Wake effect on a uniform flow behind wind-turbine model

LDA experiments were carried out to study the development of mean velocity profiles of the very far wake behind a wind turbine model in a water flume. The model of the rotor is placed in a middle of the flume. The initial flume flow is subjected to a very low turbulence level, limiting the influence...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2015-06, Vol.625 (1), p.12011
Main Authors: Okulov, V L, Naumov, I V, Mikkelsen, R F, Sørensen, J N
Format: Article
Language:English
Subjects:
Aerodynamic coefficients
Aerodynamics
Attenuation
Low turbulence
Mathematical models
Physics
Rotors
Tip speed
Uniform flow
Velocity
Velocity distribution
Wakes
Wind turbines
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:LDA experiments were carried out to study the development of mean velocity profiles of the very far wake behind a wind turbine model in a water flume. The model of the rotor is placed in a middle of the flume. The initial flume flow is subjected to a very low turbulence level, limiting the influence of external disturbances on the development of the inherent wake instability. The rotor is three-bladed and designed using Glauert's optimum theory at a tip speed ratio λ = 5 with a constant of the lift coefficient along the span, CL= 0.8. The wake development has been studied in the range of tip speed ratios from 3 to 9, and at different cross-sections from 10 to 100 rotor radii downstream from the rotor. By using regression techniques to fit the velocity profiles it was possible to obtain accurate velocity deficits and estimate length scales of the wake attenuation. The data are compared with different analytical models for wind turbine wakes.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/625/1/012011