj.v18i4.1001.
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Horizontal and vertical axis wind turbines (HAWTs and VAWTs) are two main kinds of wind turbines, which are the most popular way to catch energy from the wind. By comparison, VAWTs have some advantages, but they also have the complexity in aerodynamics that needs a deep investigation. A code is developed based on Double multiple stream-tube and corrections of the dynamic stall for Darrieus VAWTs. It is capable of estimating the output power versus different operating conditions defined by the tipspeed- ratio. The code is also validated with experimental data of many SANDIA Darrieus VAWT turbines.
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Sahin, Kaprawi, et Fajri Prawira. « Studi Eksperimental Turbin Darrieus Dengan Sudu Overlap ». Jurnal Rekayasa Mesin 20, no 1 (1 mars 2020) : 7–14. http://dx.doi.org/10.36706/jrm.v20i1.208.
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Saat ini energi listrik merupakan kebutuhan primer manusia. Energi angin merupakan alternatif yang tepat untuk dimanfaatkan sebagai sumber energi. Turbin angin Darrieus merupakan turbin angin yang tepat karena mampu menyerap daya lebi baik dibandingkan turbin angin lainnya. Namun, turbin ini efektif bekerja pada kecepatan angin yang tinggi. Untuk mengetasi hal tersebut, overlap pada sudu dapat menjadi alternatif. Metode eksperimen digunakan karena lebih dapat dipercaya dibandingkan metode lainnya. Dari hasil pengujian turbin angin Darrieus menggunakan overlap dapat menjadi alternatif karena turbin dapat bekerja pada kecepatan angin yang rendah. Semakin besar torsi suatu putaran, maka daya yang dihasilkan cukup tinggi.
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Weber, Johannes, Stefan Becker, Christoph Scheit, Jens Grabinger et Manfred Kaltenbacher. « Aeroacoustics of Darrieus Wind Turbine ». International Journal of Aeroacoustics 14, no 5-6 (octobre 2015) : 883–902. http://dx.doi.org/10.1260/1475-472x.14.5-6.883.
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KIRKE, Brian, et Leo LAZAUSKAS. « Variable Pitch Darrieus Water Turbines ». Journal of Fluid Science and Technology 3, no 3 (2008) : 430–38. http://dx.doi.org/10.1299/jfst.3.430.
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Ponta, Fernando L., Alejandro D. Otero et Lucas Lago. « The VGOT Darrieus wind turbine ». International Journal of Global Energy Issues 21, no 3 (2004) : 303. http://dx.doi.org/10.1504/ijgei.2004.005774.
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Tjiu, Willy, Tjukup Marnoto, Sohif Mat, Mohd Hafidz Ruslan et Kamaruzzaman Sopian. « Darrieus vertical axis wind turbine for power generation I : Assessment of Darrieus VAWT configurations ». Renewable Energy 75 (mars 2015) : 50–67. http://dx.doi.org/10.1016/j.renene.2014.09.038.
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Ikhwan, N., T. Y. Yuwono, A. Wikarta, A. P. Harendsa, D. A. Pratama, D. A. Sekarrini, D. A. Fatjrin et G. A. Nurbawono. « Structural Strength Study for Vertical Axis Hydrokinetic Turbine Frame ». IOP Conference Series : Earth and Environmental Science 1081, no 1 (1 septembre 2022) : 012045. http://dx.doi.org/10.1088/1755-1315/1081/1/012045.
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Abstract One of the renewable energy sources is ocean currents which can be extracted with the Darrieus vertical axis hydrokinetic turbine (VAHT). This research aims to analyze the deformation and structural stresses that occur in the Darrieus VAHT support frame due to the loads. In the VAHT installation, it is necessary to have a support structure in the form of a solid frame, so that the turbine remains in a stable condition when operating. The VAHT frame must be able to withstand the load from a rotating turbine and have a small drag force. This study conducted a numerical simulation using the finite element analysis method. The effect of the cross-sectional shape of the structural beams on the drag due to flow was also investigated. The result is the frame designed with the ASTM A36 Grade B pipe structure has maximum stress of 63,116 MPa and it is relatively smaller and remains within the safe limits of the material. In addition, based on CFD simulation, the drag caused by the flow across the structure with this design is also smaller. Therefore, this study can be used as a consideration in making decisions to design the Darrieus VAHT frame.
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Hamdani, Wahyu, Himsar Ambarita, Tulus B. Sitorus, Dian M. Nasution et Terang UHS Ginting. « SIMULASI PENGARUH JUMLAH SUDU TERHADAP PERFORMANSI TURBIN ANGIN TIPE DARRIEUS-H DENGAN PROFIL SUDU NACA 0018 MENGGUNAKAN SOFTWARE CFD ». DINAMIS 4, no 1 (1 mars 2016) : 9. http://dx.doi.org/10.32734/dinamis.v4i1.7016.
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Turbin angin merupakan mesin dengan sudu berputar yang mengkonversikan energi kinetik angin menjadi energi mekanik. Turbin angin sumbu vertikal tipe Darrieus-H merupakan pengembangan dari turbin angin Darrieus. Penelitian yang telah dilakukan para peneliti sebelumnya secara eksperimen menunjukkan hasil berupa efisiensi yang dihasilkan dari turbin angin Darrieus-H ini sangat kecil. Nilai ini tidak sebanding dengan biaya pabrikasi yang cukup mahal. Banyak faktor yang mempengaruhi efisiensi turbin angin ini yaitu pengaturan sudut pitch, diameter rotor turbin, tinggi sudu, panjang chord sudu dan massa turbin itu sendiri. Biaya pabrikasi yang mahal tidak efisien untuk meneliti keseluruhan variabel tersebut maka perlu dilakukan simulasi dengan menggunakan komputer. Tujuan dari penelitian ini untuk mengetahui pengaruh variasi jumlah sudu terhadap performansi turbin angin dengan mensimulasikannya dengan menggunakan software CFD. Turbin angin yang disimulasi berupa rotor 2D dengan diameter 1,50 m pada daerah rotating region. Airfoil yang dipakai adalah NACA 0018. Variasi jumlah sudu yang digunakan adalah 3, 4, 5, dan 6 buah. Hasil simulasi menunjukkan efisiensi untuk jumlah sudu 5 buah pada tip speed ratio 1.8 memiliki efisiensi tertinggi yaitu 58.941 %. Perbedaan yang terjadi antara hasil eksperimen dan simulasi disebabkan karena adanya kerugian yang terjadi pada saat pengujian.
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Mertens, Sander, Gijs van Kuik et Gerard van Bussel. « Performance of an H-Darrieus in the Skewed Flow on a Roof1 ». Journal of Solar Energy Engineering 125, no 4 (1 novembre 2003) : 433–40. http://dx.doi.org/10.1115/1.1629309.
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Application of wind turbines on roofs of higher buildings is a subject of increasing interest. However, the wind conditions at the roof are complex and suitable wind turbines for this application are not yet developed. This paper addresses both issues: the wind conditions on the roof and the behavior of a roof-located wind turbine with respect to optimized energy yield. Vertical Axis Wind Turbines (VAWTs) are to be preferred for operation in a complex wind environment as is found on top of a roof. Since the wind vector at a roof is not horizontal, wind turbines on a roof operate in skewed flow. Thus the behavior of an H-Darrieus (VAWT) is studied in skewed flow condition. Measurements showed that the H-Darrieus produces an increased power output in skewed flow. The measurements are compared with a model based on Blade Element Momentum theory that also shows this increased power output. This in contradiction to a HAWT in skewed flow which suffers from a power decrease. The paper thus concludes that due to this property an H-Darrieus is preferred above the HAWT for operation on a flat roof of higher buildings.
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Sineglazov, Victor, et Oleksandr Stanislavchuk. « Automation Disign of Hybrid Vertical-axial Rotors ». Electronics and Control Systems 4, no 70 (1 avril 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.