Results 111 to 120 of about 31,364 (231)

Wake Characteristics of Large-scale Wind Turbines [PDF]

The next generation of large-scale wind turbines will exceed 10 MW of rated power and will reach rotor diameters of about 200 m. Their rotor aerodynamics are also extreme with Reynolds numbers that reach 40 million.

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The influence of blade curvature and helical blade twist on the performance of a vertical-axis wind turbine [PDF]

, 2010
Accurate aerodynamic modeling of vertical-axis wind turbines poses a significant challenge, but is essential if the performance of such turbines is to be predicted reliably.
Brown, R.E., Fletcher, Timothy M., Scheurich, Frank   +2 more
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Determination of Wind Turbine Near-Wake Length Based on Stability Analysis [PDF]

, 2014
A numerical study on the wake behind a wind turbine is carried outfocusing on determining the length of the near-wake based on the instability onset ofthe trailing tip vortices shed from the turbine blades.
Alfredsson, Dan Henningson, Jens N Sørensen, Lamb, Leweke, Michelsen, Mikkelsen, Okulov, Robert Mikkelsen, Sasan Sarmast, Stefan Ivanell, Sørensen, Sørensen, Troldborg   +13 more
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Theoretical Modeling of Vertical-Axis Wind Turbine Wakes [PDF]

Energies, 2018
In this work, two different theoretical models for predicting the wind velocity downwind of an H-rotor vertical-axis wind turbine are presented. The first model uses mass conservation together with the momentum theory and assumes a top-hat distribution for the wind velocity deficit.
openaire   +2 more sources

Numerical simulations of wind turbine wakes

, 2018
In recent years, the size and capacity of wind farms have increased significantly, as larger turbines are being clustered together to take advantage of the available wind resource. In large-scale wind farms, the downstream wind turbines will inevitably operate within the wake of the upstream ones. This leads to an apparent reduction of the power output
openaire   +3 more sources

Maximizing wind farm power output with the helix approach: Experimental validation and wake analysis using tomographic particle image velocimetry

Wind Energy
Wind farm control can play a key role in reducing the negative impact of wakes on wind turbine power production. The helix approach is a recent innovation in the field of wind farm control, which employs individual blade pitch control to induce a helical
Daan van derHoek, Bert Van denAbbeele, Carlos Simao Ferreira, Jan‐Willem vanWingerden   +3 more
doaj   +1 more source

Analysis of turbulence and vortex structures by flow mapping [PDF]

, 1997
The technique of Particle Image Velocimetry (PIV) flow mapping is reviewed and comparisons made with Laser Doppler Anemometry (LDA). Results are presented showing the application of PlV to the determination of coherent structures in grid-generated ...
Damm, C.E., Greated, C.A., Whale, J.
core   +1 more source

Optimal Irregular Wind Farm Design for Continuous Placement of Wind Turbines with a Two-Dimensional Jensen-Gaussian Wake Model

Applied Sciences, 2018
Optimal design of wind turbine placement in a wind farm is one of the most effective tools to reduce wake power losses by alleviating the wake effect in the wind farm.
Longyan Wang, Yunkai Zhou, Jian Xu
doaj   +1 more source

Neighborhood effects in wind farm performance: An econometric approach

, 2016
The optimization of turbine density in wind farms entails a trade-off between the usage of scarce, expensive land and power losses through turbine wake effects.
Odening, Martin, Pieralli, Simone, Ritter, Matthias   +2 more
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Wind-Turbine Wakes in a Convective Boundary Layer: A Wind-Tunnel Study [PDF]

, 2018
Thermal stability changes the properties of the turbulent atmospheric boundary layer, and in turn affects the behaviour of wind-turbine wakes. To better understand the effects of thermal stability on the wind-turbine wake structure, wind-tunnel ...
Markfort, Corey, Porté-Agel, Fernando, Zhang, Wei   +2 more
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