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Journal articles on the topic 'Shrouded Wind Turbine'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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1

Sontakke, Kishor, Samir Deshmukh, and Sandip Patil. "Potential of Shrouded Micro Wind Turbine." IRA-International Journal of Technology & Engineering (ISSN 2455-4480) 7, no. 2 (S) (2017): 340. http://dx.doi.org/10.21013/jte.icsesd201732.

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The growing demand for electrical energy for industrial and domestic use, coupled with the limited amount of available fossil fuel reserves and its negative effects on the environment, have made it necessary to seek alternative and renewable energy sources. The use of renewable energy is promoted worldwide to be less dependent on conventional fuels and nuclear energy. Therefore research in the field is motivated to increase efficiency of renewable energy systems. This study aimed to study potential of micro wind turbine and velocity profile through shroud for low wind speeds. Although there is a greater inclination to use solar panels because of the local weather conditions, there are some practical implications that have place the use of solar panels in certain areas to an end. The biggest problem is panel stealing. Also, in some parts of the country the weather is more appropriate to apply wind turbines. Thus, this study paying attention on the design of a new concept to improve wind turbines to be appropriate for the low wind speeds in India. The concept involves the implementation of a concentrator and diffuser to a wind turbine, to increase the power coefficient. Although the wind turbine was not tested for starting speeds, the realization of the shroud should contribute to improved starting of the wind turbine at lower wind speeds. The configuration were not manufactured, but simulated with the use of a program to obtain the power production of the wind turbine over a range of wind speeds. These values were compared to measured results of an open wind turbine developed. The most important topic at hand when dealing with a shrouded wind turbine is to find out if the overall diameter or the blade diameter of the turbine should be the point of reference. As the wind turbine is situated in a shroud that has a larger diameter than the turbine blades, some researchers believe that the overall diameter should be used to calculate the efficiency. The benefits of shrouded wind turbines are discussed.
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2

Puthumana, Amal B. "Inlet Shroud Angle of a Shrouded Wind Turbine." International Journal for Research in Applied Science and Engineering Technology V, no. IV (2017): 295–302. http://dx.doi.org/10.22214/ijraset.2017.4054.

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3

Takey, Mohamed, Tholudin Mat Lazim, Iskandar Shah Ishak, N. A. R. Nik Mohd, and Norazila Othman. "Computational Investigation of a Wind Turbine Shrouded with a Circular Ring." CFD Letters 12, no. 10 (2020): 40–51. http://dx.doi.org/10.37934/cfdl.12.10.4051.

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In this research work, a new design concept for shrouded turbines is introduced using a circular flange ring instead of a diffuser. The performance of a wind turbine shrouded with the conventional configuration of flanged diffusers is firstly investigated. This allows comparison to be made with the performance of the new design proposed in this project. The bare turbine used in this research work is a horizontal axis wind turbine with a diameter of 0.6 m, and the flange height is 10% of the diameter. The performance of the shrouded turbine is investigated using computational fluid dynamics; by solving the flow field using three-dimensional Reynolds Averaged Navier-Stokes for incompressible flow. Findings indicate that the performance of the turbine shrouded with the flange ring is superior to the bare turbine by 33%. It also has benefit over the conventional design as this new design concept is simpler and uses lesser material since it is not using the diffuser, which favorably in turn will reduce the cost. Subsequently, the findings of this research may have the potential to expedite the developments of green-source energy that undoubtedly could benefit the entire growing wind turbine industry.
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4

Nasrul, Muhammad, and Illa Rizianiza. "Shrouded wind turbine for low wind speed." IOP Conference Series: Materials Science and Engineering 1034, no. 1 (2021): 012042. http://dx.doi.org/10.1088/1757-899x/1034/1/012042.

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5

Kosasih, Bu Yung, and S. A. Jafari. "High-Efficiency Shrouded Micro Wind Turbine for Urban-Built Environment." Applied Mechanics and Materials 493 (January 2014): 294–99. http://dx.doi.org/10.4028/www.scientific.net/amm.493.294.

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Shrouding (diffuser augmented) horizontal axis micro-wind turbine has been shown to be an effective ways to potentially increase the power output of micro wind turbine for applications in built environments. It is well understood that the degree of the performance enhancement depends on several factors including the diffuser shape and geometries, blade airfoils, and the wind condition at the turbine site. The effect of diffuser shape and geometries is reported in this paper. Computational fluid dynamic (CFD) simulations of a small wind turbine with a simple frustum diffuser shrouding have been carried out. The diffuser has been modeled with different shapes with the aim to understand the effect of length and area ratio on power augmentation phenomenon. The simulations provide some parameterized figures which present method to determine the beneficial range of frustum diffuser geometries for diffuser shrouded horizontal axis wind turbines.
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6

Khojasteh, Hasanali, Younes Noorollahi, Mojtaba Tahani, and Mehran Masdari. "Optimization of Power and Levelized Cost for Shrouded Small Wind Turbine." Inventions 5, no. 4 (2020): 59. http://dx.doi.org/10.3390/inventions5040059.

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Nowadays, by increasing energy demand and considering the importance of environmental issues in recent decades, the use of renewable energies is expanding. Among renewable energies, wind power and its technology are growing and evolving more rapidly. Resource assessment in Iran has revealed the significant potential of wind energy around the country. To further develop wind energy in the country and create large-scale wind power plants, the consideration of distributed power generation using small wind turbines for applications in agricultural and residential use is needed. Conventional small wind turbines and small wind lens turbines have been developed in recent years. In this research project, a small wind lens turbine is designed. The advantages of this turbine are an increased production capacity and reduced cut-in speed and noise pollution. In this study, a lens (or shroud) is added to a small turbine, and the maximized annual energy production (AEP) and minimization of the levelized cost of energy (LCOE) are modeled. We applied the NSGA-II algorithm for optimization to find the best answer. The input parameters in the objective function of the AEP are cut-in, cut-out, rated speeds, scale factor, and shape factor. Additionally, the input parameters in the objective function of the LCOE are the power production, initial capital cost, annual operating expenses, and balance of energy. The results indicate that installing a wind lens turbine in Kish Island led to an LCOE decrease of 56% on average, and we can see an 83% increase in the AEP. In the Firoozkooh area, an average reduction of 59% in the LCOE and 74% increase in the AEP for a wind lens turbine is observed.
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7

Kosasih, Buyung, and Andrea Tondelli. "Experimental Study of Shrouded Micro-Wind Turbine." Procedia Engineering 49 (2012): 92–98. http://dx.doi.org/10.1016/j.proeng.2012.10.116.

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8

Watanabe, Koichi, and Yuji Ohya. "A Simple Theory and Performance Prediction for a Shrouded Wind Turbine with a Brimmed Diffuser." Energies 14, no. 12 (2021): 3661. http://dx.doi.org/10.3390/en14123661.

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We developed a new wind turbine system that consists of a diffuser shroud with a broad-ring brim at the exit periphery and a wind turbine inside it. The shrouded wind turbine with a brimmed diffuser, which we called a “wind lens turbine” (WLT), has demonstrated power augmentation by a factor of about 2–5 compared with a bare wind turbine for a given turbine diameter and wind speed. The increase in power output depends on the diffuser shape and length and the brim height. However, a simple theory presented in this paper argues that only two performance coefficients are needed to predict the performance of WLT. The coefficients are the back pressure coefficient of the brim and the pressure recovery coefficient of the diffuser. We theoretically showed that the back pressure coefficient was particularly important for the performance of WLT. Finally, the simple theory was evaluated with experimental results. The results showed good agreement with each other.
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9

Lipian, Michal, Ivan Dobrev, Fawaz Massouh, and Krzysztof Jozwik. "Small wind turbine augmentation: Numerical investigations of shrouded- and twin-rotor wind turbines." Energy 201 (June 2020): 117588. http://dx.doi.org/10.1016/j.energy.2020.117588.

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10

Lipian, Michal, Ivan Dobrev, Maciej Karczewski, Fawaz Massouh, and Krzysztof Jozwik. "Small wind turbine augmentation: Experimental investigations of shrouded- and twin-rotor wind turbine systems." Energy 186 (November 2019): 115855. http://dx.doi.org/10.1016/j.energy.2019.115855.

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11

Riyanto, Nugroho Agung Pambudi, Rusdi Febriyanto, et al. "The Performance of Shrouded Wind Turbine at Low Wind Speed Condition." Energy Procedia 158 (February 2019): 260–65. http://dx.doi.org/10.1016/j.egypro.2019.01.086.

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12

Keramat Siavash, Nemat, G. Najafi, Teymour Tavakkoli Hashjin, Barat Ghobadian, and Esmail Mahmoodi. "Mathematical modeling of a horizontal axis shrouded wind turbine." Renewable Energy 146 (February 2020): 856–66. http://dx.doi.org/10.1016/j.renene.2019.07.022.

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13

Ohya, Yuji, and Takashi Karasudani. "A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology." Energies 3, no. 4 (2010): 634–49. http://dx.doi.org/10.3390/en3040634.

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14

Saleh, Zainab, Eldad J. Avital, and Theodosios Korakianitis. "Effect of in-service burnout on the transonic tip leakage flows over flat tip model." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 234, no. 5 (2019): 655–69. http://dx.doi.org/10.1177/0957650919877057.

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Un-shrouded turbine blades are more common than shrouded ones in gas turbine aero-engines since they reduce the weight and avoid the centrifugal loading caused by the blades’ shrouds. Despite these important advantages, the absence of the shroud leads to leakage flows across the tip gap and exposes the blade tip to high thermal load and thermal damages. In addition, the leakage flows can contribute up to 30% of the aerodynamic loss in a turbine stage. In this study, the effect of in-service burnout is explored using a fundamental flat tip model of a high-pressure gas turbine blade. This investigation is carried out both experimentally in a transonic wind tunnel and computationally using the Reynolds Averaged Navier-stokes approach at high-speed conditions. It is found that exposing the tip to the in-service burnout effect changes the leakage flow behaviour significantly when compared with the tip with sharp edges (i.e. the tip at the start of its operational life). Different flow acceleration, flow structure and shockwave pattern and interactions are captured for the round-edge flat tip (i.e. the tip exposed to in-service burnout). The effective tip gap is found to be much larger for the round-edge flat tip allowing more leakage flow into the tip gap which results into higher tip leakage losses in comparison to the sharp-edge tip. Experimental and computational flow visualisations, surface pressure distributions and discharge coefficient are given and analysed for several pressure ratios over the tip gap.
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15

Ohya, Yuji, Takashi Karasudani, Akira Sakurai, Ken-ichi Abe, and Masahiro Inoue. "Development of a shrouded wind turbine with a flanged diffuser." Journal of Wind Engineering and Industrial Aerodynamics 96, no. 5 (2008): 524–39. http://dx.doi.org/10.1016/j.jweia.2008.01.006.

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16

Yıldız, R. Erdem, and Abdurrahman Ekinci. "Design and Analysis of Shrouded Small-Scale Wind Turbine for Low Wind Speeds." Journal of Physics: Conference Series 1037 (June 2018): 042017. http://dx.doi.org/10.1088/1742-6596/1037/4/042017.

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17

García, E., R. Pizá, X. Benavides, E. Quiles, A. Correcher, and F. Morant. "Mechanical Augmentation Channel Design for Turbine Current Generators." Advances in Mechanical Engineering 6 (January 1, 2014): 650131. http://dx.doi.org/10.1155/2014/650131.

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We present the design and analysis of augmentation channels to increase the efficiency of shrouded marine current turbines in conditions of low intensity flows. These turbines are part of a prototype of a floating device composed of wind and marine current generators for generating renewable energy. It intends to exploit renewable energy resources in an integrated manner using wind and current turbines in offshore plants optimizing the economic investment.
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18

Hu, Jun-Feng, and Wen-Xue Wang. "Upgrading a Shrouded Wind Turbine with a Self-Adaptive Flanged Diffuser." Energies 8, no. 6 (2015): 5319–37. http://dx.doi.org/10.3390/en8065319.

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19

Ho-Hyun Kim, Ki-Wahn Ryu, Hwi-Chan Ham, and Chae-Yeon Lee. "A Study on Inflow Rate Variation for Shrouded Wind Turbine Rotors." Journal of Wind Energy 7, no. 1 (2016): 34–40. http://dx.doi.org/10.33519/kwea.2016.7.1.006.

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20

Klistafani, Y., and M. I. Mukhsen. "Development of a Shrouded Wind Turbine with Various Diffuser Type Structures." IOP Conference Series: Materials Science and Engineering 676 (December 10, 2019): 012040. http://dx.doi.org/10.1088/1757-899x/676/1/012040.

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21

Lawn, C. J. "Optimization of the power output from ducted turbines." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 217, no. 1 (2003): 107–17. http://dx.doi.org/10.1243/095765003321148754.

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For many years there has been interest in the possibility of enhancing the performance of wind turbines by encasing them in a duct or ‘shroud’, but practical considerations have prevented commercial realization. While this possibility is not ruled out, more beneficial schemes for shrouding may well arise for water turbines in tidal streams. In this paper, the performance of a shrouded turbine has been analysed using one-dimensional theory by treating the ducts upstream and downstream of the turbine as contractions or expansions having specified diffusion efficiencies. It is shown that, for given diffuser efficiencies, there is an optimum turbine resistance for generating maximum power, because the swallowing capacity of the duct is increased as the resistance decreases. Simple experiments with static resistance elements in the duct have confirmed this theory for the swallowing capacity and shown that there is little to be gained by controlled diffusion at inlet. However, efficient controlled diffusion at outlet can lead to power enhancements of more than 30 per cent over an optimized turbine of the same area in the freestream. To achieve this, a more lightly loaded turbine must be utilized. Claims in the literature of much greater enhancements than this are sometimes made in relation to non-optimized conditions for the freestream case. The alternative requirement, that maximum power should be extracted from a given inlet area, is also analysed and shown to require a highly loaded turbine.
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22

Dilimulati, Aierken, Ted Stathopoulos, and Marius Paraschivoiu. "Wind turbine designs for urban applications: A case study of shrouded diffuser casing for turbines." Journal of Wind Engineering and Industrial Aerodynamics 175 (April 2018): 179–92. http://dx.doi.org/10.1016/j.jweia.2018.01.003.

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23

FURUKAWA, Masato, Sung Hyup KIM, Yoshikazu TANAKA, Masahiro INOUE, and Yuji OHYA. "Three-Dimensional Vortical Flow Structure Around Shrouded Wind Turbine With Brimmed Diffuser." Proceedings of the Fluids engineering conference 2003 (2003): 88. http://dx.doi.org/10.1299/jsmefed.2003.88.

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24

ODAHARA, Satoru, Wen-Xue Wang, and Hideki NISHIMURA. "2G5 Effects of Shrouded Duct on Vibration Properties of Wind-lens Turbine." Proceedings of Conference of Kyushu Branch 2013 (2013): 215–16. http://dx.doi.org/10.1299/jsmekyushu.2013.215.

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25

Oliveira, Jefferson A., and Ály F. Flores Filho. "Performance Evaluation of a Stator Modular Ring Generator for a Shrouded Wind Turbine." Energies 14, no. 1 (2020): 67. http://dx.doi.org/10.3390/en14010067.

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This paper presents the performance evaluation of a stator modular ring permanent-magnet generator to be embedded in a shrouded wind turbine. That is done to increase the power conversion for the same turbine area when compared to more conventional ones. An adapted structure allows the assembling of the prototype, aiming to verify its performance under controlled conditions. Aiming to verify the accuracy of an analytical subdomain model for a large diameter machine, the evaluation compares the results obtained by the electromagnetic finite element method and experimental measurements. The results of the components of the air-gap flux density, back EMF and electromagnetic torque obtained by the proposed analytical model and finite-element method are in good agreement with the experimental measurements. The experimental measurements of the iron loss and copper loss show that the prototype efficiency can reach 90% approximately.
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26

Patil, Ms Sonali Mangesh. "Computational Fluid Dynamics Analysis of Wind Lens." International Journal for Research in Applied Science and Engineering Technology 9, no. VIII (2021): 381–94. http://dx.doi.org/10.22214/ijraset.2021.37252.

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The wind-lens turbine consist of shrouded diffuser which increases the wind speed at rotor, developing electric power even in low speed wind. Energy crisis is one of the major problems facing the countries globally. One of the methods to overcome energy trouble is to use the energy available efficiently and also to reduce the energy that is being wasted. The fact that non-renewable sources of energy become cause of pollution and the increased ecological hazards and their rate of depletion has required to use of nonconventional and renewable sources. Therefore to adopt the methods of energy recovery is required. Energy recovery is a technique used to reduce the vitality input to an overall system by exchanging the energy from one system of an overall system to another. Wind lens turbine is the next generation small wind which can be installed anywhere. It has significant reduction in wind turbine noise, concentration of wind energy, compact and highly efficient, adaptable to the surroundings, highly safe systems and significant reduction in birds strike.
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27

Olasek, Krzysztof, Maciej Karczewski, Michal Lipian, Piotr Wiklak, and Krzysztof Józwik. "Wind tunnel experimental investigations of a diffuser augmented wind turbine model." International Journal of Numerical Methods for Heat & Fluid Flow 26, no. 7 (2016): 2033–47. http://dx.doi.org/10.1108/hff-06-2015-0246.

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Purpose A solution to increase the energy production rate of the wind turbine is proposed by forcing more air to move through the turbine working section. This can be achieved by equipping the rotor with a diffusing channel ended with a brim (diffuser augmented wind turbine – DAWT). The purpose of this paper is to design an experimental stand and perform the measurements of velocity vector fields through the diffuser and power characteristic of the wind turbine. Design/methodology/approach The experiments were carried out in a small subsonic wind tunnel at the Institute of Turbomachinery, Lodz University of Technology. An experimental stand design process as well as measurement results are presented. Model size sensitivity study was performed at the beginning. The experimental campaign consisted of velocity measurements by means of particle image velocimetry (PIV) and pneumatic pitot probe as well as torque and rotational velocity measurements. Findings Characteristics (power coefficient vs tip speed ratio) of the bare and shrouded wind turbine were obtained. The results show an increase in the wind turbine power up to 70-75 per cent by shrouding the rotor with a diffuser. The mechanisms responsible for such a power increase were well explained by the PIV and pneumatic measurement results revealing the nature of the flow through the diffuser. Research limitations/implications Experimental stand for wind turbine rotor testing is of a preliminary character. Most optimal methodology for obtaining power characteristic should be determined now. Presented results can serve as good input for choice of stable and reliable control system of wind turbine operational parameters. Practical implications A 3 kW DAWT is being developed at the Institute of Turbomachinery, Lodz University of Technology. Aim of the study is to design a compact and smart wind turbine optimised for low wind speed conditions. Developed wind turbine has a potential to be used as an effective element within a net of distributed generation, e.g. for domestic use. Originality/value Research carried out is the continuation of theoretical study began in 1970s. It was also inspired by practical solutions proposed by Japanese researchers few years ago. Presented paper is the summary of work devoted to optimisation of the DAWT for wind conditions in the region. Original solution has been applied, e.g. for experimental stand design (3D printing application).
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28

Zhu, Hongzhong, Makoto Sueyoshi, Changhong Hu, and Shigeo Yoshida. "A study on a floating type shrouded wind turbine: Design, modeling and analysis." Renewable Energy 134 (April 2019): 1099–113. http://dx.doi.org/10.1016/j.renene.2018.09.028.

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29

Aranake, Aniket C., Vinod K. Lakshminarayan, and Karthik Duraisamy. "Computational analysis of shrouded wind turbine configurations using a 3-dimensional RANS solver." Renewable Energy 75 (March 2015): 818–32. http://dx.doi.org/10.1016/j.renene.2014.10.049.

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30

SUGITA, Yusuke, Mahiro UEDA, and Masato FURUKAWA. "1819 Flow Structure Around a Wind Turbine Shrouded by Compact-type Brimmed Diffuser." Proceedings of the Fluids engineering conference 2005 (2005): 276. http://dx.doi.org/10.1299/jsmefed.2005.276.

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31

Howey, D. A., A. Bansal, and A. S. Holmes. "Design and performance of a centimetre-scale shrouded wind turbine for energy harvesting." Smart Materials and Structures 20, no. 8 (2011): 085021. http://dx.doi.org/10.1088/0964-1726/20/8/085021.

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32

OHYA, Yuji, Shusaku IBA, Takashi KARASUDANI, and Kimihiko WATANABE. "503 Development of a Shrouded Wind Turbine Equipped with a Compact Brimmed Diffuser(2)." Proceedings of the Fluids engineering conference 2006 (2006): _503–1_—_503–4_. http://dx.doi.org/10.1299/jsmefed.2006._503-1_.

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33

OHYA, Yuji, Shusaku IBA, Takashi KARASUDANI, and Kimihiko WATANABE. "503 Development of a Shrouded Wind Turbine Equipped with a Compact Brimmed Diffuser(1)." Proceedings of the Fluids engineering conference 2006 (2006): _503—a_. http://dx.doi.org/10.1299/jsmefed.2006._503-a_.

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34

Ghenai, Chaouki, Meera A. Rasheed, Maitha J. Alshamsi, Maryam A. Alkamali, Fahad F. Ahmad, and Abrar Inayat. "Design of Hybrid Solar Photovoltaics/Shrouded Wind Turbine Power System for Thermal Pyrolysis of Plastic Waste." Case Studies in Thermal Engineering 22 (December 2020): 100773. http://dx.doi.org/10.1016/j.csite.2020.100773.

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35

Jafari, S. A. H., and B. Kosasih. "Flow analysis of shrouded small wind turbine with a simple frustum diffuser with computational fluid dynamics simulations." Journal of Wind Engineering and Industrial Aerodynamics 125 (February 2014): 102–10. http://dx.doi.org/10.1016/j.jweia.2013.12.001.

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36

Wang, Wen-Xue, Terutake Matsubara, Junfeng Hu, et al. "Experimental investigation into the influence of the flanged diffuser on the dynamic behavior of CFRP blade of a shrouded wind turbine." Renewable Energy 78 (June 2015): 386–97. http://dx.doi.org/10.1016/j.renene.2015.01.028.

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37

Rehder, Hans-Jürgen, and Axel Dannhauer. "Experimental Investigation of Turbine Leakage Flows on the Three-Dimensional Flow Field and Endwall Heat Transfer." Journal of Turbomachinery 129, no. 3 (2006): 608–18. http://dx.doi.org/10.1115/1.2720484.

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Within a European research project, the tip endwall region of low pressure turbine guide vanes with leakage ejection was investigated at DLR in Göttingen. For this purpose a new cascade wind tunnel with three large profiles in the test section and a contoured endwall was designed and built, representing 50% height of a real low pressure turbine stator and simulating the casing flow field of shrouded vanes. The effect of tip leakage flow was simulated by blowing air through a small leakage gap in the endwall just upstream of the vane leading edges. Engine relevant turbulence intensities were adjusted by an active turbulence generator mounted in the test section inlet plane. The experiments were performed with tangential and perpendicular leakage ejection and varying leakage mass flow rates up to 2%. Aerodynamic and thermodynamic measurement techniques were employed. Pressure distribution measurements provided information about the endwall and vane surface pressure field and its variation with leakage flow. Additionally streamline patterns (local shear stress directions) on the walls were detected by oil flow visualization. Downstream traverses with five-hole pyramid type probes allow a survey of the secondary flow behavior in the cascade exit plane. The flow field in the near endwall area downstream of the leakage gap and around the vane leading edges was investigated using a 2D particle image velocimetry system. In order to determine endwall heat transfer distributions, the wall temperatures were measured by an infrared camera system, while heat fluxes at the surfaces were generated with electric operating heating foils. It turned out from the experiments that distinct changes in the secondary flow behavior and endwall heat transfer occur mainly when the leakage mass flow rate is increased from 1% to 2%. Leakage ejection perpendicular to the main flow direction amplifies the secondary flow, in particular the horseshoe vortex, whereas tangential leakage ejection causes a significant reduction of this vortex system. For high leakage mass flow rates the boundary layer flow at the endwall is strongly affected and seems to be highly turbulent, resulting in entirely different heat transfer distributions.
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38

Madadnia, Jafar, Deepak Kala, Dheerej Pillai, and Homa Koosha. "Design, Build and Testing of a Noise-Free Twin Shaft Co-Axial Wind Turbine for UTS Buildings." Advanced Materials Research 452-453 (January 2012): 1089–93. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.1089.

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Management and control of noise pollution in wind turbines are important to integrate wind turbines in building and urban areas. A scaled model of a horizontal-co-axial wind turbine was designed, built and tested in the wind tunnel of University of Technology Sydney (UTS) and its characteristics and aerodynamic-noise emissions were analyzed. The noise reduction capability of the horizontal-twin-shaft wind turbines was compared with wind turbines with the conical entry nozzle (stator), duct-shroud-envelop and vertical shafts. Air velocity, shaft rpm, electric-power generation, noise frequency and amplitude were measured. It was found that up to 15% reduction in the amplitude (dB) of noise emisit from twin shaft wind turbine compared to the single shaft bench mark turbine. The noise analysis performed as a result of these experiments may be used in the design and selection of a building integrated horizontal axis wind turbine for applications at UTS buildings.
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39

Aranake, A., and K. Duraisamy. "Aerodynamic optimization of shrouded wind turbines." Wind Energy 20, no. 5 (2016): 877–89. http://dx.doi.org/10.1002/we.2068.

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40

Al-Sulaiman, Fahad A., and Bekir S. Yilbas. "Thermoeconomic analysis of shrouded wind turbines." Energy Conversion and Management 96 (May 2015): 599–604. http://dx.doi.org/10.1016/j.enconman.2015.02.034.

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41

Abu-Thuraia, H., C. Aygun, M. Paraschivoiu, and M. A. Allard. "Computational fluid dynamic analysis of roof-mounted vertical-axis wind turbine with diffuser shroud, flange, and vanes." Transactions of the Canadian Society for Mechanical Engineering 42, no. 4 (2018): 404–15. http://dx.doi.org/10.1139/tcsme-2017-0093.

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Advances in wind power and tidal power have matured considerably to offer clean and sustainable energy alternatives. Nevertheless, distributed small-scale energy production from wind in urban areas has been disappointing because of very low efficiencies of the turbines. A novel wind turbine design — a seven-bladed Savonius vertical-axis wind turbine (VAWT) that is horizontally oriented inside a diffuser shroud and mounted on top of a building — has been shown to overcome the drawback of low efficiency. The objective this study was to analyze the performance of this novel wind turbine design for different wind directions and for different guide vanes placed at the entrance of the diffuser shroud. The flow field over the turbine and guide vanes was analyzed using computational fluid dynamics (CFD) on a 3D grid for multiple tip-speed ratios (TSRs). Four wind directions and three guide-vane angles were analyzed. The wind-direction analysis indicates that the power coefficient decreases to about half when the wind is oriented at 45° to the main axis of the turbine. The analysis of the guide vanes indicates a maximum power coefficient of 0.33 at a vane angle of 55°.
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42

Khamlaj, Tariq, and Markus Rumpfkeil. "Theoretical Analysis of Shrouded Horizontal Axis Wind Turbines." Energies 10, no. 1 (2017): 38. http://dx.doi.org/10.3390/en10010038.

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43

Al-Sulaiman, Fahad A. "Exergoeconomic analysis of ejector-augmented shrouded wind turbines." Energy 128 (June 2017): 264–70. http://dx.doi.org/10.1016/j.energy.2017.04.041.

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44

Werle, Michael J. "Wall Blockage Correction for Shrouded Wind Turbines and Propellers." Journal of Propulsion and Power 32, no. 2 (2016): 265–72. http://dx.doi.org/10.2514/1.b35022.

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45

Ranjbar, Mohammad Hassan, Behnam Rafiei, Seyyed Abolfazl Nasrazadani, et al. "Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct." Energies 14, no. 18 (2021): 5780. http://dx.doi.org/10.3390/en14185780.

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Efforts to increase the power output of wind turbines include Diffuser Augmented Wind Turbines (DAWT) or a shroud for the rotor of a wind turbine. The selected duct has three main components: a nozzle, a diffuser, and a flange. The combined effect of these components results in enriched upstream velocity for the rotor installed in the throat of the duct. To obtain the maximum velocity in the throat of the duct, the optimum angles of the three parts have been analyzed. A code was developed to allow all the numerical steps including changing the geometries, generating the meshes, and setting up the numerical solver simultaneously. Finally, the optimum geometry of the duct has been established that allows a doubling of the flow velocity. The flow characteristics inside the duct have also been analyzed in detail. An H-Darrieus Vertical Axis Wind Turbine (VAWT) has been simulated inside the optimized duct. The results show that the power coefficient of the DAWT can be enhanced up to 2.9 times. Deep dynamic stall phenomena are captured perfectly. The duct advances the leading-edge vortex generation and delays the vortex separation.
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46

Werle, Michael J. "An enhanced analytical model for airfoil‐based shrouded wind turbines." Wind Energy 23, no. 8 (2020): 1711–25. http://dx.doi.org/10.1002/we.2511.

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47

Halawa, Amr M., Takanori Uchida, Koichi Watanabe, and Yuji Ohya. "Validation Study of Multi-Rotor Systems Using Two Shrouded Wind Turbines." Journal of Physics: Conference Series 1618 (September 2020): 032017. http://dx.doi.org/10.1088/1742-6596/1618/3/032017.

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48

Kumar, K. Ramesh, and M. Selvaraj. "Review on Energy Enhancement Techniques of Wind Turbine System." Advances in Science and Technology 106 (May 2021): 121–30. http://dx.doi.org/10.4028/www.scientific.net/ast.106.121.

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Wind energy is the quickest growing sustainable energy resource in present energy crisis scenario. It has been considered as one of the most viable sources of environmental friendly energy. Starting investment cost of the wind turbine plant is exorbitant. Moreover, production cost of the wind turbine blade is about 20% of the wind turbine plant cost. It is fundamental to decrease the life-cycle cost of wind turbine plant by efficient utilization available wind speed. Optimized diffuser (Convergent divergent type and Convergent type) has been developed with highest possible pressure difference between inlet and exit of shroud, Area Ratio of inlet to exit section, wall length, incident angle and various flow qualities to enhance the available wind velocity considerably. The suitable tiny riblets on external layer of turbine blade have been introduced to lessen the skin friction drag force. Moreover, dual rotor blade with various rotor sizes for primary and secondary rotor, direction of rotor rotation, separation distance between them has been studied to augment wind turbine power generation and improvement in cut-in-speed. Moreover, comparative study will be conducted with standard (bare) wind turbine. Based on the above features, available wind speed increased significantly. In addition, various experiments and CFD analysis work still to be done to assess Diffuser based Wind Turbine model which is much closer to realistic product with available interaction. Due to the above additional features of the turbine system, the utilization of wind speed gets augmented with greater power production.
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49

Keramat Siavash, Nemat, G. Najafi, Teymour Tavakkoli Hashjin, Barat Ghobadian, and Esmail Mahmoodi. "An innovative variable shroud for micro wind turbines." Renewable Energy 145 (January 2020): 1061–72. http://dx.doi.org/10.1016/j.renene.2019.06.098.

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50

Kumar, Vedant, and Sandeep Saha. "Theoretical performance estimation of shrouded-twin-rotor wind turbines using the actuator disk theory." Renewable Energy 134 (April 2019): 961–69. http://dx.doi.org/10.1016/j.renene.2018.11.077.

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