caa a22 4500 606198245 CHVBK 20210128100933.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s00348-015-1952-4 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1952-4 Three-dimensional flow structure along simultaneously pitching and rotating wings: effect of pitch rate [Elektronische Daten] [M. Bross, D. Rockwell] The flow structure along a simultaneously pitching and rotating wing is investigated using quantitative flow visualization. Imaging is performed for a range of pitch rates, with emphasis on the three-dimensional structure during start-up and relaxation. Surfaces of transparent iso-Q and helicity are employed to interpret the flow physics. The onset and development of the components of the vortex system, i.e., the leading-edge, tip, and trailing-edge vortices, are strongly influenced by the value of pitch rate relative to the rotation rate. Comparisons at the same angle of attack indicate that the formation of vortical structures is delayed with increasing pitch rate. However, comparisons at the same rotation angle for different values of pitch rate reveal similar flow structures, thereby indicating predominance of rotation effects. Extreme values of pitch rate can lead to radically different sequences of development of the components of the three-dimensional vortex system. Nevertheless, consistently positive vorticity flux is maintained through these components and the coherence of the vortex system is maintained. Springer-Verlag Berlin Heidelberg, 2015 Bross M. Department of Mechanical Engineering and Mechanics, Lehigh University, 18015, Bethlehem, PA, USA aut Rockwell D. Department of Mechanical Engineering and Mechanics, Lehigh University, 18015, Bethlehem, PA, USA aut Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-14 0723-4864 56:4<1 2015 56 348 https://doi.org/10.1007/s00348-015-1952-4 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/s00348-015-1952-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bross M. Department of Mechanical Engineering and Mechanics, Lehigh University, 18015, Bethlehem, PA, USA aut NATIONALLICENCE 700 1- Rockwell D. Department of Mechanical Engineering and Mechanics, Lehigh University, 18015, Bethlehem, PA, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/4(2015-04-01), 1-14 0723-4864 56:4<1 2015 56 348