Document Type : Research Paper
Mechanical Engineering Faculty, K. N. Toosi University of Technology, Tehran, Iran
Kiel University of Appliyed Science, Kiel, Germany
Mechanical Engineering Faculty, University of Tehran, Tehran, Iran
The shape of wake behind a wind turbine is normally assumed to have a hat shape for the models used in wind farm layout optimization purposes; however, it is know from experimental tests and numerical simulations that this is not a real assumption. In reality, the results of actual measurements and detailed numerical simulation show that the velocity in wake region has a S-shape profile. The present study calculated a semi-analytical profile for the shape of the wake behind a wind turbine using blade element momentum method. It is shown that the wake shape differs in different operational conditions and geometrical characteristics of the wind turbine.