Wind-farm blockage is a topic of interest to the industrial wind-energy community in light of the systematic losses that it implies, losses that cannot be estimated with the current assessment methods based on the wake-model idea. This loss comes from the upstream velocity decrease due to the drag imposed by the wind turbines, providing a discrepancy between the actual wind and the one determined by the local climatology before the farm construction. The presentation will show recent evidence about the existence of global blockage from several wind-tunnel experiments and how numerical simulations are challenged in the characterisation of this small effect. A theoretical model based on linearised equations will be also proposed as a first attempt to quantify blockage effects.
About the Speaker
Antonio Segalini got his PhD at the University of Bologna (Italy) in 2010 and became researcher in wind energy in 2013 at KTH Royal Institute of Technology (Stockholm, Sweden). He has been active in the experimental, numerical and theoretical analysis of wind-turbine and wind-farm flows as well as in the description of the atmospheric boundary layer by means of measurements and modelling. Other research areas include turbulent boundary layer scaling and linear stability analysis of laminar and turbulent flows.
Host: Professor Leonardo Chamorro