Leitl, Peter A.Peter A.LeitlFeichtinger, ChristophChristophFeichtingerHafizovic, AsimAsimHafizovicKowalik, YvonneYvonneKowalikReschenhofer, BernhardBernhardReschenhoferMerli, FilippoFilippoMerliBrinkmann, AndreasAndreasBrinkmannFlanschger, AndreasAndreasFlanschgerGöttlich, EmilEmilGöttlichStenzel, VolkmarVolkmarStenzelMarn, AndeasAndeasMarn2022-03-142022-03-142021https://publica.fraunhofer.de/handle/publica/40978610.2514/6.2021-0033The 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.en620660671conference paper