Experimental investigation of novel, low-noise turbine blade tip designs
* Präsentierender Autor
Zusammenfassung:The vortex that is generated at the tip of wind turbine blades is a significant source of flow-induced noise and as such a major limitation to the expansion of wind power. In order to better understand the noise generation at the blade tip, an extensive wind tunnel study was performed on model blades with different tip geometries (for example flat or rounded tips). This was done both for the case of natural transition as well as for a forced transition of the boundary layer. In a second step, additional experiments were performed on a set of novel blade tips, which were modified with either perforations, serrations or side plates. The aim of this project is to empirically determine tip designs that lead to a notable noise reduction while maintaining the aerodynamic performance of an unmodified tip. In addition to acoustic microphone array measurements, hot-wire measurements were conducted to help analysing the effect of the modifcations on the flow field around the blade tips. In the presentation, an overview of the extensive experimental study and the resulting large dataset will be given, with several examples to demonstrate important results. The presentation will be given in German.