caa a22 4500 606197257 CHVBK 20210128100928.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00348-015-1992-9 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1992-9 Boundary layer transition determination for periodic and static flows using phase-averaged pressure data [Elektronische Daten] [A. Gardner, K. Richter] A method of boundary layer transition measurement is presented for wind tunnel models instrumented with surface pressure taps. The measurement relies on taking a number of theoretically identical measurements at different times and then analysing the standard deviation of the pressures. Due to the slight unsteady movement of the transition position, a peak in the standard deviation of pressure $$\sigma C_{P_{{\rm peak}}}$$ σ C P peak is found at the transition position, and this is correlated with measurements of the transition position with an infrared camera and hot-film anemometers. In contrast to microphone measurements, it is shown that the transition detection works for data which have been low-pass filtered with a cut-off of 1Hz. The application to static and dynamic transition measurements on static and periodically pitching helicopter rotor blade airfoils at Mach 0.3-0.5 is demonstrated. Springer-Verlag Berlin Heidelberg, 2015 Gardner A. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut Richter K. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut Experiments in Fluids Springer Berlin Heidelberg 56/6(2015-06-01), 1-13 0723-4864 56:6<1 2015 56 348 https://doi.org/10.1007/s00348-015-1992-9 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1992-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gardner A. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut NATIONALLICENCE 700 1- Richter K. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/6(2015-06-01), 1-13 0723-4864 56:6<1 2015 56 348