Relevant bibliographies by topics / Betzův limit

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Betzův limit'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Betzův limit"

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Freda, Robert, Bradford Knight, and Siddharth Pannir. "A Theory for Power Extraction from Passive Accelerators and Confined Flows." Energies 13, no. 18 (2020): 4854. http://dx.doi.org/10.3390/en13184854.

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No accepted fluid theory exists for power extraction from unpressurized confined flow. The absence of a valid model to determine baseline uniform power extraction in confined flows creates difficulties in characterizing the coefficient of power. Currently, the primary body of research has been limited to Diffuser Augmented Wind Turbines (DAWTs) and passive fluid accelerators. Fluid power is proportional to the cube of velocity; therefore, passive acceleration is a promising path to effective renewable energy. Hypothetical models and experiments for passive accelerators yield low ideal power li
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Allahverdyan, A. E., and E. A. Khalafyan. "Reexamination of Betz’s Limit for Wind Engines." Journal of Contemporary Physics (Armenian Academy of Sciences) 56, no. 1 (2021): 38–46. http://dx.doi.org/10.3103/s1068337221010047.

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Cuerva, A., and A. Sanz-Andrés. "The extended Betz–Lanchester limit." Renewable Energy 30, no. 5 (2005): 783–94. http://dx.doi.org/10.1016/j.renene.2004.07.017.

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van Kuik, Gijs A. M. "The Lanchester–Betz–Joukowsky limit." Wind Energy 10, no. 3 (2007): 289–91. http://dx.doi.org/10.1002/we.218.

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Farthing, S. P. "Betz Limit Not an Exact Optimum." Wind Engineering 37, no. 1 (2013): 105–9. http://dx.doi.org/10.1260/0309-524x.37.1.105.

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Vennell, Ross. "Exceeding the Betz limit with tidal turbines." Renewable Energy 55 (July 2013): 277–85. http://dx.doi.org/10.1016/j.renene.2012.12.016.

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De Lellis, Marcelo, Romeu Reginatto, Ramiro Saraiva, and Alexandre Trofino. "The Betz limit applied to Airborne Wind Energy." Renewable Energy 127 (November 2018): 32–40. http://dx.doi.org/10.1016/j.renene.2018.04.034.

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Okulov, V. "Limit cases for rotor theories with Betz optimization." Journal of Physics: Conference Series 524 (June 16, 2014): 012129. http://dx.doi.org/10.1088/1742-6596/524/1/012129.

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Chamorro, Leonardo P., and R. E. A Arndt. "Non-uniform velocity distribution effect on the Betz-Joukowsky limit." Wind Energy 16, no. 2 (2012): 279–82. http://dx.doi.org/10.1002/we.549.

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Loenbaek, Kenneth, Christian Bak, Jens I. Madsen, and Bjarke Dam. "Optimal relationship between power and design-driving loads for wind turbine rotors using 1-D models." Wind Energy Science 5, no. 1 (2020): 155–70. http://dx.doi.org/10.5194/wes-5-155-2020.

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Abstract. We investigate the optimal relationship between the aerodynamic power, thrust loading and size of a wind turbine rotor when its design is constrained by a static aerodynamic load. Based on 1-D axial momentum theory, the captured power P̃ for a uniformly loaded rotor can be expressed in terms of the rotor radius R and the rotor thrust coefficient CT. Common types of static design-driving load constraints (DDLCs), e.g., limits on the permissible root-bending moment or tip deflection, may be generalized into a form that also depends on CT and R. The developed model is based on simple re
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Dissertations / Theses on the topic "Betzův limit"

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Puchnar, Jiří. "Instalace malé větrné elektrárny." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221090.

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This work is focused on the power engineering of the Czech Republic, particularly the alternative and its subset, wind power. Introduction acquaints readers with the state of energy in the country. They're the facts of the historical development of energy in Czechoslovakia and its status today. Representation of particular sources which are involved in the so-called. "Big Energy", their description and production. Each of the resources used is briefly described and discussed basic advantages and disadvantages arising from the nature of the source. It is also outlined the possible development o
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Dočekal, David. "Měřicí pracoviště pro systém vzdálené dodávky energie." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-242852.

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This thesis is focused on the creation of measuring workplace for remote power supply system. This is the measuring of the workplace, engaged in the processing of measured data, the production of electrical energy made by a photovoltaic panel and wind turbines. In the theoretical part, the reader is familiar with the issue of renewable energy sources. The first chapter is about the energy of the wind. Here is described the emergence of the wind, the basic division of wind power, through the production of electrical energy to the measurement itself. The second chapter deals with the solar energ
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Holden, Jacob R. "Experimental Testing and Computational Fluid Dynamics Simulation of Maple Seeds and Performance Analysis as a Wind Turbine." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1481031621058525.

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Oo, Htet Htet Nwe. "Actuator Disk Theory for Compressible Flow." DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1727.

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Because compressibility effects arise in real applications of propellers and turbines, the Actuator Disk Theory or Froude’s Momentum Theory was established for compressible, subsonic flow using the three laws of conservation and isentropic thermodynamics. The compressible Actuator Disk Theory was established for the unducted (bare) and ducted cases in which the disk was treated as the only assembly within the flow stream in the bare case and enclosed by a duct having a constant cross-sectional area equal to the disk area in the ducted case. The primary motivation of the current thesis was to p
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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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Book chapters on the topic "Betzův limit"

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Georgiou, D. P., and N. G. Theodoropoulos. "The Loading of Water Current Turbines: The Betz Limit and Ducted Turbines." In Alternative Energy and Shale Gas Encyclopedia. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119066354.ch58.

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Georgiou, D. P., and N. G. Theodoropoulos. "Maximizing the Loading in Wind Turbine Plants: (A) The Betz Limit, (B) Ducting the Turbine." In Alternative Energy and Shale Gas Encyclopedia. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119066354.ch3.

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Huleihil, Mahmoud, and Gedalya Mazor. "Wind Turbine Power: The Betz Limit and Beyond." In Advances in Wind Power. InTech, 2012. http://dx.doi.org/10.5772/52580.

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McElroy, Michael B. "Power from Wind : Opportunities And Challenges." In Energy and Climate. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190490331.003.0014.

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The key step in generating electricity from wind involves capturing and harvesting the kinetic energy of the wind (the energy presented by the directed motion of the air). The blades of a wind turbine are shaped such that the interaction with wind results in a difference in pressure between the top and bottom of the blades. It is this difference in pressure that causes the blades to rotate. And ultimately it is the rotation of the blades that results in the production of electricity. The physical principle behind the operation of a wind turbine is the same as that that allows a heavy aircraft to stay aloft. The wings of a plane are shaped so that the distance the air has to travel to traverse the underside of the wings is less than the distance it has to move to cross the top. As a result, the flow of air across the top is faster than the flow across the bottom. Bernoulli’s Principle states that the greater the speed of the flow, the lower the pressure and vice versa. The difference in pressure between the top and bottom of the wings is what allows the plane to stay aloft (the pressure below is higher, reflecting the lower wind speed). The net upward force exerted by the pressure difference across the wings compensates for the downward pull of gravity, providing the lift that offsets the weight of the plane. There is a fundamental limit to the extent to which the kinetic energy delivered by the wind can be deployed to turn the blades of the turbine. The absolute limit to the efficiency, derived first by the German physicist Albert Betz and named in his honor (the Betz limit) is 59.3%. With careful design, modern turbines have been able to achieve efficiencies ranging as high as 80% of the Betz limit. They are capable in this case of capturing and making use of as much as 48% of the kinetic energy intercepted by the blades of the turbine and to deploy this power to perform useful functions, most notably to generate electricity.
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Conference papers on the topic "Betzův limit"

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Khan, Shahriar, and Shahriar Khan. "Conflicts In Betz Limit and An Alternative Approach for Wind Turbines." In 2020 IEEE Region 10 Symposium (TENSYMP). IEEE, 2020. http://dx.doi.org/10.1109/tensymp50017.2020.9230876.

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Vafiadis, K., H. Fintikakis, I. Zaproudis, and A. Tourlidakis. "Computational Investigation of a Shrouded Vertical Axis Wind Turbine." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56190.

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In urban areas, it is preferable to use small wind turbines which may be integrated to a building in order to supply the local grid with green energy. The main drawback of using wind turbines in urban areas is that the air flow is affected by the existence of nearby buildings, which in conjunction with the variation of wind speed, wind direction and turbulence may adversely affect wind energy extraction. Moreover, the efficiency of a wind turbine is limited by the Betz limit. One of the methods developed to increase the efficiency of small wind turbines and to overcome the Betz limit is the in
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Nix, Andrew C., Seth A. Lawson, and Robert G. Murphy. "Wind Energy Resource Assessment and Power Production Estimates as an Undergraduate Project." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68438.

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It is common practice to install wind-monitoring stations in geographical locations having high winds to estimate power production prior to installing large-scale wind farms. For the current study, a wind-monitoring program was developed as an educational tool for undergraduate engineering students at West Virginia University. The focus of this paper is not on the results of the assessment, but rather on how this program was used as a hands-on approach for educating students about wind energy and availability. The objective of the student/industry collaborative project was to determine the fea
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Henao, Sebastian, Aldo G. Benavides, and Omar D. López. "Downwind Two-Bladed Wind Turbine Aerodynamic Performance Evaluation Implementing Actuator Line Model." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86549.

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The current trend in the wind power market is to develop large diameter rotors in order to maximize the power extraction from the wind. Those rotors exhibit issues related to blade deflection and structural integrity that can be mitigated implementing design variations that were present on the early wind turbine designs, such as rotors with less than three blades located behind the tower in downwind configuration. This work assesses the aerodynamic performance of a downwind two-bladed wind turbine based on CFD simulations coupled with the Actuator Line Model (ALM). This design is compared with
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Imraan, Mustahib, Rajnish N. Sharma, and Richard G. J. Flay. "Telescopic Wind Turbines to Capture Energy at Low Wind Speeds." In ASME 2009 3rd International Conference on Energy Sustainability collocated with the Heat Transfer and InterPACK09 Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/es2009-90118.

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The reduction in cost of energy of wind turbines requires many technical contributions from all areas of the Wind Energy Conversion System. The variations in the wind (e.g. Diurnal, Monthly, Seasonal and Long term) as normally shown on probability density distributions directly affect the wind turbine performance. The turbine power output is also dependent upon a number of other variables, and a lot of research has been carried out to increase the power coefficient that has an upper limit of 0.593 called the Betz Limit. A possible way for improving the power output of a turbine is to control t
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Newbauer, Sam, and Subha Kumpaty. "Computational Fluid Dynamics of Aerodynamic Effects for Optimum Number of Wind Turbine Blades." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-85557.

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Generally, wind turbines have been constructed with three blades. Early analysis showed that as the number of blades increases, the power of extraction of wind turbines approaches the Betz limit. The increase in power extraction lessens as the blade number increases (greater increase from one to two blades than from two to three blades). The analysis assumed an ideal blade (zero drag) and no interaction between the blades. This paper investigates those two effects using CFD. Analysis of a 2D airfoil (S809) was compared to a finite 3D model. The 3D losses were then determined from those results
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Oka, Nobuhito, Masato Furukawa, Kazutoyo Yamada, Akihiro Oka, and Yasushi Kurokawa. "Aerodynamic Performances and Flow Fields of Pareto Optimal Solutions in an Aerodynamic Design of a Wind-Lens Turbine." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43619.

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The new type of shrouded wind turbine called “wind-lens turbine” has been developed. The wind-lens turbine has a brimmed diffuser called “wind-lens”, by which the wind concentration on the turbine blade and the significant enhancement of the turbine output can be achieved. A simultaneous optimization method for the aerodynamic design of rotor blade and wind-lens has been developed. The present optimal design method is based on a genetic algorithm (GA) which enables multi objective aerodynamic optimization. In the present study, aerodynamic performances and flow fields of the Pareto optimal sol
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Foote, Tudor, and Ramesh Agarwal. "Power Generation From Wind Turbines in a Solar Chimney." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54085.

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In past several years, several studies have shown that the shrouded wind turbines can generate greater power compared to bare turbines. A solar chimney not only generates an upward draft of the wind inside the solar tower but also creates a shroud around the wind turbine. There is large number of empty silos on farms, especially in mid-western U.S. They can be used as a solar chimney with minor modifications at very modest cost. The objective of this study is to determine the potential of these silos/chimneys in generating wind-power by installing a wind turbine inside the silo. An analytical/
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Garate, Juan, Stephen A. Solovitz, and Dave Kim. "A Preliminary Study on Small Thermoplastic Composite Wind Turbine Blade Design and Fabrication." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51745.

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Today a large-scale wind turbine blade can be 70 m long and 5 m in root chord length, and it is fabricated in a single piece. This feature leads to high initial costs, as transportation of a large blade requires special trucks, escorts, and road adaptations. These constraints can account for approximately 6–7% of the total investment for the blade. In addition, the manufacturing process commonly used is a hand lay-up configuration of thermoset composite sheets. These materials are not reusable after fabrication, which is a non-renewable feature of existing systems. The project consists of manu
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Krippene, Brett C., Gerald C. Chen, Kenneth L. Starcher, Joseph A. Urich, Ralph W. McConnell, and Robert P. Jenks. "WINDGRABBER™: A Novel Approach to Small Wind Turbine Design and Operation for Use on or Above the Rooftops of Homes and Small Office Buildings." In ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49009.

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WINDGRABBER™ (WG) is a novel new roof or pole top mounted wind turbine system proposed for product commercialization up to 50 kWe. WG is projected to be cost-attractive in an environmentally friendly manner. The WG system uses the available energy in the wind via (1) a passively yawed air impact inlet air scoop, (2) a flow tube, (3) an air turbine and (4) a multiphased air inlet with an air impact - drag type outlet section. The WG wind turbine system preferentially utilizes a combination enclosed - radial out-flow, cross-flow, reaction-impulse air turbine of squirrel cage configuration, using
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