Dipl.-Ing. Tobias Willeke
Proof of the Aerodynamic Potential of Grinded and Lasered Riblets in a Highly Loaded Axial Compressor (VIPlets)
The research focus lies on the aerodynamic analysis of riblet-structured blade surfaces in an axial compressor. These riblet structures are. When riblet dimensions are properly chosen in accordance with the local flow conditions and oriented parallel to the flow direction, these microscopic grooves are capable of reducing the wall shear stress by 8% with respect to the smooth surface. Previous studies showed, that riblets can reduce the profile loss of two-dimensional compressor cascades significantly. Based on these results, the current project applies riblets to the three-dimensional blading of a multi-stage axial compressor, which was designed and engineered at the Institute of Turbomachinery and Fluid Dynamics (TFD). The riblets will be manufactured by grinding (Institute of Production Engineering and Machine Tools, IFW) and by laser ablation (Institute for Transportation and Automation Technology, ITA). The aerodynamic effects of the riblets will be investigated experimentally at TFD. A comparison between the smooth and the riblet-strcutured compressor blade performance will result in a proof of the potential for aerodynamic improvements by riblets in axial compressors.
This project is funded by the Federal Ministry of Education and Research in the funding program “Validation of the Innovation Potential of Scientific Research - VIP”.