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Performance improvement of Riblets in a Turbine Center Frame and their material development for high temperature environments

: Leitl, Peter A.; Feichtinger, Christoph; Hafizovic, Asim; Kowalik, Yvonne; Reschenhofer, Bernhard; Merli, Filippo; Brinkmann, Andreas; Flanschger, Andreas; Göttlich, Emil; Stenzel, Volkmar; Marn, Andeas


American Institute of Aeronautics and Astronautics -AIAA-, Washington/D.C.; Aerospace Research Central -ARC-:
AIAA Scitech Forum 2021 : 11-15 & 19-21 January 2021, Virtual Event
Reston, Va.: AIAA, 2021
ISBN: 978-1-62410-609-5
Paper AIAA 2021-0033, 20 pp.
Science and Technology Forum and Exposition (SciTech Forum) <2021, Online>
Conference Paper
Fraunhofer IFAM ()

The effects of using microstructures (riblets) on the surface of strut, hub and shroud of a turbine center frame (TCF) are experimentally investigated. Riblets are streamwise grooved surfaces which reduce the viscous drag in turbulent boundary layers. The present work gives a closer insight into the application and measurement results of riblets on a TCF strut, hub and shroud. The change in the flow behavior and reduction in total pressure loss was investigated in the cold flow test facility TTTF at TU Graz representing a turbofan engine setup containing a high-pressure stage with TCF and low-pressure turbine nozzle. Additionally, material development for the application of riblets in hot flow environments of experimental turbines is presented as part of an ongoing research project.