Results 191 to 200 of about 2,147 (222)

A new analytical model for wind-turbine wakes [PDF]

Renewable Energy, 2014
A new analytical wake model is proposed and validated to predict the wind velocity distribution downwind of a wind turbine. The model is derived by applying conservation of mass and momentum and assuming a Gaussian distribution for the velocity deficit ...
Majid Bastankhah, Fernando Porté-Agel, Corey D Markfort   +2 more
exaly   +2 more sources

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Visualization of the tip vortices in a wind turbine wake

Journal of Visualization, 2011
In the present study, an experimental study was conducted to characterize the formation and the evolution of the helical tip vortices and turbulent flow structures in the wake of a horizontal axis wind turbine model placed in an atmospheric boundary layer wind.
Zifeng Yang, Partha Sarkar, Hui Hu
openaire   +2 more sources

Wind turbine wake aerodynamics

Progress in Aerospace Sciences, 2003
Abstract The aerodynamics of horizontal axis wind turbine wakes is studied. The contents is directed towards the physics of power extraction by wind turbines and reviews both the near and the far wake region. For the near wake, the survey is restricted to uniform, steady and parallel flow conditions, thereby excluding wind shear, wind speed and rotor
L.J. Vermeer, J.N. Sørensen, A. Crespo
openaire   +1 more source

Wind Tunnel Investigation on Wake Effects of a Wind Turbine

2009
The flow field in the wake of a an horizontal axis wind turbine was studied through wind tunnel tests at the Mechanical Department of the Politecnico di Milano. Aim of the research is to measure the wind flow in different points in the wake in order to characterize the flow blowing on structures that are positioned downwind a wind turbine and ...
DIANA, GIORGIO, ROCCHI, DANIELE, GIAPPINO, STEFANO GIUSEPPE   +2 more
openaire   +2 more sources

Met Mast Measurements of Wind Turbine Wakes

2021
This chapter addresses met mast measurements for wind turbine wake research, where we tackle the matter by posing and answering three questions. By asking ourselves what the value is of met mast measurements for wake/aerodynamic research, we describe how met masts can be and have been used in aerodynamic research, accompanied by a number of ...
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Turbulent Wind Turbine Wakes in a Wind Farm

2012
A model of flow in a cluster of wind turbines has been developed. The model predicts average and standard deviation of wind speed in a wind farm as function of ambient wind speed, wind direction and turbulence intensity. In this paper the sub-models for velocity deficit and added turbulence of a single wind turbine are presented.
Arno J. Brand, Jan Willem Wagenaar
openaire   +1 more source

Anisotropy of turbulence in wind turbine wakes

Journal of Wind Engineering and Industrial Aerodynamics, 2005
This work is mainly dedicated to the study of non-isotropic characteristics of turbulence in wind turbine wakes, specifically the shear layer of the near wake. A calculation method based on an explicit algebraic model for the components of the turbulent stress tensor is proposed, and the results are found to be in acceptable agreement with experimental
Rafael Gómez-Elvira, Antonio Crespo, Emilio Migoya, Fernando Manuel, Julio Hernández   +4 more
openaire   +1 more source

Wind turbine wakes over hills

Journal of Fluid Mechanics, 2018
Understanding and predicting the behaviour of wind turbine wake flows over hills is important for optimal design of wind-farm configurations on topography. In this study, we present an analytical modelling framework together with large-eddy simulation (LES) results to investigate turbine wakes over two-dimensional hills.
Sina Shamsoddin, Fernando Porté-Agel
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Numerical Modeling of Wind Turbine Wakes

Journal of Fluids Engineering, 2002
An aerodynamical model for studying three-dimensional flow fields about wind turbine rotors is presented. The developed algorithm combines a three-dimensional Navier-Stokes solver with a so-called actuator line technique in which the loading is distributed along lines representing the blade forces.
Jens No̸rkær So̸rensen, Wen Zhong Shen   +1 more
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Turbulence characteristics in wind-turbine wakes

Journal of Wind Engineering and Industrial Aerodynamics, 1996
Abstract An analysis of the evolution of turbulence characteristics in wind-turbine wakes has been carried out. Based on experimental results and on numerical results obtained with a CFD code, complemented with some theoretical considerations, simple analytical expressions are proposed for the estimation of the turbulent kinetic energy, k, and its ...
A. Crespo, J. Herna´ndez
openaire   +1 more source