Journal ArticleDOI
A simple model of the wind turbine induction zone derived from numerical simulations
TLDR
In this article, the authors studied the induction zone in front of different wind turbine rotors by means of steady-state Navier-Stokes simulations combined with an actuator disk approach.Abstract:
The induction zone in front of different wind turbine rotors is studied by means of steady-state Navier-Stokes simulations combined with an actuator disk approach. It is shown that, for distances beyond 1 rotor radius upstream of the rotors, the induced velocity is self-similar and independent of the rotor geometry. On the basis of these findings, a simple analytical model of the induction zone of wind turbines is proposed.read more
Citations
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Journal ArticleDOI
Power curve and wake analyses of the Vestas multi-rotor demonstrator
Maarten Paul van der Laan,Søren Juhl Andersen,Néstor Ramos García,Nikolas Angelou,Georg Pirrung,Søren Ott,Mikael Sjöholm,Kim Hylling Sørensen,Julio Xavier Vianna Neto,Mark C. Kelly,Torben Mikkelsen,Gunner Christian Larsen +11 more
TL;DR: In this article, the wake recovery distance of a simplified 4R-V29 wind turbine is shown to be 1.03-1.44 seconds shorter than an equivalent single-rotor wind turbine with a rotor diameter of 2.5 seconds.
Journal ArticleDOI
Wind field reconstruction from nacelle-mounted lidar short-range measurements
TL;DR: In this paper, a model-fitting wind field reconstruction technique is applied to nacelle lidar measurements taken at multiple distances close to the rotor, where a wind model is combined with a simple induction model.
Journal ArticleDOI
Assessing the blockage effect of wind turbines and wind farms using an analytical vortex model
Journal ArticleDOI
Optimizing wind farm control through wake steering using surrogate models based on high-fidelity simulations
TL;DR: The optimization performed using two Vestas V27 turbines in a row for a specific atmospheric condition suggests that a power gain can be achieved at close spacing by yawing the upstream turbine more than 15∘ , but at larger spacing the optimization shows that yawed is not beneficial as the optimization reverts to normal operation.
Journal ArticleDOI
How does turbulence change approaching a rotor
TL;DR: In this paper, a forward-looking pulsed lidar was used to measure low-frequency wind fluctuations simultaneously at distances between 0.5 and 3.5 rotor diameters upstream.
References
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Journal ArticleDOI
A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows
S.V. Patankar,D. B. Spalding +1 more
TL;DR: In this article, a general, numerical, marching procedure is presented for the calculation of the transport processes in three-dimensional flows characterised by the presence of one coordinate in which physical influences are exerted in only one direction.
ReportDOI
Definition of a 5-MW Reference Wind Turbine for Offshore System Development
TL;DR: In this article, a three-bladed, upwind, variable speed, variable blade-pitch-to-feather-controlled multimegawatt wind turbine model developed by NREL to support concept studies aimed at assessing offshore wind technology is described.
Journal ArticleDOI
A stable and accurate convective modelling procedure based on quadratic upstream interpolation
TL;DR: In this paper, a convective modeling procedure is presented which avoids the stability problems of central differencing while remaining free of the inaccuracies of numerical diffusion associated with upstream differencings.
General purpose flow solver applied to flow over hills
TL;DR: This document breaches copyright and should be removed from access immediately, and the authors will remove access to the work immediately and investigate the claim.