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W
webthesis.biblio.polito.it
article
https://webthesis.biblio.polito.it/22148/1/tesi.pdf
* This work is presented in partial fulfillment of the requirements for MSc degree in the Politecnico di Torino iv Abstract Offshore wind power is becoming a profitable way to produce vast quantities of electrical power because of the high availability of the resource and progressive decrease of the design and installation costs. One of them is vertical axis wind turbines, because of their lower centre of gravity and upscaling properties. The aim of this thesis is to model and simulate a vertical axis wind turbine system in onshore conditions, to determine its behaviour for a future integration on a floating system. To do that, initially a short review about vertical axis turbines technology was done, together with a comparison of aerodynamic models. Many turbines were tested on this model, and then 2 of them were chosen to be studied more deeply. To do a proper dynamical simulation, also a control system on 2 variables (torque and pitch) was implemented to improve both performance and safety of the system.
V
verso.uidaho.edu
research
https://verso.uidaho.edu/view/pdfCoverPage?instCode=01ALLIANCE_UID&filePid=13…
Simulations of the National Renewable Energy Laboratory (NREL) phase VI wind turbine using dynamic overset grid technology are presented.
M
mdpi.com
article
https://www.mdpi.com/2674-032X/5/1/6
A Statistical–Dynamical Downscaling Technique for Wind Resource Mapping: A Regional Atmospheric-Circulation-Type Approach with Numerical Weather Prediction Modeling. No special permission is required to reuse all or part of the article published by MDPI, including figures and tables. For articles published under an open access Creative Common CC BY license, any part of the article may be reused without permission provided that the original article is clearly cited. Editor’s Choice articles are based on recommendations by the scientific editors of MDPI journals from around the world. Editors select a small number of articles recently published in the journal that they believe will be particularly interesting to readers, or important in the respective research area. The aim is to provide a snapshot of some of the most exciting work published in the various research areas of the journal. This study investigates the integration and assessment of the Actuator Line Model (ALM) within the high-order spectral/hp element framework, Nektar++, for wind turbine aerodynamic simulations.
O
open.metu.edu.tr
research
https://open.metu.edu.tr/handle/11511/24943
This thesis presents an aerodynamic shape optimization methodology for rotor blades of horizontal axis wind turbines. Genetic Algorithm and Blade Element
D
diva-portal.org
article
https://www.diva-portal.org/smash/get/diva2:7492/FULLTEXT02.pdf
82 viii Paper 1: Aeroelastic FE modelling of wind turbine dynamics 89 Paper 2: Emergency stop simulation using a FEM model developed for large blade deflections 115 Paper 3: Influence of wind turbine flexibility on loads and power production 141 ix List of symbols a′ tangential induction factor, 23 α angle of attack, 23 c blade cord length, 22 CD drag coefficient, 22 CL lift coefficient, 22 CN projected drag coefficient, 23 c(r) chord at position r, 24 CT projected lift coefficient, 23 D drag force, 23 FN force normal to rotor plane, 23 FT force tangential to rotor plane, 23 L lift force, 22 N number of blades, 24 ω rotation speed, 23 φ angle between disc plane and relative velocity, 23 r radius of the blade, 23 σ solidify factor, 24 θ local pitch of the blade, 23 U∞ undisturbed air speed, 23 Vrel relative air speed, 22 xi List of Figures 2.1 The 1.250 MW Smith-Putnam wind turbine.
A
asmedigitalcollection.asme.org
article
https://asmedigitalcollection.asme.org/appliedmechanics/article/81/2/021011/3…
Full-scale, 3D, time-dependent aerodynamics modeling and simulation of a Darrieus-type vertical-axis wind turbine (VAWT) is presented.
Y
youtube.com
video
https://www.youtube.com/watch?v=HZdds40Ry5E
Aerodynamic Evaluation of Wind Turbines: BEM vs. FVW vs. CFD
Applied Computational Fluid Dynamics
7000 subscribers
131 likes
3961 views
14 Aug 2023
This video presents the three commonly used methods for the evaluation of wind turbine aerodynamics including
00:02:19 Blade element momentum (BEM)
00:43:38 Free vortex wake (FVW)
00:50:57 Computational fluid dynamics (CFD)
Traditionally, it is common to use the BEM theory to assess the aerodynamic behavior of a wind turbine. However, over the recent years, the size of wind turbines, especially the offshore ones, has undergone a dramatic increase due to substantial economic benefits. The large blades of these huge machines are subject to large deformations due to increased flexibility and non-straight pre-bended blades. This, as a result, complicates highly the aerodynamics of wind turbines, where the low-fidelity BEM method is unable to predict accurately the machine behavior. This calls for aerodynamic models capable of capturing accurately the machine aerodynamics under large deformations of blades. Therefore, this has led to the development of FVW and CFD methods, which are capable of modeling more accurately the complex physics related to aerodynamics of large-scale wind turbines.
9 comments
I
iea-wind.org
article
https://iea-wind.org/wp-content/uploads/2023/10/84_Aerodynamics-of-Wind-Turbi…
Madsen, C.F. Andersen 25-11-2016 *) European Energy Research Alliance FP7-ENERGY-2013-1/ n° 608396 4 Period • Project period: November 1st 2013- November 1st 2017 IEA WIND ENERGY - Task 11: Base Technology Information Exchange TEM 84 – Aerodynamics Pag. 102 FP7-ENERGY-2013-1/ n° 608396 5 Main motivation for AVATAR: Aerodynamics of large wind turbines (10-20MW) UPSCALING towards 10-20 MW turbines is expected to lead to turbines with: Low induction Long slender blades Thick airfoils High tip speeds Passive (e.g. vortex generators (vg’s)) and active flow devices (e.g. flaps) 25-11-2016 FP7-ENERGY-2013-1/ n° 608396 6 Motivation, ctd • We simply don’t know if present aerodynamic models are good enough to design 10MW+ turbines – “No mature industry will ever design a MEuro machine with unvalidated tools” • 10MW+ rotors violate assumptions in current aerodynamic tools, e.g.: – Reynolds number effects, – Compressibility effects – Flow transition and separation, – (More) flexible blades – Flow devices • Hence 10MW+ designs fall outside the validated range of current state of the art tools.