caa a22 4500 606197788 CHVBK 20210128100931.0 cr unu---uuuuu 210128e20151201xx s 000 0 eng 10.1007/s00348-015-2083-7 doi (NATIONALLICENCE)springer-10.1007/s00348-015-2083-7 Control of flow around a circular cylinder by bleed near the separation points [Elektronische Daten] [Xu-Dong Shi, Li-Hao Feng] The flow around a circular cylinder under bleed control is experimentally investigated in a water tunnel. The bleed jets are issued from the narrow slots directed from the front stagnation point to the positions near the upper and lower separation points. The Reynolds numbers based on the cylinder diameter are Re=400, 780, and 1470, while the widths of the bleed slot are selected as w/D=0.05, 0.1, and 0.2. The bleed jet interacts with the boundary layer, postponing the separation point to be near the downstream edge of the slot. It further modifies the wake shear layer, which moves away from the centerline. Thus, the recirculation bubble downstream of the circular cylinder is enlarged and the near wake width are increased, resulting in an increased vortex formation length and a decreased vortex shedding frequency. Such changes of the flow field increase with the bleed width. The vortex dynamics is also analyzed, showing that the wake pattern could be modified by the bleed control. The wake vortex is converted into a bistable mode at w/D=0.1 and 0.2, Re=780 and 1470, where the symmetric and asymmetric modes are both observed, while all the control cases at Re=400 still show the asymmetric mode. Springer-Verlag Berlin Heidelberg, 2015 Shi Xu-Dong Fluid Mechanics Key Laboratory of Education Ministry, Beijing University of Aeronautics and Astronautics, 100191, Beijing, People's Republic of China aut Feng Li-Hao Fluid Mechanics Key Laboratory of Education Ministry, Beijing University of Aeronautics and Astronautics, 100191, Beijing, People's Republic of China aut Experiments in Fluids Springer Berlin Heidelberg 56/12(2015-12-01), 1-17 0723-4864 56:12<1 2015 56 348 https://doi.org/10.1007/s00348-015-2083-7 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/s00348-015-2083-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shi Xu-Dong Fluid Mechanics Key Laboratory of Education Ministry, Beijing University of Aeronautics and Astronautics, 100191, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Feng Li-Hao Fluid Mechanics Key Laboratory of Education Ministry, Beijing University of Aeronautics and Astronautics, 100191, Beijing, People's Republic of China aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/12(2015-12-01), 1-17 0723-4864 56:12<1 2015 56 348