Articles | Volume 5, issue 3
Research article
07 Jul 2020
Research article |  | 07 Jul 2020

On the velocity at wind turbine and propeller actuator discs

Gijs A. M. van Kuik


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Short summary
The paper compares actuator discs in propeller and wind turbine mode. At very low rotational speed, propeller discs have an expanding wake while still energy is put into the wake. The velocity at the disc in the plane containing the axis is practically uniform: a few per mille deviation for wind turbine discs and a few per cent for propeller discs. The deviations are caused by the different strengths of the singularity in the wake boundary vorticity strength at its leading edge.
Final-revised paper