Offshore wind-turbine wake in the vicinity of coastal mountains and islands

Kozmar, Hrvoje and Allori, Davide and Bartoli, Gianni and Borri, Claudio (2015) Offshore wind-turbine wake in the vicinity of coastal mountains and islands. = Offshore wind-turbine wake in the vicinity of coastal mountains and islands. In: 14th International Conference on Wind Engineering, 21.-26.06.2015., Porto Alegre, Brazil.

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Wind-tunnel experiments are carried out to analyze the wind-turbine wake downwind of a mountain. A single wind-turbine model in the wake of four different terrain models is studied. The wind turbine model corresponds to commonly used prototype wind turbines. Terrain models include flat terrain and three mountains of different size and shape. Wake characteristics analyzed with respect to the mean wind velocity, turbulence intensity and velocity power spectra indicate several important findings. The observed flow retardation is more exhibited near the ground surface and the mountains, while this shadowing effect weakens further downwind from the mountains. The mountain-induced flow disturbance enhances with increasing the size and complexity of the mountains. Mean velocities are nearly constant in the lateral direction for all terrain types. Turbulence intensity in the wake of the mountain and wind turbine is considerably larger than in the atmospheric boundary layer due to strong flow pulsation and recirculation, as well as a reduction in the mean wind velocity. Turbulence intensity is larger for more complex terrains, it dies out when moving further downwind from the mountain. Velocity power spectra are strongly influenced by the terrain complexity, whereas the effects of the mountain and surface roughness are mostly constrained up to the double mountain height. There is a strong energy content at frequencies corresponding to a free shear layer separating from the mountain ridge.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): Offshore wind turbine, coastal mountains and islands, aerodynamics, wake, wind-tunnel experiments
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 1400 Department of fluid mechanics > 1420 Chair of environment and construction aerodynamics
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 13 Apr 2016 11:43
Last Modified: 23 Aug 2017 07:54

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