caa a22 4500 606197346 CHVBK 20210128100929.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s00348-015-1988-5 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1988-5 Boundary-layer transition on a rotor blade measured by temperature-sensitive paint, thermal imaging and image derotation [Elektronische Daten] [W. Lang, A. Gardner, S. Mariappan, C. Klein, M. Raffel] Transition measurements using temperature-sensitive paint (TSP) and infrared (IR) imaging are shown for a model-scale rotor blade using derotation by an axial rotating mirror. Measurements were performed on a modified NACA0015 blade model by different angles of attacks at low-speed conditions. The effective angle of attack was computed from the geometric angle of attack and the downwash measured using particle image velocimetry (PIV) and from numerical computations by an actuator disc method based on blade element theory. The transition over a laminar separation bubble was detected in TSP and IR results for all investigated angles of attack. Additional two-dimensional high-resolution PIV measurements were performed near the surface of the modified NACA0015 model. The mean point of laminar separation (LS) and mean point of turbulent reattachment (TR) were extracted from TSP results. The single transition point was set at the 50% between LS and TR and compared with predictions from Euler-boundary-layer code with an envelope-eN transition prediction. Springer-Verlag Berlin Heidelberg, 2015 Lang W. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut Gardner A. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut Mariappan S. Department of Aerospace Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, India aut Klein C. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut Raffel M. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut Experiments in Fluids Springer Berlin Heidelberg 56/6(2015-06-01), 1-14 0723-4864 56:6<1 2015 56 348 https://doi.org/10.1007/s00348-015-1988-5 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/s00348-015-1988-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lang W. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut NATIONALLICENCE 700 1- Gardner A. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut NATIONALLICENCE 700 1- Mariappan S. Department of Aerospace Engineering, Indian Institute of Technology Kanpur, 208016, Kanpur, India aut NATIONALLICENCE 700 1- Klein C. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut NATIONALLICENCE 700 1- Raffel M. German Aerospace Center (DLR), Bunsenstrasse 10, 37073, Göttingen, Germany aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/6(2015-06-01), 1-14 0723-4864 56:6<1 2015 56 348