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Добірка наукової літератури з теми "Darrieu"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Darrieu"

1

Chatellenaz, Mario L., Juan M. Fernández, and 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 (November 16, 2016): 69. http://dx.doi.org/10.30972/fac.280903.

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<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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2

Afifuddin, Fajar, Luthfi Hakim, and Dicki Nizar Zulfika. "PERANCANGAN TURBIN VALVE SEBAGAI SUMBER ENERGI TERBARUKAN PADA LAJU ALIRAN FLUIDA DALAM PIPA." SEMINAR NASIONAL FAKULTAS TEKNIK 1, no. 1 (September 30, 2022): 233–37. http://dx.doi.org/10.36815/semastek.v1i1.40.

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Анотація:

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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3

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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Анотація:

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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4

Wardani, Citra Sari, Dwi Anung Nindito, and Allan Restu Jaya. "Inovasi Dan Desain Turbin Hidrokinetik Darrieus Berdasarkan Bentuk Distribusi Kecepatan Aliran." Media Ilmiah Teknik Sipil 9, no. 1 (December 1, 2020): 32–43. http://dx.doi.org/10.33084/mits.v9i1.1771.

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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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5

Kaprawi Sahim, Ilyas, Nurhadi, Dewi Puspita Sari, Imam Syofii, Muhammad Amsal Ade Saputra, and 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 (September 29, 2022): 58–66. http://dx.doi.org/10.37934/arfmts.98.2.5866.

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Анотація:

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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6

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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7

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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Анотація:

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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8

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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Анотація:

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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9

Agustina, Lia, I. Made Susanto, and 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 (July 18, 2022): 53–62. http://dx.doi.org/10.20527/sjmekinematika.v7i1.216.

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Анотація:

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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10

Kadir, Muhammad Abdul. "PENGARUH SUDUT KEMIRINGAN DAN LEBAR SUDU TERHADAP KINERJA TURBIN DARRIEUS DENGAN PROFIL SUDU NACA 0021." KURVATEK 4, no. 1 (June 25, 2019): 7–13. http://dx.doi.org/10.33579/krvtk.v4i1.1135.

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Анотація:

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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Більше джерел

Дисертації з теми "Darrieu"

1

Darrieux, de Nux Yolanda. "Entrevista a Yolanda Darrieux de Nux." Pontificia Universidad Católica del Perú, 2012. http://repositorio.pucp.edu.pe/index//handle/123456789/21203.

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2

Hořava, Pavel. "Simulace malé větrné elektrárny se Savoniovým-Darrieovým rotorem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2014. http://www.nusl.cz/ntk/nusl-220933.

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This master‘s thesis deals with the simulation of small wind power plant with Savonius-Darrieus rotor. On the base of the actuator disk theory the performance of modeled power plant is predicted in theoretical part and the power coefficient as well. The process of designing the wind model is also described in this theoretical part. The practical part of this thesis is dedicated to the creating a model of DS300 vertical axis hybrid wind turbine in Matlab/Simulink. This model was used to generating of the power curve of modeled wind power plant and for the computing of power and total produced energy during an average and above-average day as well. The whole thesis is enclosed by evaluating of obtained results.

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3

Sansone, Eugenio. "Modélisation de la cavitation instationnaire dans les turbines darrieus." Grenoble INPG, 2007. http://www.theses.fr/2007INPG0101.

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Le travail représente une contribution à la simulation numérique des écoulements cavitants dans les hydroliennes Darrieus à flux transverse. Il est constitué de cinq chapitres. Le premier présente la place et l'articulation de la thèse dans le projet HARVEST du laboratoire LEGI de Grenoble, ainsi que l'objectif visé dans le cadre des énergies renouvelables. Le deuxième présente les principes de fonctionnement des hydroliennes à flux transverse. Le troisième décrit le panorama général des différents modèles numériques de cavitation. Le quatrième présente une description du code Navier Stokes CAVKA ainsi que tous les développements apportés et introduits afin de le rendre opérationnel pour des géométries en rotation. Enfin, le cinquième chapitre présente une comparaison fine des résultats avec l'expérience. Deux types d'hydrolienne ont été calculées pour plusieurs paramètres d'avance dans le cas de configurations subcavitantes et cavitantes
This work is a contribution to the numerical simulation of the flow around cross-flow Darrieus water turbines. It consists of five chapters. The first chapter deals with the thesis position and role within the HARVEST project of laboratory LEGI at Grenoble, as weil as the purpose to be reached in the framework of renewable energies. Chapter two introduces the basic principles of Darrieus turbines. The third describes the general panorama of various cavitating models. The fourth provides a description of the Navier-Stokes CA VKA code and new numerical developments in order to calculate rotating geometries. Lastly, the fifth chapter highlights an accu rate comparison between numerical and experimental results. Two types of water turbine were calculated under sub- and cavitating flows using different tip speed ratios

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4

Gonzalez, Campos Jose Alberto. "Design and Experimentation of Darrieus Vertical Axis Wind Turbines." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1594690510943748.

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5

Niere, Romain. "Etude d'une station aérogénératrice utilisant un rotor de Darrieus." Bordeaux 1, 1985. http://www.theses.fr/1985BOR10545.

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Анотація:

Dans ce travail, l'auteur presente l'installation et la regulation d'une station aerogeneratrice situee a l'iut a de bordeaux, et utilisant un rotor de darrieus. La regulation de cet aerogenerateur se fait a l'aide d'un microprocesseur qui lance l'eolienne, optimise la puissance captee en jouant sur la charge resistive, et arrete l'appareil en cas de vitesse de rotation trop elevee. Les parametres necessaires a cette regulation ont ete determines experimentalement. Les resistances de charge ont ete optimisees grace a un programme de simulation du fonctionnement du systeme eolien

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6

Nière, Romain. "Etude d'une station aérogénératrice utilisant un rotor de Darrieus." Grenoble : ANRT, 1985. http://catalogue.bnf.fr/ark:/12148/cb37595018b.

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7

Amet, Ervin. "Simulation numérique d'une hydrolienne à axe vertical de type Darrieus." Grenoble INPG, 2009. http://www.theses.fr/2009INPG0047.

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Анотація:

Ce document est une contribution à la modélisation numérique RANS instanonnaire dans des turbines à flux transverse de type Darrieus. Le travail s'est déroulé autour de deux axes. Dans une première étape, une analyse des phénomènes physiques qui influencent le rendement, l'auto-démarrage et l'uniformisation du couple moteur a été faite. Des solutions ont été proposées pour limiter ces inconvénients. L'utilisation de winglets, de congé de raccordement bras / aile ou de pales hélicoïdales a été proposée. Dans une deuxième étape, des modélisations RANS 2D et 3D ont été faites. Le modèle numérique fournit des résultats globaux comparables aux résultats expérimentaux. Il a été montré que les trainées de bout d'aile et d'interférence réduisent chacune d'environ 20% la puissance récupérée. Les pales hélicoïdales ne procurent pas le lissage espéré du couple moteur. Les travaux doivent se poursuivre pour valider de façon certaine cette approche numérique
This document is a contribution to Cne RANS numerical modeling of the unsteady flow field of a lift-driven water turbine of Darrieus type. The study has been conducted around two axes. The first axis was a theoretical analysis of Cne physical phenomena affecting the performance, the self-starting capability and the torque smoothing of these machines. Solutions have been proposed in order to alleviate Cnese disadvantages. The use of fairings, winglets or the helical blades was proposed. The second axis concerns the 3D RANS modeling. The numerical model provides a good agreement with the experimental results. It has been shown that the induced and the interference drag decrease approximately by 20% the power output. The helical blade does not provide the expected smoothing of the rotor torque. The work should be continued in order to validate the numerical results by comparison with experimental velocity field

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8

Gorle, Jagan Mohan Rao. "Development of Circulation Controlled Blade Pitching Laws for Low-Velocity Darrieus Turbine." Thesis, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2015. http://www.theses.fr/2015ESMA0021/document.

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Анотація:

L'étude développée dans cette thèse concerne le contrôle des performances et des lâchers tourbillonnaires au cours du cycle de rotation d'une hydrolienne à axe vertical de type Darrieus. L'élaboration d'une famille de lois de commande d'incidence de pales exploitant le principe de conservation de la circulation autour de profils en mouvement permet ici le contrôle du fonctionnement de l'hydrolienne ainsi que la maîtrise de son sillage tourbillonnaire afin de préserver l'environnement.L'écoulement 2D est simulé à l'aide du solveur incompressible de Star CCM+ afin de mettre en évidence l'effet de ce type de contrôle sur le rendement de la turbine pour différents points de fonctionnement. Ce modèle CFD a été utilisé pour améliorer l'analyse analytique en ce qui concerne l'extraction de l'énergie, la compréhension de l'écoulement autour de l'hydrolienne et le contrôle des tourbillons générés. La nouveauté de cette étude est l'élaboration de lois de commande de pales d'hydrolienne, basées sur des valeurs constantes et transitoires de la circulation, afin d'augmenter la puissance de la turbine tout en garantissant un contrôle efficace de la vorticité et ainsi prévenir de l'interaction entre les tourbillons et les pales. Une bonne comparaison est réalisée entre les résultats analytiques et numériques concernant les forces hydrodynamiques.En outre, une campagne d'essais a été menée afin d'acquérir des mesures quantitatives sur une hydrolienne de type Darrieus à pales fixes en terme de puissance, mais aussi des résultats qualitatifs pertinents comme la visualisation de l'écoulement autour des pales à différentes positions et pour différents points de fonctionnement. La mise en place complète d'un système PTV pour les mesures qualitatives et les étapes de traitement sont discutées et les divers paramètres obtenus à partir des études CFD sont validées en utilisant ces résultats PIV.L'étude expérimentale dans la présente recherche appo11e des informations détaillées sur les gradients de pression et de vitesse, les contours de vorticité et le critère Q qui ont servi à valider les visualisations obtenues numériquement
With key applications in marine renewable energy. the vertical axis water turbine can use current or tidal energy in an eco-friendly manner. However, it is difficult to reconcile optimal performance of hydrokinetic turbines and compliance wilh the aquatic environment as the main drawback of the turbines is the formation of non-linear flow structures caused by the unsteady movement of the blades. Eddies in the flow are advected and can interact with other blades, which leads to a reduction in power output. To limit this phenomenon, the turbines operate at high speeds, which are likely to reduce the shaft power. High speeds of rotational so forbid the passage of aquatic animais, and are the cause of a suction effect on the sediments.The objective of this thesis work is twofold. First, it aims to develop a blade pitch control to get the flow adjusted around the blade profile at any given flow configuration by incorporatin.g the profile's motion with respect to incident flow. Such a system intends to achieve the objective of operating at reduced speeds without vortical releases, which should allow achieving a high torque without causing damage to the environment.This thesis work is mainly carried out in three phases. ln the first phase, the irrotational flow over an arbitrary profile is formulated using conforma] mapping. Prospective potential flow application on the basis of Couchet theory (1976) is involved in the development of a control law that decides the blade pitching in a constant circulation framework. In the second phase, a numerical validation of the developed analytical work is presented using CFD to examine how the theoretical fomulation can be effectively applied to Darricus turbines. In the final phase, two prototypes are developed, one is classical Darrieus turbine with fixed blades, and other is the turbine with pitching blades for experimental measurements of performance as well as flow fields(by PIV) in order to validate the computational results

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9

Du, Longhuan. "Numerical and experimental investigations of Darrieus wind turbine start-up and operation." Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11384/.

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The performance of small, H-Darrieus vertical axis wind turbines has been investigated numerically and experimentally with particular attention paid to turbine performance at low tip speed ratios (low Reynolds number) and to turbine self-starting. Comprehensive wind tunnel measurements have been performed to provide accurate aerofoil data at low Reynolds numbers and high angles of attack; a unique requirement for vertical axis wind turbine (VAWT) starting studies. Two-dimensional CFD models and blade element momentum (BEM) models were created and assessed to provide new insight into turbine performance for different wind conditions and into different turbine geometries in order to guide the design of the experimental investigation. The experimental and numerical studies have demonstrated that design parameters including turbine solidity, blade profile, blade pitch angle and blade surface roughness have strong influences on turbine performance and turbine self-starting capability. Although other authors have conducted numerical studies of the effect of these parameters, this work represents the first experimental validation for turbine performance at low tip speed ratios. In contrast to some previous studies it is shown that there is no advantage to be gained from the use of cambered blades and that symmetrical blades set at small negative incidence provide the best design solution. It is also shown that increasing the turbine’s solidity can significantly improve self-starting capability and that for a given solidity, increasing the rotor radius with a corresponding increase of blade chord improves performance further. However, these starting performance gains are achieved at the expense of a small loss of peak power output. In addition, bio-inspired blades with tubercle leading edges are demonstrated to be able to significantly improve the turbine self-starting capability by introducing a more gradual stall characteristic. These results are the only reported measurements of the effect of tubercle leading edges on vertical axis wind turbines. Finally, a novel, real-time on-board pressure measurement system was developed and employed to examine the instantaneous blade pressure distribution and its variation when the turbine is rotating. The complex flow physics including dynamic stall, laminar separation and flow curvature were successfully recorded and provide unique, unsteady data to increase our knowledge and understanding of the transient aerodynamics of the H-Darrieus wind turbine. The experimental results were also compared with the available CFD and BEM predictions. It is demonstrated that BEM based approaches are highly sensitive to the quality of the aerofoil data that is provided as input to the model. This thesis provides validation of previous work on the question of whether H-Darrieus wind turbines can start without external assistance and in the light of this research a set of revised design rules are proposed to achieve self-starting turbines.

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10

Fabre, Bernard. "Controle d'une eolienne darrieus par un convertisseur mecano-thermique a courants de foucault." Paris 6, 1989. http://www.theses.fr/1989PA066177.

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L'association d'une eolienne a axe vertical (darrieus) a pales droites et d'un convertisseur mecano-thermique a courants de foucault constitue le systeme de chauffage eolien etudie. La definition et la mise au point du convertisseur sont suivies de la description et du controle en vibrations de l'eolienne. La courbe du coefficient de puissance aerodynamique, cp, en fonction du rapport de vitesse specifique, vs, est obtenue par une methode inedite; en milieu naturel, a frequence de rotation variable et sans critere de stabilite, par une correction inertielle et un traitement statistique par classe de vs. La dispersion due aux ecarts de mesure de la vitesse du vent est attenuee grace au traitement suivi du mixage de plusieurs sequences de mesures obtenues sur des plages juxtaposees de vs; l'histogramme des valeurs de vs doit etre large et plat. La position relative stator-rotor du convertisseur constitue le parametre independant dont la commande permet, par son asservissement a la frequence de rotation n, le controle du systeme eolien; a la recherche de l'energie thermique maximale par vent modere et en imposant une limitation de frequence de rotation par vent fort. Le controle uniquement fonction de n n'est optimal que pour un vent stationnaire, controle statique mais nous montrons qu'il permet de recuperer en moyenne 95% de l'energie que donnerait un controle optimal dynamique. La limitation de frequence est obtenue, quelles que soient les conditions de vent, avec le convertisseur de rapport de puissances crete/nominal egal a 1,5. Le fonctionnement autonome est assure par une console de commande a microprocesseur permettant la surveillance du vent, le demarrage, le controle optimal, la limitation de frequence et tous les tests de securite necessaires a la sauvegarde du systeme eolien

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Книги з теми "Darrieu"

1

Danielle Darrieux: 80 ans de carrière. Paris: D. Carpentier, 2011.

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2

Foix, J. V. Darrer comunicat. Barcelona: Quaderns Crema, 1995.

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3

Waterston, Darren. Darren Waterston. New York (420 W. Broadway, New York 10012): Charles Cowles Gallery, 1997.

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4

Hughes, Simon J. S. Darren Mines. Sheffield: Northern Mine Research Society, 1990.

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5

Darren Criss. New York: Gareth Stevens Pub., 2013.

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6

Darrel Morris. Winchester: Telos, 2003.

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7

Darrieus, Henri. Gabriel Darrieus et la guerre sur mer. Vincennes: Service historique de la marine, 1995.

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8

Abadal, Manel Figuera i. El darrer pas. Tremp: Garsineu Edicions, 2000.

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9

Sureda, Bartomeu Mestre i. El darrer manuscrit. Barcelona: Columna, 2010.

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10

Gray, Nigel. Sharon and Darren. London: Young Lions, 1994.

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Частини книг з теми "Darrieu"

1

Brock, Gillian. "Moellendorf, Darrel." In Encyclopedia of Global Justice, 707–9. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-1-4020-9160-5_4.

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2

Mosbahi, Mabrouk, Mariem Lajnef, Mouna Derbel, and Zied Driss. "Performance Study of Helical Darrieus Rotor." In Advances in Mechanical Engineering and Mechanics II, 443–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-86446-0_58.

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3

Batista, N. C., R. Melício, V. M. F. Mendes, J. Figueiredo, and A. H. Reis. "Darrieus Wind Turbine Performance Prediction: Computational Modeling." In IFIP Advances in Information and Communication Technology, 382–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37291-9_41.

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4

Labriola, Carlos V. M., and Jorge Lassig. "Darrieus Turbine for Applications in Urban Environments." In Innovative Renewable Energy, 637–41. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76221-6_70.

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5

Marlin, Demelza, Nicholas Apoifis, and Andrew Bennie. "Darren Allie—Basketball/AFL." In Aboriginal Sports Coaches, Community, and Culture, 53–55. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8481-7_11.

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6

Meziane, Mohamed, Mustapha Faqir, Elhachmi Essadiqi, and Mohamad Fathi Ghanameh. "Numerical Investigation of Hybrid Darrieus-Savonius Wind Turbine Performance." In Advances in Intelligent Systems and Computing, 466–74. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36671-1_41.

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7

Kara Mostefa, M. L., L. Chatellier, and L. Thomas. "Experimental study of Darrieus turbines in confined free-surface flows." In Trends in Renewable Energies Offshore, 143–49. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003360773-17.

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8

Miliket, Temesgen Abriham, Mesfin Belayneh Ageze, and Muluken Temesgen Tigabu. "Numerical Investigations of Variable Pitch Straight-Bladed H-Darrieus VAWT." In Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, 565–83. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-93712-6_38.

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9

Cordner, Gary, and Clifford Shearing. "Darrel Stephens: An American Police Leader with Vision." In Police Leaders as Thinkers, 141–52. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-19700-0_8.

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10

Mabrouki, Ibrahim, Ahmed Samet, Zied Driss, and Mohamed Salah Abid. "Time Step Size Effect on the Hydrodynamic Structure around a Water Darrieus Rotor." In Applied Condition Monitoring, 359–68. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14532-7_37.

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Тези доповідей конференцій з теми "Darrieu"

1

Sutariya, Yashkumar Rameshbhai, and Hong Zhou. "Darrieus Wind Turbines With Twisted Blades." In ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-94124.

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Abstract Darrieus wind turbines are lift-type vertical axis wind turbines. They have merits of simple structure and construction, easy installation and maintenance. Darrieus wind turbines can capture wind from any direction and convert it into electric power. They do not need any yaw mechanism to adjust their orientations in order to make their rotors face wind direction. Because of their lift-type, the power conversion efficiency is relatively high compared with drag-type vertical axis wind turbines like Savonius wind turbines. Although the merits of Darrieus wind turbines are remarkable, they also have their demerits. Compared with other types of vertical axis wind turbines, Darrieus wind turbines have relatively low static torque that weakens their self-starting capability. This research is motivated by surmounting the disadvantages facing Darrieus wind turbines. The research objective is focused on improving Darrieus wind turbines’ static and dynamic performance. In this research, Darrieus wind turbines with different blade shapes and numbers are simulated. The effects of the design parameters on the performance of Darrieus wind turbines are analyzed. Darrieus wind turbines are designed based on their geometric parameters to improve their performance. The results from this research will help the development and promotion of Darrieus wind turbines.

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2

Yanuarsyah, Ilmawan, Vivien Suphandani Djanali, and Bambang Arip Dwiyantoro. "Numerical study on a Darrieus-Savonius wind turbine with Darrieus rotor placement variation." In DISRUPTIVE INNOVATION IN MECHANICAL ENGINEERING FOR INDUSTRY COMPETITIVENESS: Proceedings of the 3rd International Conference on Mechanical Engineering (ICOME 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5046228.

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3

Rehman, Wajiha, Fatima Rehman, and Muhammad Zain Malik. "A Review of Darrieus Water Turbines." In ASME 2018 Power Conference collocated with the ASME 2018 12th International Conference on Energy Sustainability and the ASME 2018 Nuclear Forum. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/power2018-7547.

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Population explosion and rapid industrialization demands increased power production, whereas, environmental concerns are also an issue. The need of time is to develop eco-friendly technology which exploits renewable energy resources. Water is one of the most promising and cheap renewable energy resource. The gross approximate potential of hydro is 128 PW h per year while technically exploitable potential is only 26 PW h per year. Darrieus water turbine (DWT) is like Darrieus wind turbine but it operates in water instead of air. It is an emerging technology for the low head regions. This article focuses on the performance of DWT under different designing parameters i.e. different blade profiles, pitch angle, azimuth angles, tip speed ratio and effect of ducts. It will also focus on the different numerical models used for its simulation. Finally, based on the study an optimum model is selected for practical operations.

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4

Pereira, Tobias, Nelson Batista, Carlos Cardeira, Paulo Oliveira, and Rui Melicio. "Darrieus Wind Turbine Prototype Control Study." In 2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM). IEEE, 2018. http://dx.doi.org/10.1109/speedam.2018.8445380.

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5

Meddane, F., Tayeb Yahiaoui, Omar Imine, and L. Adjlout. "NUMERICAL SIMULATON OF A DARRIEUS TURBINE." In Proceedings of CHT-15. 6th International Symposium on ADVANCES IN COMPUTATIONAL HEAT TRANSFER , May 25-29, 2015, Rutgers University, New Brunswick, NJ, USA. Connecticut: Begellhouse, 2015. http://dx.doi.org/10.1615/ichmt.2015.intsympadvcomputheattransf.1280.

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6

Nakashima, Kazuhiko, Ryosuke Moriyama, Daisuke Matsusita, Satoshi Watanabe, Shin-ichi Tsuda, and Akinori Furukawa. "Effect of Inlet Nozzle Shape on Performance of Darrieus-Type Hydro-Turbine Operated in Small Open Water Channel." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-22491.

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A Darrieus-type hydro-turbine has been developed for the utilization of extra low head hydraulic energy. In the case of a ducted Darrieus-type hydro-turbine which consists of an intake, a runner, a casing and a draft tube, it has been found that the Darrieus runner with the narrow intake can generate larger torque without deterioration of efficiency than that with the parallel intake with the constant width. In this paper, the effect of the shape of the inlet nozzle on the performance of the Darrieus-type hydro-turbine operated in open channel flow is investigated both experimentally and numerically. Tested nozzles are two types of two-dimensional symmetric inlet nozzle, Half Diameter curved nozzle (HD nozzle) and Straight Line nozzle (SL nozzle). As a result, the Darrieus hydroturbine with SL nozzle generates larger power and yields higher efficiency than that with HD nozzle. In addition, the effects of nozzle converging angle and outlet width of SL nozzle on the turbine performance are investigated. As a result, it is found that the Darrieus hydroturbine with SL nozzle having large converging angle generates larger power with higher efficiency than that with the nozzle having small converging angle. And then, it is found that the generated power increases when SL nozzle with large outlet width is installed.

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7

Mertens, Sander, Gijs van Kuik, and Gerard van Bussel. "Performance of a High Tip Speed Ratio H-Darrieus in the Skewed Flow on a Roof." In ASME 2003 Wind Energy Symposium. ASMEDC, 2003. http://dx.doi.org/10.1115/wind2003-523.

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Small wind turbines sited on a flat roof have good opportunities to become widespread. They operate in the accelerated wind above the roof and deliver the power where it is needed. Since the power produced offsets that which would otherwise be bought from the utility, they reduce energy demand and bills from the utility. Furthermore excess power can be sold back to the utility, thus producing income as well. Flow over a building separates at the roof leading edge at a certain angle. Wind turbines sited well above the roof thus operate in skewed flow. H-Darrieus operating at (flat) roofs just recently start to be at public interest, operation of an H-Darrieus in skewed flow is thus not discussed in literature until now. To examine this, a model of an H-Darrieus with high Tip Speed Ratio (λ) in skewed flow is developed. The model is based on multiple stream-tube theory: a combination of axial momentum and blade element theory on an actuator plate representation of the rotor, which is divided into multiple stream-tubes. The model shows that, for an H-Darrieus designed for skewed flow, the optimal power output in skewed flow can be up to two times the power output in normal - perpendicular to the H-Darrieus axis- flow. The spatial dimension of the H-Darrieus is responsible for this.

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8

Saad, Ahmed S., and Mahmoud Ahmed. "Effect of Twist Angle on the Performance of Darrieus Vertical Axis Wind Turbines." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-80198.

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Abstract Conventional straight-bladed Darrieus wind turbines have some drawbacks including large oscillations of coefficient of torque with negative values within a wide range of angle of rotation which decrease the self-starting abilities of the turbine and increase the mechanical vibrations. To solve these weaknesses, the current study proposes twisted-bladed Darrieus turbine instead of the conventional straight-bladed design to flatten the oscillations of torque coefficient in addition to enhancing the self-starting abilities of the Darrieus turbine. The studied angles of twisting are 45, 90, and 135 degrees in addition to the traditional untwisted Darrieus rotor. The trends of coefficient of power against ratio of rotor tip speed in addition to coefficients of dynamic and static torque over a complete cycle (360 degrees) are estimated for all studied twisted-bladed Darrieus turbines. Thus, three dimensional incompressible unsteady Reynolds-Average Navier-Stokes equations in conjunction with the k-ω shear-stress transport turbulence model is developed and numerically simulated utilizing ANSYS Fluent. The developed numerical model is validated using the available measurements from literature. The predicted characteristics of flow field around the proposed twisted-bladed Darrieus turbines are presented and compared with the traditional untwisted design. Accordingly, results revealed a significant improvement of the coefficient of power is attained by increasing the angle of twisting from 0° to 90°. However, with an additional increase in the angle of twisting beyond 90°, the coefficient of power declined. The turbine with an angle of twisting of 90° attains the largest coefficient of power of 0.318 with a percentage increase of 13.2 % in comparison with the traditional straight-bladed Darrieus turbine which has a peak coefficient of power of 0.281. The traditional untwisted turbine has negative values of coefficient of static torque within a large range of angle of rotation. However, the proposed turbines with twisted blades exhibit lower torque fluctuations and positive static torque values at all angles of rotation resulting in enhancing the self-starting abilities of the Darrieus turbine.

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9

Worasinchai, Supakit, Grant L. Ingram, and Robert G. Dominy. "The Physics of H-Darrieus Turbine Starting Behaviour." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25461.

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This paper investigates Darrieus turbine starting behaviour and provides a resolution to the contradictory accounts of whether or not the Darrieus turbine can self-start. The paper builds on previous work proposing an analogy between the aerofoil in Darrieus motion and flapping-wing flow mechanisms. This analogy suggests that unsteadiness could be exploited to generate additional thrust and that this unsteady thrust generation is governed by rotor geometry. To confirm the hypothesis, this investigation incorporated unsteady effects into a rotor analysis which resolved the differences between experiments and predictions made using a steady-state assumption. The fundamental physics of starting were also studied and the rotor geometry parameters that govern the generation of unsteady thrust were explored: namely chord-to-diameter ratio and blade aspect ratio. Further simulation showed that the Darrieus rotor is prone to be locked in a deadband where the thrust is not continuous around a blade rotation. This discrete thrust is caused by the large variation of incidence angle during start-up making the Darrieus blade ineffective during part of the rotation. The results also show that unsteady thrust can be promoted through an appropriate selection of blade aspect ratio and chord-to-diameter ratio and therefore it is possible to design rotors that have an ability to self-start. A new definition of self-starting is proposed based upon this improved understanding.

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Niculescu, M. L., M. G. Cojocaru, M. V. Pricop, D. Pepelea, A. Dumitrache, and D. E. Crunteanu. "CFD analysis of a Darrieus wind turbine." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4992591.

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Звіти організацій з теми "Darrieu"

1

Bleuel, D. L. FY2018 Annual report on Darren Bleuel's research activities for neutron imaging facility development. Office of Scientific and Technical Information (OSTI), November 2018. http://dx.doi.org/10.2172/1557396.

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2

Bleuel, D. L. FY2017 Annual report on Darren Bleuel's research activities for neutron imaging facility development. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1562801.

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3

Scharffscher, Kristin Sørung. Fighting pandemics with enhanced risk communication: Messages, compliance and vulnerability during the COVID-19 outbreak (PAN-FIGHT): Summarised findings and recommendations. University of Stavanger, November 2022. http://dx.doi.org/10.31265/usps.256.

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This report is a product of the research collaboration project Fighting pandemics with enhanced risk communication: Messages, compliance and vulnerability during the COVID-19 outbreak (PAN-FIGHT). Project initiator and coordinator is The University of Stavanger, and main project partner institutions are the University of Geneva, Mid-Sweden University, King’s College London and DIALOGIK Germany. PAN-FIGHT is funded by the Research Council of Norway and has run from August 2020 to September 2022. Summarised findings and recommendations has been written and edited by Kristin S. Scharffscher with contributions from Ole Andreas Engen, Claudia Morsut, Mathilde Bourrier, Emma Comrie, Farnaz Mahdavian, Michael Deml, Evangelia Petridou, Jörgen Sparf, Frederic E. Bouder, Matan Shapiro, Darrick Evensen, George Warren, Sanjana Arora, Hilda Mjøll Gunnarsdottir, Susanna Öhman, Siri Wiig and Olena Koval.

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