Supervisorer: Søren Juhl Andersen og Tuhfe Göçmen
Censor: Nicolai Nygaard
Titel: Accounting for Wake Propagation in Engineering Models
Most of the simple wake models to date only consider steady state operation. No dynamics are
taken into account. A steady state model cannot account for the propagation velocities that are
important for control matters.
The aim of the present thesis is to make a model that accounts for wake propagation velocities.
This means that the time delays in the event of a change in wind or operation need to be accounted.
In order to parametrize the model, Large Eddy Simulation data has been used. With this data,
a cross-correlation analysis has been performed in order to determine the time delays and
consequently propagation velocities. A diameterwise cross-correlation has resulted in better
correlation levels than the total distance cross-correlation. The values for the total distances can
be obtained by addition of the time delays obtained per diameter.
Once, the case studies of the model are compared with a model with a fixed propagation ratio, it
is observed that the model over-estimates propagation velocity.