Simulation and Modeling of Wakes behind Wind Turbine Rotors and in Wind Farms
Event details
| Date | 29.05.2012 |
| Hour | 16:15 › 17:15 |
| Speaker | Dr Jens Norkaer Sorensen, Dept. of Mechanical Engineering, Technical University of Denmark |
| Location | |
| Category | Conferences - Seminars |
The wake behind a rotor consists essentially of a number of helical vortices that owing to roll-up effects mainly concentrates in tip and root vortices. Near wake features are related to the genesis of the vortex system where the presence of the rotor is felt directly. The far wake is usually the downstream position where the wake dynamics no longer depends on the rotor characteristics. In the past decade we have been studying wakes behind wind turbine blades using analytical tools as well as numerical simulations based on LES methodology and various versions of the immersed boundary technique, such as the actuator line. In the presentation we show that helical wakes are inherent unstable and demonstrate how the ambient turbulence influences the stability properties. Furthermore, we identify one of the main instability mechanisms to be related to vortex pairing. Another part of the work is focused on the interaction of wakes originating from two or more rotors placed close to each other. This is in particular of importance for wind turbines located in wind farms. In the presentation, we show some basic results from the stability analysis as well as numerical simulations of single wakes and interacting wakes, including comparisons to experimental results.
Practical information
- General public
- Free
- This event is internal
Contact
- Prof. Fernando Porte Agel