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Relevant bibliographies by topics / Chord and twist distributions

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Academic literature on the topic 'Chord and twist distributions'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Chord and twist distributions"

1

Tahani, Mojtaba, Ghazale Kavari, Mojtaba Mirhosseini, and Samira Ghiyasi. "Different functionalized chord and twist distributions in aerodynamic design of HAWTs." Environmental Progress & Sustainable Energy 38, no. 4 (2019): 13108. http://dx.doi.org/10.1002/ep.13108.

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Giovanetti, EliB, and KennethC Hall. "Minimum Loss Load, Twist, and Chord Distributions for Coaxial Helicopters in Hover." Journal of the American Helicopter Society 62, no. 1 (2017): 1–9. http://dx.doi.org/10.4050/jahs.62.012001.

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Tahani, Mojtaba, Ghazale Kavari, Mehran Masdari, and Mojtaba Mirhosseini. "Aerodynamic design of horizontal axis wind turbine with innovative local linearization of chord and twist distributions." Energy 131 (July 2017): 78–91. http://dx.doi.org/10.1016/j.energy.2017.05.033.

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Yang, Kyoungboo. "Geometry Design Optimization of a Wind Turbine Blade Considering Effects on Aerodynamic Performance by Linearization." Energies 13, no. 9 (2020): 2320. http://dx.doi.org/10.3390/en13092320.

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For a wind turbine to extract as much energy as possible from the wind, blade geometry optimization to maximize the aerodynamic performance is important. Blade design optimization includes linearizing the blade chord and twist distribution for practical manufacturing. As blade linearization changes the blade geometry, it also affects the aerodynamic performance and load characteristics of the wind turbine rotor. Therefore, it is necessary to understand the effects of the design parameters used in linearization. In this study, the effects of these parameters on the aerodynamic performance of a

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Tan, Chung Ming, and Mei Juan Lai. "Small Wind Turbine Design Verification by Computer Simulation." Applied Mechanics and Materials 863 (February 2017): 235–40. http://dx.doi.org/10.4028/www.scientific.net/amm.863.235.

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Rotor blade design relies heavily on the aerodynamic theory. Extensive calculations are necessary in order to determine the blade parameters such as chord and thickness distributions, twist angle distribution and taper that is matched with the selected airfoil sections. For practical purposes, the engineers need a convenient means to verify their design. Wind turbine blades must be designed to operate in desirable performance. This research proposes a computer aided method that helps the engineers to examine the design and amend it in time. The numerical example shows good applicability of the

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6

Tangler, J. L. "Influence of Pitch, Twist, and Taper on a Blade’s Performance Loss due to Roughness." Journal of Solar Energy Engineering 119, no. 3 (1997): 248–52. http://dx.doi.org/10.1115/1.2888027.

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The purpose of this study was to determine the influence of blade geometric parameters such as pitch, twist, and taper on a blade’s sensitivity to leading edge roughness. The approach began with an evaluation of available test data of performance degradation due to roughness effects for several rotors. In addition to airfoil geometry, this evaluation suggested that a rotor’s sensitivity to roughness was also influenced by the blade geometric parameters. Parametric studies were conducted using the PROP93 computer code with wind tunnel airfoil characteristics for smooth and rough surface conditi

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Galetuse, S. "On the Highest Efficiency Windmill Design." Journal of Solar Energy Engineering 108, no. 1 (1986): 41–48. http://dx.doi.org/10.1115/1.3268062.

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A discussion concerning the effect of profile drag on induced velocities is presented. It is concluded that Glauert’s relations for the ideal windmill are also valid for a real windmill. Using these results, the optimum conditions for induced efficiency and power coefficient are obtained. The chord distribution and the twist of the blade are then given as a function of constant K2 for highest power coefficient.

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Debbache, Mohammed, Messaoud Hazmoune, Semcheddine Derfouf, Dana-Alexandra Ciupageanu, and Gheorghe Lazaroiu. "Wind Blade Twist Correction for Enhanced Annual Energy Production of Wind Turbines." Sustainability 13, no. 12 (2021): 6931. http://dx.doi.org/10.3390/su13126931.

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Blade geometry is an important design parameter that influences global wind turbine energy harvesting performances. The geometric characteristics of the blade profile are obtained by determining the distribution of the chord and twist angle for each blade section. In order to maximize the wind energy production, implying a maximum lift-to-drag ratio for each wind speed, this distribution should be optimized. This paper presents a methodology to numerically determine the change in the twist angle by introducing a range of pitch angles for the maximum power coefficient case. The obtained pitch v

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Purusothaman, M., T. N. Valarmathi, and S. Praneeth Reddy. "Selection of Twist and Chord Distribution of Horizontal Axis Wind Turbine in Low Wind Conditions." IOP Conference Series: Materials Science and Engineering 149 (September 2016): 012203. http://dx.doi.org/10.1088/1757-899x/149/1/012203.

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Xu, Jianhua, Zhonghua Han, Xiaochao Yan, and Wenping Song. "Design Optimization of a Multi-Megawatt Wind Turbine Blade with the NPU-MWA Airfoil Family." Energies 12, no. 17 (2019): 3330. http://dx.doi.org/10.3390/en12173330.

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A new airfoil family, called NPU-MWA (Northwestern Polytechnical University Multi-megawatt Wind-turbine A-series) airfoils, was designed to improve both aerodynamic and structural performance, with the outboard airfoils being designed at high design lift coefficient and high Reynolds number, and the inboard airfoils being designed as flat-back airfoils. This article aims to design a multi-megawatt wind turbine blade in order to demonstrate the advantages of the NPU-MWA airfoils in improving wind energy capturing and structural weight reduction. The distributions of chord length and twist angle

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Dissertations / Theses on the topic "Chord and twist distributions"

1

Khamlaj, Tariq A. "Analysis and Optimization of Shrouded Horizontal Axis Wind Turbines." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1543845571758119.

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Maússe, Celestino Fernando. "Use of artificial neural network models to derive particle size distributions and their moments from chord length distributions." Master's thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/5296.

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Includes bibliographical references (leaves 121-123).<br>The objective of this study was to develop a method for in-lie measurement of a particle size distribution (PSD) of suspended solids and its moments. This was part of a wider study, the aim of which was to develop a system for controlling a crystallisation process. The control strategy to be used is dependent on kinetic models of the process. These are in turn dependent on the zeroth to fifth moments of the particle size distribution and the supersaturation levels of the solution. In order to apply advanced control to a process, continuo

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Desenfans, Philip. "Aerodynamics of the Maple Seed." Aircraft Design and Systems Group (AERO), Department of Automotive and Aeronautical Engineering, Hamburg University of Applied Sciences, 2019. http://d-nb.info/1204982848.

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Purpose - The paper presents a theoretical framework that describes the aerodynamics of a falling maple (Acer pseudoplatanus) seed. --- Methodology - A semi-empirical method is developed that provides a ratio stating how much longer a seed falls in air compared to freefall. The generated lift is calculated by evaluating the integral of two-dimensional airfoil elements using a preliminary falling speed. This allows for the calculation of the definitive falling speed using Blade Element Momentum Theory (BEMT); hereafter, the fall duration in air and in freefall are obtained. Furthermore, the inp

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Lin, Fang-Jin, and 林昉瑾. "The Coupling Design and Analysis of Chord Length and Twist angle of Helicopter Rotor Blade in Unsteady Wake Dynamic System." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/72078042661563400276.

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碩士<br>淡江大學<br>航空太空工程學系<br>87<br>Optimum design of two different design variables, chord length and twist angle, through an unsteady aerodynamic system will be considered in this study. Besides, this paper also discuss the coupling effect between chord length and twist angle, and apply wake dynamics, areodynamics and optimality criterion theory to obtain the optimum configuration of rotor blades. The purpose of this study is to obtain a helicopter blades' chord length and twist angle which to minimize the power output and also maintain the lift force in a misson. Because design variable doub

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"Compton Scattering and Renormalization of Twist Four Operators." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.38359.

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abstract: In this thesis, I present the study of nucleon structure from distinct perspectives. I start by elaborating the motivations behind the endeavors and then introducing the key concept, namely the generalized parton distribution functions (GPDs), which serves as the frame- work describing hadronic particles in terms of their fundamental constituents. The second chapter is then devoted to a detailed phenomenological study of the Virtual Compton Scattering (VCS) process, where a more comprehensive parametrization is suggested. In the third chapter, the renormalization kernels that enters

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Books on the topic "Chord and twist distributions"

1

Center, Ames Research, ed. Spanwise lift distributions and wake velocity surveys of a semi-span wing with a discontinuous twist. National Aeronautics and Space Administration, Ames Research Center, 1989.

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Cooperative agreement #NCC 2-175 entitled Investigation of a free-tip rotor configuration for research on spanwise life [i.e. lift] distributions and wake velocity surveys of a semi-span wing with a discontinuous twist: Final report. University of Kansas Center for Research, Inc., 1989.

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Book chapters on the topic "Chord and twist distributions"

1

Pantleon, Wolfgang. "Unbiased Evaluation of Chord Length Distributions from Orientation Maps." In Materials Science Forum. Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-975-x.219.

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Ismail, Kamal A. R., and Célia V. A. G. Rosolen. "Parametric Study of the Effects of Varying the Airfoil Section, the Chord and Pitch Distributions Along the Propeller Blade." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99270-9_12.

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3

"It is theoretically possible to look for twist-three cur-." In Noncommutative Distributions. CRC Press, 1993. http://dx.doi.org/10.1201/9781482277579-46.

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4

"Chord length distributions of infinitely long cylinders." In Particle and Particle Systems Characterization. CRC Press, 2016. http://dx.doi.org/10.1201/b16057-5.

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Conference papers on the topic "Chord and twist distributions"

1

Vick, B. D., W. Wrigglesworth, L. B. Scott, and K. M. Ragsdell. "Optimal Design of Wind Turbines Using BIAS, A Method of Multipliers Code." In ASME 1988 Design Technology Conferences. American Society of Mechanical Engineers, 1988. http://dx.doi.org/10.1115/detc1988-0026.

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Abstract A method has been developed and is demonstrated which determines the chord and twist distribution for a wind turbine with maximum power coefficient. Only small wind turbines (less than 10 kilowatts) are considered in this study, but the method could be used for larger wind turbines. Glauert determined a method for estimating the chord and twist distribution that will maximize the power coefficient if there is no drag. However, the method proposed here determines the chord and twist distribution which will maximize the power coefficient with the effect of drag included. Including drag

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2

Satwika, Nyoman Ade, Sarwono, and Ridho Hantoro. "Investigation Flow on Horizontal Axis Wind Turbine with Betz Chord Distribution, Twist, and Winglet." In 2018 4th International Conference on Science and Technology (ICST). IEEE, 2018. http://dx.doi.org/10.1109/icstc.2018.8528653.

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Uzarraga-Rodriguez, N. C., A. Gallegos-Muñoz, Maria T. Parra-Santos, and Juan M. Belman-Flores. "Numerical Analysis of Airfoils Used for Vertical Axis Wind Turbine." In ASME 2012 6th International Conference on Energy Sustainability collocated with the ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/es2012-91113.

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A numerical analysis of a three-bladed straight vertical axis wind turbine with NACA0015 airfoils-shaped is presented. The effect generated on the moment coefficient and power coefficient of the wind turbine rotor by the twist angle variation at the chord ends was analyzed. The configurations included the variation of blade twist angle of 15° and 30° located at 70%, 80% and 90% of chord length from leading end of the straight blade. The numerical study was developed in a commercial Computational Fluid Dynamics (CFD) using FLUENT®. This code allows to solve the Reynolds averaged Navier-Stokes e

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Kulunk, Emrah, and Nadir Yilmaz. "Aerodynamic Design and Performance Analysis of HAWT Blades." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78561.

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In this paper, a design method based on blade element momentum (BEM) theory is explained for horizontal-axis wind turbine (HAWT) blades. The method is used to optimize the chord and twist distributions of the blades. Applying this method a 100kW HAWT rotor is designed. Also a computer program is written to estimate the aerodynamic performance of the existing HAWT blades and used for the performance analysis of the designed 100kW HAWT rotor.

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Kulunk, Emrah, and Nadir Yilmaz. "HAWT Rotor Design and Performance Analysis." 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/es2009-90441.

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In this paper, a design method based on blade element momentum (BEM) theory is explained for horizontal-axis wind turbine (HAWT) blades. The method is used to optimize the chord and twist distributions of the blades. Applying this method a 100kW HAWT rotor is designed. Also a computer program is written to estimate the aerodynamic performance of the existing HAWT blades and used for the performance analysis of the designed 100kW HAWT rotor.

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6

Bir, Gunjit S., Michael J. Lawson, and Ye Li. "Structural Design of a Horizontal-Axis Tidal Current Turbine Composite Blade." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50063.

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This paper describes the structural design of a tidal turbine composite blade. The structural design is preceded by two steps: hydrodynamic design and determination of extreme loads. The hydrodynamic design provides the chord and twist distributions along the blade length that result in optimal performance of the tidal turbine over its lifetime. The extreme loads, i.e. the extreme flap and edgewise loads that the blade would likely encounter over its lifetime, are associated with extreme tidal flow conditions and are obtained using a computational fluid dynamics (CFD) software. Given the blade

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Caboni, Marco, M. Sergio Campobasso, and Edmondo Minisci. "Wind Turbine Design Optimization Under Environmental Uncertainty." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42674.

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Wind turbine design optimization is typically performed considering a given wind distribution. However, turbines so designed often end up being used at sites characterized by different wind distributions, and this results in significant performance penalties. This paper presents a probabilistic integrated multidisciplinary approach to the design optimization of multi-megawatt wind turbines accounting for the stochastic variability of the mean wind speed. The presented technology is applied to the design of a 5 MW rotor to be used at sites of wind power class from 3 to 7, where the mean wind sp

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Bayoumy, Ahmed H., Ayman A. Nada, and Said M. Megahed. "Use of Forward Dynamics Model for Designing Large-Size Wind Turbine Blades." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64309.

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In this paper, the Blade Element Momentum (BEM) theory is used to design the horizontal wind turbine blades. The design procedure concerns the main parameters of the axial/angular induction factors, chord length, twist/attack angles, and local power/thrust coefficients. These factors in turns affect the blade aerodynamics characteristics and efficiency at the corresponding nominal speed. NACA 4-digits airfoil geometry is obtained, using BEM theory, to achieve the maximum lift to drag ratios. The optimization of the power coefficient and its distribution versus different speeds is carried out b

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Rea, Francesco, Francesco Amoroso, Rosario Pecora, and Markus Kintscher. "Design of an Adaptive Twist Trailing Edge for Large Commercial Aircraft Applications." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-7939.

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Researchers and engineers design modern aircraft wings to reach high levels of efficiency with the main outcome of weight saving and airplane lift-to-drag ratio increasing. Future commercial aircraft need to be mission-adaptive to improve their operational efficiency. Twistable trailing edge could be used to improve aircraft performances during climb and off-design cruise conditions in response to variations in speed, altitude, air temperature, and other flight parameters. Indeed, “continuous” span-wise twist of the wing trailing edge could provide significant reduction of the wing root bendin

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Izadi, Mohammad J., and Mahdi Mirtorabi. "Numerical Study of Twist Effect of a Hydrofoil on the Length of Cavity and Lift and Drag Coefficients in Different Reynolds Numbers." In ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78293.

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In this study a cavitating flow around a three dimensional twisted hydrofoil in an incompressible fluid is modeled. The variables in this study are; the twist angle, the angle of attack and the Reynolds number. The twist angle changes from 0.0 to 5.0 degrees with respect to the root, the angles of attack changes from −2 to 12 degrees and all these are computed at two Reynolds numbers of 5.791·107, and 1.99·108. The flow is assumed to be unsteady and isothermal. Coefficients of the drag and lift and also the cavity length are computed numerically. Numerical simulations are carried out and the c

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Reports on the topic "Chord and twist distributions"

1

Chang, B. Chord Distributions of a Spherical Shell. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/15014365.

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Prinja, A., and C. Skinner. Transport in Stochastic Media with Random Chord Length Distributions. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1820548.

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