Relevant bibliographies by topics / Wind turbine

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Wind turbine'

Author: Grafiati
Published: 4 June 2021
Last updated: 21 December 2024

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Journal articles on the topic "Wind turbine"

1

Khudri Johari, Muhd, Muhammad Azim A Jalil, and Mohammad Faizal Mohd Shariff. "Comparison of horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT)." International Journal of Engineering & Technology 7, no. 4.13 (October 9, 2018): 74. http://dx.doi.org/10.14419/ijet.v7i4.13.21333.

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As the demand for green technology is rising rapidly worldwide, it is important that Malaysian researchers take advantage of Malaysia’s windy climates and areas to initiate more power generation projects using wind. The main objectives of this study are to build a functional wind turbine and to compare the performance of two types of design for wind turbine under different speeds and behaviours of the wind. A three-blade horizontal axis wind turbine (HAWT) and a Darrieus-type vertical axis wind turbine (VAWT) have been designed with CATIA software and constructed using a 3D-printing method. Both wind turbines have undergone series of tests before the voltage and current output from the wind turbines are collected. The result of the test is used to compare the performance of both wind turbines that will imply which design has the best efficiency and performance for Malaysia’s tropical climate. While HAWT can generate higher voltage (up to 8.99 V at one point), it decreases back to 0 V when the wind angle changes. VAWT, however, can generate lower voltage (1.4 V) but changes in the wind angle does not affect its voltage output at all. The analysis has proven that VAWT is significantly more efficient to be built and utilized for Malaysia’s tropical and windy climates. This is also an initiative project to gauge the possibility of building wind turbines, which could be built on the extensive and windy areas surrounding Malaysian airports.
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Prasetyo, Alfian Abdi, Fikri Aufa Rafinda, and Herminarto Nugroho. "Perbandingan Metode Optimasi Non-Linear Partical Swarm Optimization (PSO) Dengan Metode Interior Point Untuk Optimasi Daya Pada Turbin Angin Dengan Menentukan Nilai Optimum Pitch Angle." KILAT 11, no. 1 (April 10, 2022): 103–10. http://dx.doi.org/10.33322/kilat.v11i1.1324.

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Along with the increasing development of technology, demand for electricity is also increasing. To overcome the problem of reducing electricity raw materials originating from fossil energy, new renewable energi is the solution. One of the new renewable energi sources that have high efficiency values is wind. Wind power plants require wind speed to produce efficiency and output power in the wind turbine. The optimization problem of a wind turbine is to determine the angle of placement of the wind turbine in order to produce the desired optimum power. This journal is determining the wind turbine pitch angle to determine the optimum power by comparing two optimization methods, namely Partical Swarm Optimization (PSO) and the Interior Point optimization method. The data to be obtained is the optimal distance between the turbines and the comparison of the efficiency between the two optimization methods in producing the optimal solution for the problem of placing wind turbines in the wind turbine field. Seiring dengan meningkatnya perkembangan teknologi, kebutuhan listrik juga semakin meningkat. Untuk mengatasi permasalahan berkurangnya bahan baku listrik yang berasal dari energi fosil, maka energi baru terbarukan adalah solusinya. Sumber energi baru terbarukan yang memiliki nilai efisiensi yang tinggi salah satunya adalah angin. Pembangkit listrik tenaga angin membutuhkan kecepatan angin untuk menghasilkan efisiensi dan daya keluaran pada turbin angin tersebut. Permasalahan optimisasi dari suatu turbin angin adalah menentukan sudut peletakan turbin angin agar menghasilkan daya optimum yang diinginkan. Pada jurnal ini bertujuan menentukan pitch angle wind turbine unutk menentukan daya optimum dengan membandingkan dua metode optimasi yaitu Partical Swarm Optimization (PSO) dan metode optimasi Interior Point. Data yang akan diperoleh adalah jarak optimal antar turbin dan perbandingan efisiensi antara kedua metode optimasi tersebut dalam menghasilkan solusi optimal untuk masalah penempatan turbin angin di lapangan turbin angin.
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Kurniawati, Diniar Mungil. "Investigasi Performa Turbin Angin Crossflow Dengan Simulasi Numerik 2D." JTT (Jurnal Teknologi Terpadu) 8, no. 1 (April 27, 2020): 7–12. http://dx.doi.org/10.32487/jtt.v8i1.762.

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Wind turbine is a solution to harness of renewable energy because it requires wind as the main energy. Wind turbine work by extracting wind energy into electrical energy. Crossflow wind turbine is one of the wind turbines that are developed because it does not need wind direction to produce maximum efficiency. Crossflow wind turbines work with the concept of multiple interactions, namely in the first interaction the wind hits the first level of turbine blades, then the interaction of the two winds, the remainder of the first interaction enters the second level blades before leaving the wind turbine. In the design of crossflow wind turbine the diameter ratio and slope angle are important factors that influence to determine of performance in crossflow wind turbine. In this study varied the angle of slope 90 ° and variations in diameter ratio of 0.6 and 0.7. The study aimed to analyze the effect of diameter ratio and slope angle in performance of the crossflow wind turbine. This research was conducted with numerical simulation through 2D CFD modeling. The results showed that the best performance of crossflow wind turbine occurred at diameter ratio variation 0.7 in TSR 0.3 with the best CP value 0.34.
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Doerffer, Piotr, Krzysztof Doerffer, Tomasz Ochrymiuk, and Janusz Telega. "Variable Size Twin-Rotor Wind Turbine." Energies 12, no. 13 (July 2, 2019): 2543. http://dx.doi.org/10.3390/en12132543.

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The paper presents a new concept of a vertical axis wind turbine. The idea is focused on small wind turbines, and therefore, the dominating quality is safety. Another important necessary feature is efficient operation at small winds. This implies an application of the drag driven solution such as the Savonius rotor. The presented concept is aimed at reducing the rotor size and the cost of implementation. A new wind turbine solution, its efficiency, and functionality are described. The results of numerical simulations being a proof of the concept are reported. The simulations were followed by wind tunnel tests. Finally several prototypes were built and investigated for a longer period of time. The new wind turbine concept has undergone various testing and implementation efforts, making this idea matured, well proven and documented. A new feature, namely, the wind turbine size reduction at strong winds, or in other words, an increase in the wind turbine size at low winds is the reason why it is difficult to compare this turbine with other turbines on the market. The power output depends not only on the turbine efficiency but also on its varying size.
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Yohana, Eflita, MSK Tony Suryo U, Binawan Luhung, Mohamad Julian Reza, and M. Badruz Zaman. "Experimental Study of Wind Booster Addition for Savonius Vertical Wind Turbine of Two Blades Variations Using Low Wind Speed." E3S Web of Conferences 125 (2019): 14003. http://dx.doi.org/10.1051/e3sconf/201912514003.

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The Wind turbine is a tool used in Wind Energy Conversion System (WECS). The wind turbine produces electricity by converting wind energy into kinetic energy and spinning to produce electricity. Vertical Axis Wind Turbine (VAWT) is designed to produce electricity from winds at low speeds. Vertical wind turbines have 2 types, they are wind turbine Savonius and Darrieus. This research is to know the effect of addition wind booster to Savonius vertical wind turbine with the variation 2 blades and 3 blades. Calculation the power generated by wind turbine using energy analysis method using the concept of the first law of thermodynamics. The result obtained is the highest value of blade power in Savonius wind turbine without wind booster (16.5 ± 1.9) W at wind speed 7 m/s with a tip speed ratio of 1.00 ± 0.01. While wind turbine Savonius with wind booster has the highest power (26.3 ± 1.6) W when the wind speed of 7 m/s with a tip speed ratio of 1.26 ± 0.01. The average value of vertical wind turbine power increases Savonius after wind booster use of 56%.
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Rudianto, Daniel. "RANCANG BANGUN TURBIN ANGIN SAVONIUS 200 WATT." Conference SENATIK STT Adisutjipto Yogyakarta 2 (November 15, 2016): 71. http://dx.doi.org/10.28989/senatik.v2i0.35.

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This study aimed to establish the type of Savonius wind turbines that capable of generating electric power of 200 Watts. This objective relates to Bantul District Government program which plans to build wind turbin generating electrical power (Pembangkit Listrik Tenaga Bayu, PLTB) 200 Watt as a backup power source for powering cooling fish caught by fishermen in the southern coast. Savonius Turbine chosen with consideration that it has simple construction so that the cost is not expensive, not depending on the direction of the wind, and is suitable for small power plants.Design of Savonius turbine blade has been completed, the turbine blade height 168 cm and a diameter of 55 cm. Blade turbine mounted on an arm along 55 cm from the turbine shaft and separate 120º. The turbine is supported by a 3-foot-tall turbines framework 2,5 m iron box 4 cm x 4 cm. The test simulated to determine the turbine rotation has been performed at varying wind speeds, i.e. 2 m /s, 4 m /s and 6 m /s.Based on test results, the turbine is capable of rotating an average of 54,2 rpm at a wind speed of 2 m /s; 86,8 rpm at a wind speed of 4 m /s; and 124,2 rpm at a wind speed of 6 m /s. These test results indicate that the Savonius turbines can be used to drive a generator producing the need of electrical energy
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Hosseini Bafoghi, Seyed Mojtaba, and Hamidreza Khezri. "Simulating the Speed control System of Wind Turbines Using MATLAB Software." Mapta Journal of Mechanical and Industrial Engineering (MJMIE) 4, no. 2 (December 23, 2020): 1–6. http://dx.doi.org/10.33544/mjmie.v4i2.133.

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In this paper, a mathematical method is proposed to control the output frequency of a self-excited induction generator using wind turbines and static loads. A dynamic model of the wind turbine is implemented to model the Connections and fittings of the wind turbine to convert the wing energy to electrical energy. Also a PID controller system is proposed to control the rotor speed of the wind turbine. The proposed mathematical model is developed in MATLAB-Simulink software. The simulation results showed that the developed controller can be used to control the wind turbine velocity.
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Tian, Wenxin, Hao Tie, Shitang Ke, Jiawei Wan, Xiuyong Zhao, Yuze Zhao, Lidong Zhang, and Sheng Wang. "Numerical Investigation of the Influence of the Wake of Wind Turbines with Different Scales Based on OpenFOAM." Applied Sciences 12, no. 19 (September 25, 2022): 9624. http://dx.doi.org/10.3390/app12199624.

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The wake of a wind turbine has an important influence on the output power of wind farms. Staggered height layout is an emerging method for the layout optimization of wind farms. In order to study the effect of a staggered height layout on the overall power output of wind farms in depth, we established a combination of two large wind turbines and three small wind turbines arranged laterally between the two large wind turbines, and set four working conditions with different distances between the small wind turbines and the downstream large wind turbines as the research objects. The wind turbine array is analyzed by numerical simulation The layouts add three small wind turbines between the two large wind turbines, and each row of small wind turbines has a different distance from the downstream large wind turbines. The results show that as the distance from the upstream large wind turbine increases, the power of the three small wind turbines on the downstream wind turbine tends to be positive. The numerical simulation suggests that under the inflow wind speed, the closer to the downstream large wind turbine, the higher the wind speed is at the hub height.
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Lillahulhaq, Z., A. Muchyiddin, R. W. Suhadak, I. Amirullah, F. D. Sandy, and A. C. Embot. "Experimental Study Wind Turbine Performance of Straight-Savonius and Ice-Wind Type on the Similar proportion Aspect Ratio." Journal of Physics: Conference Series 2117, no. 1 (November 1, 2021): 012008. http://dx.doi.org/10.1088/1742-6596/2117/1/012008.

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Abstract The Performance of wind turbines at low speed can be improved by Ice-Wind model, particularly in self-starting conditions. Compared to a traditional wind turbine with two blades of the similar area and material, Ice-Wind can increase efficiency by 19%. Research on the Savonius turbine, particularly the Ice-Wind turbine, is challenging. It is because it has many restrictive parameters, such as the height, diameter, and area of the turbine blades. The Ice-Wind turbine shape is obtained by cutting a Savonius turbine. This process led to research on Ice-Wind turbines only under the similar parameters. The aspect ratio of a Savonius turbine has a significant effect on the speed, mechanical power and static-torque produced by the wind turbine. The research was done on Savonius and Ice-Wind turbines with the similar aspect ratio. The results show that the speed, power factor and efficiency of the Savonius turbine are higher than those of Ice-Wind. However, Savonius produces a smaller static-torque coefficient value than Ice-Wind. The results of this research contrast with other studies comparing Savonius and Ice-Wind turbines. In other researches, Savonius and Ice-Wind turbines have the similar area but different aspect ratios.
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P.P., Dr Ritapure. "Design And Analysis of Modern Vertical Axis Wind Turbine (VAWT)." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 04 (April 21, 2024): 1–5. http://dx.doi.org/10.55041/ijsrem31233.

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With traditional energy sources running low, the world is turning more towards renewable energy, particularly wind power. But current wind turbines have their flaws. Enter the wind turbine tree, a potential solution to these issues. This study looks at various research papers on different wind turbine designs. After analysing them all, it's clear that wind turbine trees with Savonius blades are better than traditional bladed turbines. They take up less space and produce the same amount of power. This paper explores these findings and suggests that wind turbine trees could be the future of wind energy.. Keywords- Renewable Energy, Wind Turbine, wind Turbine Tree, Vertical axis wind turbine (VAWT), Horizontal axis wind turbine (HAWT), Computational fluid Dynamics (CFD).
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Dissertations / Theses on the topic "Wind turbine"

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Mitchell, Andrew J. "Wind Turbine Noise." Thesis, University of Canterbury. Mechanical Engineering, 2004. http://hdl.handle.net/10092/6622.

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The objectives of this thesis were (i) to investigate the main sources and paths of noise on modern utility size wind turbines; (ii) to explore methods of reducing the noise; (iii) to assess our current ability to accurately predict and measure wind turbine noise. The accomplishment of these objectives would enable quieter wind turbines to be developed and allow them to be located near residential dwellings with greater confidence that the noise would not be a nuisance. A comprehensive review of the current literature was carried out and the findings were used as a basis for the investigative work conducted. It was found that wind turbine noise could be classed as either aerodynamically produced noise or mechanically produced noise. Aerodynamically produced noise on wind turbines arises mainly from the interaction of the flow over the blade with the surrounding air. Mechanically produced noise arises from a number of sources such as the gearbox, generator and hydraulic pumps. The noise can be radiated directly from the noisy component (airborne) and / or transferred through the structure of the turbine and radiated elsewhere (structure-borne) such as the tower. The prototype Windflow 500 wind turbine near to Christchurch was used for the majority of the investigative work carried out, and to assess the predictions made. The main radiators of noise from the turbine were identified as the blades (86 – 90% of the total sound power), the tower (initially 8 – 12% but later reduced to ~4% of the total sound power), and the nacelle cladding (1% of the total sound power). A prominent tone in the sound power spectrum from the turbine was observed in the 315 Hz 1/3 octave band. This was shown to be predominantly caused by gear meshing in the second stage of the gearbox at 311 Hz. The presence of the tone was significant because under commonly used standards a tonal penalty would be applied to the measured sound pressure level from the turbine to account for the extra annoyance caused by the tone. This in turn would mean that any potential wind farms would need to be sited further from residential dwellings than would otherwise be necessary in order to comply with noise regulations. Investigations were carried out that addressed the noise radiated from each of the main contributors outlined above. The sound power level radiated from the tower was found to be effectively reduced by attaching rubber tiles at strategic locations inside the tower. Noise radiated from the nacelle was reduced with a combination of acoustic insulation and acoustic absorption inside the nacelle. An investigation into the gearbox noise was also carried out. Attempts to reduce the tonal noise caused by gear meshing were made with little success but the investigation provided a good basis upon which to conduct further work. Preliminary investigations into both structure-borne and aerodynamically generated blade noise were carried out. The structure-borne blade noise investigation showed that the blades readily vibrated at a range of frequencies, the result being that structurally transmitted noise radiated from the blades was likely to be present at high levels. Research showed that the structure-borne noise radiated from the blades could be significantly reduced by partially filling the internal cavity of the blades with foam. The investigation of aerodynamically produced noise was carried out on a section of Windflow 500 blade in the low noise wind tunnel at the University of Canterbury. The tests showed that the blade generated noise at a range of frequencies including those in the 315 Hz 1/3 octave band. This suggested that the tonal noise measured from the blades was not only due to structurally transmitted noise from the gearbox but was also contributed to by aerodynamically produced noise. It was found that the noise from the blade section could be reduced by up to 4.5 dB at certain frequencies by attaching serrated strips to the trailing edge of the aerofoil. Empirical equations for prediction of wind turbine sound power levels were evaluated and found to be in good agreement with measured data. It was found that accurate spectral predictions of the sound power level were much more difficult. However given spectral data for a turbine, it was found that accurate predictions of the noise propagation from the turbine could be made, taking into account meteorological effects and the effect of complex topography. It was found that the CONCAWE propagation model was well suited to the prediction of noise propagation from wind turbines because of its superior handling of meteorological effects. In an investigation carried out which modelled the Gebbies Pass site of the Windflow 500 it was found that the CONCAWE model could predict sound pressure levels from the turbine to within 2 dB at distances of up to 1400 m. Further work in the area of wind turbine noise should be focused on the reduction of blade noise. This is especially relevant to the Windflow 500 since blade noise was found to be by far the largest contributor to total noise radiated from the turbine. Acoustic treatments elsewhere would therefore produce only small reductions in the total sound power emitted by the turbine.
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Lynum, Susanne. "Wind turbine wake meandering." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22400.

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In this master thesis the meandering of the wake of a three bladed horizontal axis model wind turbine has been studied. Measurements have been conducted by the use of four hot-wire probes located at multiple nearby points in the wake at X/D = 1, 3 and 5 downstream the model wind turbine. The meandering has been studied based on the location of the tip vortices shed by the turbine blades. The experiments were conducted in the wind tunnel at NTNU at the Department of Energy and Process Engineering. The aim of the study was to see the effect on the meandering of the wake of the model turbine when placed in an incoming flow with turbulence intensity typical for atmospheric turbulence, compared to an incoming flow with a low turbulence intensity round 0.3 %. The atmospheric turbulence was generated by inserting a grid in the inlet to the test section in the wind tunnel. The grid generated a turbulence intensity round 5.5 % and integral length scales of Luuz = 3.1E-2 m and Luux = 6.5E-2 m at the position of the model wind turbine in the tunnel. The performance of the model turbine in both incoming flows was calculated based on measurements of the thrust and torque acting on the turbine in a free stream velocity of 10 m/s. The greatest deviation in the performance curve was found at the top of the curve; however the difference between the two cases was minor. Initial measurements with a single hot-wire probe was conducted in the wake of the turbine to locate the tip vortices. Based on these results, the location to conduct the multiple hot-wire measurements was decided. Already at this stage the effect of the grid turbulence was evident due to the smeared out energy in the flow in the wake caused by diffusion and mixing. The tip speed ratio (TSR) of the model wind turbine was 6 in the case without grid generated turbulence, and 7 in the case with grid turbulence during the final measurements in the wake. The effect of the change in TSR was evaluated, and it was found that new measurements were not needed. The normal stress based on the velocity measurements in the wake were phase averaged according to the position of the turbine blade using Matlab. When comparing these results with the normal stress calculated directly from the time series, it was found that the tip vortices had merged together or broken up at all measurement point except at X/D = 1 downstream the turbine without grid generated turbulence. Using power spectral density function (PSD) the observations were confirmed.The tip vortices was not equally distributed within the wake and were located 30°, 128° and 224° at respectively z/R =1.12, 1.15 and 1.20. Their diameters were found to be 1.8E-2 m, 1.35E-2 m, 2.7E-2 m in z direction. The location of the peak in the normal stress tended to meander a bit back and forth, mainly directed towards the rotor center, with a distance from 4.5E-3 m to 1.8E-2 m, and in the streamwise direction with a total distance of 6.17E-2 m. The tip vortices seem to meander individually within the wake, and not with the same distance.Based on the results and observations conducted throughout this study, new measurements should be conducted at a shorter distance to the turbine rotor to be able to compare the meandering of the wake for the two different incoming flows.
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Chinchore, Asmita C. "Computational Study of Savonius Wind Turbine." Cleveland State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=csu1389795972.

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Chaath, Alaaeddin. "Improving the Design of Wind Turbine Plants : Future Design of Wind Turbine Plants." Thesis, Högskolan i Halmstad, Energivetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31084.

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Applying the new ideas developed by the present study on the current design of WTP can lead to satisfactory results and give flexibility in terms of producing more electrical power during periods of low/medium wind velocity. The innovative ideas and methods included in the present work reveal the features of the future renewable energy designs that could, in the few coming years, revolutionize the field of wind turbine designs worldwide. Also, increase the capacity factor significantly, since the application of these ideas in areas where wind class II and III blows have proven to be very effective. Especially, when compares the result of new ideas with the current wind turbine designs. Testing the innovative ideas regarding the future wind turbines on a current WTP achieved a good results in increasing electric energy production over the year. For example applies the new ideas on a WTP model Enercon (E-101) will achieve an annual increase around 20% of electric power generation (wind class II, Cp = 36), i.e. when wind speed is ranging from 0-10 m/s (Level C – option 02) the production improved at the highest value, reaching up to +46%. Also, in Level B the generation of electricity witnessed an increase up to 10% when the wind velocity being always between level C with a minimum of 10 meters per second and Level A (Level A is the maximum output value, which is changing from one turbine type to the other).
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Gwon, Tae gyun. "Structural Analyses of Wind Turbine Tower for 3 kW Horizontal Axis Wind Turbine." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/600.

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Structure analyses of a steel tower for Cal Poly's 3 kW small wind turbine is presented. First, some general design aspects of the wind turbine tower are discussed: types, heights, and some other factors that can be considered for the design of wind turbine tower. Then, Cal Poly's wind turbine tower design is presented, highlighting its main design features. Secondly, structure analysis for Cal Poly's wind turbine tower is discussed and presented. The loads that are specific to the wind turbine system and the tower are explained. The loads for the static analysis of the tower were calculated as well. The majority of the structure analysis of the tower was performed using the finite element method (FEM). Using Abaqus, commercial FEM software, both static and dynamic structural analyses were performed. A simplified finite element model that represents the wind turbine tower was created using beam, shell, and inertia elements. An ultimate load condition was applied to check the stress level of the tower in the static analysis. For the dynamic analysis, the frequency extraction was performed in order to obtain the natural frequencies and the mode shapes of the tower. Using the results, the response spectrum analysis and the transient dynamic analysis, which are based on the modal superposition method, were performed in order to see the structure's response for earthquakes that are likely to happen at the wind turbine installation site.
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Farr, Thomas D. "The effects of atmospheric and wake turbulence on wind turbines and wind turbine wakes." Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/807177/.

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Wind tunnel studies using model wind turbines have been used to investigate the effects and characteristics of neutral and unstable atmospheric boundary layers on their operation and wake behaviour. Wind turbine arrays have also been arranged to observe the effect of wake interaction. Single-point two-component and two-point single-component velocity measurements have been made using laser Doppler anemometry in conjunction with cold-wire anemometry to interrogate the modelled boundary layer. The manufacture and installation of a second traverse mechanism in the wind tunnel was necessary to perform the two-point measurements, along with the development of laboratory software for control and data analysis. In order to allow for measurements of turbine performance, a current sensor was developed so that correlations could be made between velocity and torque fluctuations. Investigation of larger arrays, up to 12 turbines, required the production of additional turbines and installation and subsequent integration of the associated control systems. Measurements made in the neutral flow conditions show that there is an increasing correlation between the upstream turbulence and torque fluctuations with proximity to the turbine, especially in the wake of another turbine where the flow is rapidly evolving. Two-point velocity measurements, with a lateral separation, have shown that there is little effect of the turbine on the correlation of the flow over the rotor disc. Analysis of data from this type of measurement also shows that in an array of four aligned turbines, the spatial structures reach an equilibrium state and are of larger size after the second turbine. Furthermore, the velocity-torque correlation magnitude decreases after the first turbine, but then increases with distance through the array owing to the increased correlation over the rotor disc, although not to the level observed for the first turbine. The turbulence approaching the first turbine behaves in a frozen-flow manner, but this is not true for the second and subsequent turbines, although the idea of convection time still applies. Measurements made in the modelled unstable atmospheric boundary layer show that the length and time scales are changed in the flow, in addition to the alteration of the profiles of mean velocity and Reynolds stresses. The increased turbulence caused by the convective boundary layer increases the rate of wake deficit recovery and does not result in the same spatial structures as the neutral conditions. Temperature effects are of secondary importance with regard to wake and turbine behaviour, with the main driving force behind the performance being the increased turbulence levels.
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Pearson, Charlie. "Vertical axis wind turbine acoustics." Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/245256.

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Increasing awareness of the issues of climate change and sustainable energy use has led to growing levels of interest in small-scale, decentralised power generation. Small-scale wind power has seen significant growth in the last ten years, partly due to the political support for renewable energy and the introduction of Feed In Tariffs, which pay home owners for generating their own electricity. Due to their ability to respond quickly to changing wind conditions, small-scale vertical axis wind turbines (VAWTs) have been proposed as an efficient solution for deployment in built up areas, where the wind is more gusty in nature. If VAWTs are erected in built up areas they will be inherently close to people; consequently, public acceptance of the turbines is essential. One common obstacle to the installation of wind turbines is noise annoyance, so it is important to make the VAWT rotors as quiet as possible. To date, very little work has been undertaken to investigate the sources of noise on VAWTs. The primary aim of this study was therefore to gather experimental data of the noise from various VAWT rotor configurations, for a range of operating conditions. Experimental measurements were carried out using the phased acoustic array in the closed section Markham wind tunnel at Cambridge University Engineering Department. Beamforming was used in conjunction with analysis of the measured sound spectra in order to locate and identify the noise sources on the VAWT rotors. Initial comparisons of the spectra from the model rotor and a full-scale rotor showed good qualitative agreement, suggesting that the conclusions from the experiments would be transferable to real VAWT rotors. One clear feature observed in both sets of spectra was a broadband peak around 1-2kHz, which spectral scaling methods demonstrated was due to laminar boundary layer tonal noise. Application of boundary layer trips to the inner surfaces of the blades on the model rotor was found to eliminate this noise source, and reduced the amplitude of the spectra by up to 10dB in the region of the broadband peak. This method could easily be applied to a full-scale rotor and should result in measurable noise reductions. At low tip speed ratios (TSR) the blades on a VAWT experience dynamic stall and it was found that this led to significant noise radiation from the upstream half of the rotor. As the TSR was increased the dominant source was seen to move to the downstream half of the rotor; this noise was thought to be due to the interaction of the blades in the downstream half of the rotor with the wake from the blades in the upstream half. It was suggested that blade wake interaction is the dominant noise source in the typical range of peak performance for the full-scale QR5 rotor. Different solidity rotors were investigated by using 2-, 3- and 4-bladed rotors and it was found that increasing the solidity had a similar effect to increasing the TSR. This is due to the fact that the induction factor, which governs the deflection of the flow through the rotor, is a function of both the rotor solidity and the TSR. With a large body of experimental data for validation, it was possible to investigate computational noise prediction methods. A harmonic model was developed that aimed to predict the sound radiated by periodic fluctuations in the blade loads. This model was shown to agree with similar models derived by other authors, but to make accurate predictions very high resolution input data was required. Since such high resolution blade loading data is unlikely to be available, and due to the dominance of stochastic sources, the harmonic model was not an especially useful predictive tool. However, it was used to investigate the importance of the near-field components of the sound radiated by the wind tunnel model to the acoustic array. It was shown that the near-field terms were significant over a wide range of frequencies, and the total spectrum was always greater than that of the far-field component. This implied that the noise levels measured by the acoustic array represented an upper bound on the sound radiated to the far-field, and hence that the latter would also be dominated by stochastic components. An alternative application of the harmonic model, which attempted to determine the blade loading harmonics from the harmonics in the sound field was proposed. This inversion method utilised a novel convex optimisation technique that was found to generate good solutions in the simulated test cases, even in the presence of significant random noise. The method was found to be insensitive at low frequencies, which made it ineffective for inverting the real microphone data, although this was shown to be at least partly due to the limitations imposed by the array size. In addition to the harmonic models, an empirical noise prediction method using the spectral scaling laws derived by \citet*{Brooks_1989} was trialled, and was found to be capable of making predictions that were in agreement with the measured data. The model was shown to be sensitive to the exact choice of turbulence parameters used and was also found to require good quality aerodynamic data to make accurate noise predictions. If such data were available however, it is expected that this empirical model would be able to make useful predictions of the noise radiated by a VAWT rotor.
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Worasinchai, Supakit. "Small wind turbine starting behaviour." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/4436/.

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Small wind turbines that operate in low-wind environments are prone to suffer performance degradation as they often fail to accelerate to a steady, power-producing condition. The behaviour during this process is called “starting behaviour” and it is the subject of this present work. This thesis evaluates potential benefits that can be obtained from the improvement of starting behaviour, investigates, in particular, small wind turbine starting behaviour (both horizontal- and vertical-axis), and presents aerofoil performance characteristics (both steady and unsteady) needed for the analysis. All of the investigations were conducted using a new set of aerodynamic performance data of six aerofoils (NACA0012, SG6043, SD7062, DU06-W-200, S1223, and S1223B). All of the data were obtained at flow conditions that small wind turbine blades have to operate with during the startup - low Reynolds number (from 65000 to 150000), high angle of attack (through 360◦), and high reduced frequency (from 0.05 to 0.20). In order to obtain accurate aerodynamic data at high incidences, a series of CFD simulations were undertaken to illustrate effects of wall proximity and to determine test section sizes that offer minimum proximity effects. A study was carried out on the entire horizontal-axis wind turbine generation system to understand its starting characteristics and to estimate potential benefits of improved starting. Comparisons of three different blade configurations reveal that the use of mixed-aerofoil blades leads to a significant increase in starting capability. The improved starting capability effectively reduces the time that the turbine takes to reach its power-extraction period and, hence, an increase in overall energy yield. The increase can be as high as 40%. Investigations into H-Darriues turbine self-starting capability were made through the analogy between the aerofoil in Darrieus motion and flapping-wing flow mechanisms. The investigations reveal that the unsteadiness associated with the rotor is key to predicting its starting behaviour and the accurate prediction can be made when this transient aerofoil behaviour is correctly modelled. The investigations based upon the analogy also indicate that the unsteadiness can be exploited to promote the turbine ability to self-start. Aerodynamically, this exploitation is related to the rotor geometry itself.
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Loland, Kari Medby. "Wind Turbine in Yawed Operation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13437.

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The task of this project was to investigate the near wake, performance characteristics and yaw moment on a model wind turbine. The test turbine is a horizontal axis three bladed machine with a rotor diameter of 0.9 meter. Initially it is an upwind turbine, but was used for downwind measurements as well by rotating the blades and the entire construction 180^0. For the wake measurements the tip speed ratio was set to be TSR=3, TSR=6 and TSR=9 to describe the different regimes; partly stalled, optimal operation and partly propeller operation. Two different yaw angles, 0^0 and 30^0, was also explored for the near wake measurements. The velocity field was measured at X/D=1, as well as X/D=4 for TSR=6 and the two yaw angles; X/D being the number of rotor diameters downstream from the rotor plane. The performance characteristics and yaw moment were measured for yaw angles 0^0, 10^0, 20^0 and 30^0, and with tip speed ratios from 1 to 11. The power and thrust coefficients were found to decrease with increasing yaw angle. This is due to the reduced projected rotor area and reduced effective wind velocity component interacting with the turbine blades. The loss in power due to the yaw angle of the turbine is approximately 6% for yawAngle=10^0 and 40% for yawAngle=30^0 with upstream configuration. For downstream setup the reduction in power due to the yaw angle was 5.2% and 38% for yawAngle=10^0 and yawAngle=30^0 respectively. The near wake velocity field was strongly influenced by tip speed ratio and yaw angle. At TSR=3 the outer parts of the wake had a velocity close to the freestream velocity. Therefore much of the flow passes through without interacting with the rotor blades. For TSR=6 the velocity deficit was close to uniform in the wake. Most of the turbine blades operate efficiently at the design condition, and gives the peak in the power coefficient curve at this TSR. When TSR=9 the inner part of the blades experience negative angle of attack and provide energy to the wind instead of subtracting it. The outer parts of the blade operate more efficiently, but due to the inner part working as a propeller the power coefficient is low. The thrust coefficient is high for this operating condition. When the turbine is operating in yawed condition, the wake width is reduced and shifted towards the yawed direction. At downstream distance X/D=4 for TSR=6 the wake deficit becomes more uniform for both yawAngle=0^0 and yawAngle=30^0. For the downstream configuration the yaw moment was generally stable at more operating conditions than the upstream setup. Common for both configurations was that the yaw moment tended to rotate the rotor plane out of the wind at low tip speed ratios and yaw angles. The downwind turbine got a stabilizing moment for a lower tip speed ratio than the upwind turbine for all yaw angles. Both upwind and downwind turbine setup had an unconditionally stable yaw moment for yawAngle=30^0.
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Wilmshurst, Stephen Michael Brand. "Wind turbine performance and dynamics." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236111.

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The work described in the dissertation consists of various experimental investigations involving a 5 metre diameter horizontal-axis wind turbine at the Cambridge field test site and a model wind turbine in the low-speed wind tunnel at the Central Electricity Research Laboratories. The first chapter is introductory, summarising previous work by the author's research group and placing the present work in its wider context. The second chapter describes measurements and analysis of the problem of tower shadow for a downwind turbine - the 5m machine - including the use of a streamlined fairing to alleviate the problem. There follow three chapters relating to the broad area of wind turbine performance. The first of these reports how power measurements made in two different ways have been used to define the performance of the 5m machine, giving results in good agreement with theoretical predictions. The next discussed the use of blade-mounted spoilers as a control mechanism and describes experiments which have been carried out with spoilers of a simple design. Chapter 5 concerns the subject of control strategies. Both computer simulation and experimental results are presented for several different operating strategies, with particular attention to the impact on power production. The final chapter describes work carried out in a wind tunnel using a small model turbine. A comprehensive investigation of the model's wake has been undertaken and is analysed with reference to blade loading, ambient turbulence and downstream development.
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Books on the topic "Wind turbine"

1

Wagner, S. Wind turbine noise. Berlin: Springer, 1996.

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Wagner, Siegfried, Rainer Bareiß, and Gianfranco Guidati. Wind Turbine Noise. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-88710-9.

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Rivkin, David. Wind turbine systems. Burlington, MA: Jones & Bartlett Learning, 2013.

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Nicolaou, A. C. Wind turbine control. Manchester: UMIST, 1993.

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P, Shepherd Kevin, and Langley Research Center, eds. Wind turbine acoustics. Washington, D.C: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Division, 1990.

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A, Spera David, ed. Wind turbine technology: Fundamental concepts of wind turbine engineering. New York: ASME Press, 1994.

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A, Spera David, and American Society of Mechanical Engineers., eds. Wind turbine technology: Fundamental concepts of wind turbine engineering. New York: ASME Press, 1998.

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A, Spera David, ed. Wind turbine technology: Fundamental concepts of wind turbine engineering. 2nd ed. New York, NY: ASME Press, 2009.

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Hu, Weifei, ed. Advanced Wind Turbine Technology. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78166-2.

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Bianchi, Fernando D., Ricardo J. Mantz, and Hernán De Battista. Wind Turbine Control Systems. London: Springer London, 2007. http://dx.doi.org/10.1007/1-84628-493-7.

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Book chapters on the topic "Wind turbine"

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Bolin, Karl, and Mats Åbom. "Wind Turbine wind turbine Noise Emissions wind turbine noise emissions." In Encyclopedia of Sustainability Science and Technology, 12274–92. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_376.

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Bolin, Karl, and Mats Åbom. "Wind Turbine wind turbine Noise Emissions wind turbine noise emissions." In Renewable Energy Systems, 1843–60. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5820-3_376.

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Hau, Erich. "Wind Turbine Costs." In Wind Turbines, 789–843. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-27151-9_19.

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Hau, Erich. "Wind Turbine Economics." In Wind Turbines, 845–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-27151-9_20.

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Hau, Erich. "Wind Turbine Installation and Operation." In Wind Turbines, 719–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-27151-9_18.

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Wagner, Siegfried, Rainer Bareiß, and Gianfranco Guidati. "Introduction." In Wind Turbine Noise, 1–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-88710-9_1.

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Wagner, Siegfried, Rainer Bareiß, and Gianfranco Guidati. "References." In Wind Turbine Noise, 183–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-88710-9_10.

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Wagner, Siegfried, Rainer Bareiß, and Gianfranco Guidati. "Noise and its Effects." In Wind Turbine Noise, 13–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-88710-9_2.

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Wagner, Siegfried, Rainer Bareiß, and Gianfranco Guidati. "Introduction to Aeroacoustics." In Wind Turbine Noise, 27–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-88710-9_3.

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Wagner, Siegfried, Rainer Bareiß, and Gianfranco Guidati. "Noise Mechanisms of Wind Turbines." In Wind Turbine Noise, 67–92. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-88710-9_4.

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Conference papers on the topic "Wind turbine"

1

Briggs, C. "Proactive turbine maintenance integrated support for wind turbine operations." In Offshore Wind Technology. Institution of Engineering and Technology, 2015. http://dx.doi.org/10.1049/ic.2015.0067.

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Petrovic, Vlaho, and Carlo L. Bottasso. "Wind Turbine Envelope Riding." In 33rd Wind Energy Symposium. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2015. http://dx.doi.org/10.2514/6.2015-1213.

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Jericha, H., E. Göttlich, and W. Sanz. "Novel Wind Turbine for Catabatic Winds." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69263.

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On many sea shores around the world high speed winds fall down from mountains and flow horizontally over the sea surface close to the shore. A new wind turbine design is presented which is able to catch this energy. The engine is intended to be mounted on a bridge between two ship bodies similar to a catamaran. Wind enters horizontally — the wind turbine resembling a very large jet engine — and is reduced in speed by a diffuser. The blade arrangement is similar to a last stage steam turbine ahead of a condenser. Power is produced by this single stage reaction turbine. The deficiency of flow power at the turbine outlet is counteracted by energy from the surrounding air flow by feeding bypass air into the outlet area behind the rotor blades. The now increased flow carries sufficient flow power to pass through the outlet diffuser and to reach the pressure conditions behind the wind turbine. The wind turbine rotor drives the electrical power generator via a planetary gear box. Hydrogen and Oxygen generated by electrolysers are proposed to be used as energy storage.
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Li, Simeng, and J. Iwan D. Alexander. "Optimization of Wind Turbine Placement in Offshore Wind Farms." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47935.

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In this paper, a Genetic Algorithm is used to find optimized spatial configurations of wind turbines in offshore or flat terrain wind farms. The optimization is made by obtaining maximizing power output per unit cost. A wake model which permits the calculation of single wakes, multiple wakes and wake interactions is employed to estimate wind speeds at each turbine for a given external wind distribution function and a given spatial configuration. The optimization is applied to cases of unidirectional wind, variable direction winds and variable wind speed. The placement of a turbine can be set at any location following the approach of Mittal et al. Results are obtained for different spacing limits between turbines and wind farms of different sizes. The results for some patterns of optimized placements of wind turbines are discussed in the context of the wind distributions and the wake model employed.
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Vaheeshan, J., V. Vihirthanath, S. G. Abeyaratne, A. Atputharajah, and G. Ramatharan. "Wind Turbine Emulator." In 2011 IEEE 6th International Conference on Industrial and Information Systems (ICIIS). IEEE, 2011. http://dx.doi.org/10.1109/iciinfs.2011.6038123.

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Kishore, Ravi Anant, and Shashank Priya. "Piezoelectric wind turbine." In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, edited by Kevin M. Farinholt and Steven F. Griffin. SPIE, 2013. http://dx.doi.org/10.1117/12.2009551.

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Amano, Ryoichi S., and Randall Jackson. "WIND TURBINE AERODYNAMICS." In Second Thermal and Fluids Engineering Conference. Connecticut: Begellhouse, 2017. http://dx.doi.org/10.1615/tfec2017.emi.018626.

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Kirby, Andrew C., Arash Hassanzadeh, Dimitri J. Mavriplis, and Jonathan W. Naughton. "Wind Turbine Wake Dynamics Analysis Using a High-Fidelity Simulation Framework with Blade-Resolved Turbine Models." In 2018 Wind Energy Symposium. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0256.

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Castillo, Ricardo, Yeqin Wang, Suhas Pol, Andy Swift, and Carsten Westergaard. "Real time controlled wind turbine wake simulator." In 35th Wind Energy Symposium. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-1616.

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van Garrel, Arne, Sebastiaan ten Pas, Kees Venner, and Jaap van Muijden. "Wind Turbine Aerodynamics from an Aerospace Perspective." In 2018 Wind Energy Symposium. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2018. http://dx.doi.org/10.2514/6.2018-0991.

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Reports on the topic "Wind turbine"

1

Kelley, Christopher Lee, David Charles Maniaci, and Brian R. Resor. Wind Turbine Wakes. Office of Scientific and Technical Information (OSTI), October 2015. http://dx.doi.org/10.2172/1331504.

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Peek, Richard T. Swift Wind Turbine Testing. Office of Scientific and Technical Information (OSTI), July 2013. http://dx.doi.org/10.2172/1088038.

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Cheraghi, S. Hossein, and Frank Madden. Next Generation Wind Turbine. Office of Scientific and Technical Information (OSTI), September 2012. http://dx.doi.org/10.2172/1326374.

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Bartlett, Raymond J. PowerJet Wind Turbine Project. Office of Scientific and Technical Information (OSTI), November 2008. http://dx.doi.org/10.2172/969476.

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Greco, Aaron, Nick Demas, Robert Erck, Ben Gould, Jon Keller, Shawn Sheng, and Yi Guo. Wind Turbine Drivetrain Reliability. Office of Scientific and Technical Information (OSTI), October 2022. http://dx.doi.org/10.2172/1896902.

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Huskey, A., A. Bowen, and D. Jager. Wind Turbine Generator System Duration Test Report for the Gaia-Wind 11 kW Wind Turbine. Office of Scientific and Technical Information (OSTI), September 2010. http://dx.doi.org/10.2172/989018.

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Huskey, A., A. Bowen, and D. Jager. Wind Turbine Safety and Function Test Report for the Gaia-Wind 11-kW Wind Turbine. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/971439.

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Walford, Christopher A. Wind turbine reliability :understanding and minimizing wind turbine operation and maintenance costs. Office of Scientific and Technical Information (OSTI), March 2006. http://dx.doi.org/10.2172/882048.

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Curtis, A., and V. Gevorgian. Wind Turbine Generator System Power Quality Test Report for the Gaia Wind 11-kW Wind Turbine. Office of Scientific and Technical Information (OSTI), July 2011. http://dx.doi.org/10.2172/1020598.

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Huskey, A., A. Bowen, and D. Jager. Wind Turbine Generator System Power Performance Test Report for the Gaia-Wind 11-kW Wind Turbine. Office of Scientific and Technical Information (OSTI), December 2009. http://dx.doi.org/10.2172/969721.

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