Experimental investigation of noise generated by finite, wall-mounted airfoils  Seminar

The vortex that is generated at the tip of the blades of wind turbines, fans or propellers is a significant source of flow-induced noise. In order to better understand the noise generation at the blade tip, an extensive wind tunnel study was performed on model blades with different shape (airfoil thickness and camber) and different tip geometries (for example flat or rounded tips). In addition, further experiments were performed on a set of novel blade tips, which were modified with either perforations, serrations or end plates. The aim of this study 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, surface flow visualizations and hot-wire measurements were conducted to help analyzing the effect of the modifications on the flow field around the blade tips. In the presentation, an overview of the extensive experimental study will be given, with several examples to demonstrate important results.

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