Results 191 to 200 of about 13,230 (227)

Meteorological Controls on Wind Turbine Wakes

Proceedings of the IEEE, 2013
The primary control on the magnitude of the power losses induced by wind turbine wakes in large wind farms is the hub-height wind speed via its link to the turbine thrust coefficient. Hence, at low to moderate wind speeds (between cut-in and rated turbine wind speeds) when the thrust coefficient is high, wake losses are proportionally larger and ...
Rebecca J. Barthelmie, Kurt S. Hansen, Sara C. Pryor   +2 more
openaire   +1 more source

A Hybrid Free Wake Simulation Comparison of Turbine Wake Steering With Innovative Turbine Designs

Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2017
Wake shielding in wind farms caused by the interaction of upstream energy-depleted wakes and down-stream turbines substantially reduces individual turbine efficiency and overall wind farm performance. A method is studied to alleviate this problem using shaft tilting to steer wakes upward and reduce the interaction with downstream turbines.
Keye Su, Donald B. Bliss
openaire   +1 more source

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

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 ...
openaire   +2 more sources

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   +1 more source

Wind Turbine Near Wakes and Comparisons to the Wake Behind a Disc

43rd AIAA Aerospace Sciences Meeting and Exhibit, 2005
The wake development behind wind turbines affects power losses in turbine parks aswell as the flow induced rotor loads due to wake turbulence.
Davide Medici, Henrik Alfredsson
openaire   +1 more source

Three-dimensional free wake calculation of wind turbine wakes

Journal of Wind Engineering and Industrial Aerodynamics, 1988
Abstract A numerical method has been developed for the computation of wake structure and development of horizontal axis wind turbines. The method uses the vortex particle concept which already has been used in order to compute three-dimensional unsteady inviscid flows around wings and helicopter rotors.
A. Zervos, S. Huberson, A. Hemon
openaire   +1 more source

Unsteady Turbine Blade Wake Characteristics

Volume 6: Turbo Expo 2003, Parts A and B, 2003
The paper presents an experimental investigation of large coherent structures, commonly referred to as “von Karman vortex street”, in the wake of a turbine blade at high subsonic Mach number (M2,is = 0.79) and high Reynolds number (RE = 2.8×106 and their effect on the steady and unsteady pressure and temperature distribution in the wake.
Claus H. Sieverding, Davide Ottolia, Carlo Bagnera, Andrea Cimadoro, Jean-Michel Desse   +4 more
openaire   +1 more source

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
openaire   +1 more source