Bird tail aerodynamics: a turbulent story
| Quand ? |
Le 07/01/2025, de 11:00 à 12:00 |
|---|---|
| Où ? | MGN1 107 |
| Participants |
Ariane Gayout |
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Turbulence is omnipresent in the environment in which birds fly. In particular, landing mostly happens within the atmospheric boundary layer, often in the direct wake of trees or buildings. This exposes birds to highly turbulent flows whenever they deploy their tails with high angles of attack and various spreads. Maintaining aerodynamic performances in such configuration is especially crucial as flight speed tends to zero. In this talk, I will investigate experimentally the combined effect of spreading and turbulence on a bio-hybrid pigeon tail over its entire range of angles of attack. I will first delve into the effect of tail spread, through force measurements and flow visualization. As turbulence is introduced, I will then show how the wake of the tail unexpectedly ‘stabilizes’, concurring with a remarkable enhancement of the tail aerodynamic efficiency. This beneficial wake-turbulence interaction not only provides insights on bird flight strategies but also bioinspiration for novel aircraft designs in enhanced turbulence.