Colloquium: Ahmed Valentin Kassem (AWEP)

29 november 2019 10:00 - Locatie: Lecture Hall C, Faculty of Aerospace Engineering, Kluyverweg 1, Delft.

Wind Gust Generation for Wind Turbine Testing via Numerical Methods

The modelling of gust generation via an array of oscillating vanes at Delft's University of Technology Open Jet Facility is proposed. The focus is placed on identification of relevant in-field gusts that horizontal axis wind turbines are exposed to and reproduction via numerical methods in the wind tunnel setting. A computationally efficient model is developed based on potential flow theory. The model validation showed good results, with <5% errors when used within its limitations. Several vane configurations are proposed. Veer profiles representative of all atmospheric stability conditions are simulated as well as a maximum profile with veer angle difference between the top and bottom of the rotor of up to 20 degrees. A coupling between the trailing vorticity of the vanes and achieved veer profile is identified. Streamwise velocity component temporal variation is achieved, however, not following the intended gust profile. Peak to trough velocity variation of up to 45% of the free stream value is observed.