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- Title
Opposition control of turbulent spots.
- Authors
Wang, Y. X.; Choi, K.-S.; Gaster, M.; Atkin, C.; Borodulin, V.; Kachanov, Y.
- Abstract
Opposition control of artificially initiated turbulent spots in a laminar boundary layer was carried out in a low-turbulence wind tunnel with the aim to delay transition to turbulence by modifying the turbulent structure within the turbulent spots. The timing and duration of control, which was carried out using wall-normal jets from a spanwise slot, were pre-determined based on the baseline measurements of the transitional boundary layer. The results indicated that the high-speed region of the turbulent spots was cancelled by opposition control, which was replaced by a carpet of low-speed fluid. The application of the variable-interval time-averaging technique on the velocity fluctuation signals demonstrated a reduction in both the burst duration and intensity within the turbulent spots, but the burst frequency was increased.
- Subjects
LAMINAR boundary layer; BOUNDARY layer (Aerodynamics); WIND tunnels; BOUNDARY layer control; TURBULENCE
- Publication
Journal of Fluid Mechanics, 2022, Vol 943, p1
- ISSN
0022-1120
- Publication type
Article
- DOI
10.1017/jfm.2022.396