Experimental investigations on the wake interferences of multiple wind turbines

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2012-01-01
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Ozbay, Ahmet
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Hui Hu
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Aerospace Engineering

The Department of Aerospace Engineering seeks to instruct the design, analysis, testing, and operation of vehicles which operate in air, water, or space, including studies of aerodynamics, structure mechanics, propulsion, and the like.

History
The Department of Aerospace Engineering was organized as the Department of Aeronautical Engineering in 1942. Its name was changed to the Department of Aerospace Engineering in 1961. In 1990, the department absorbed the Department of Engineering Science and Mechanics and became the Department of Aerospace Engineering and Engineering Mechanics. In 2003 the name was changed back to the Department of Aerospace Engineering.

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1942-present

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  • Department of Aerospace Engineering and Engineering Mechanics (1990-2003)

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In this study, a wind tunnel investigation was carried out to investigate the wake interferences of multiple wind turbines sited over flat and complex (2D-Ridge) terrains in order to understand the physics behind the wind farm design optimization for higher power yield and better durability. The experiments were conducted in Aerodynamic/Atmospheric Boundary Layer (AABL) Wind Tunnel with an array of model wind turbines over flat and complex terrains with non-homogenous surface winds. The effects of the turbine spacing and the wind farm layout on the wake interferences were investigated among multiple wind turbines sited over flat and complex (2D-Ridge) terrains.

The characteristics of the surface winds (mean velocity and turbulence profiles) were quantified by using cobra probe in order to elucidate the interaction between atmospheric boundary layer and wind farms. The detailed flow field measurements were correlated with the dynamic wind loads as well as the power outputs of the wind turbine models. Thus, different wind farm layouts (aligned and staggered) were analyzed in terms of their performance.

The effects of the characteristics of the incoming atmospheric boundary layer (mean velocity and turbulence intensity profiles) on the performance of the individual wind turbines and on the array efficiency of different wind farm layouts were also investigated.

The results obtained from the present study shed light on how complex dynamics of the wind farms could be affected by different factors such as the wind farm configuration, turbine spacing, incoming flow character, topography of the terrain (complex terrains) and operating conditions of the upstream turbines.

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Sun Jan 01 00:00:00 UTC 2012