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- Title
Laser-Doppler Analysis of the Separation Zone of a Ground Vortex Flow.
- Authors
Silva, André R. R.; DurAo, Diamantino F. G.; Barata, Jorge M. M.; Santos, Pedro; Ribeiro, Samuel
- Abstract
Laser Doppler measurements are presented for a highly curved flow generated by the collision of plane wall turbulent jet with a low-velocity boundary layer. The experiments were performed for a wall jet-to-boundary layer velocity ratio of 2, and include mean and turbulent velocity characteristics along the two normal directions contained in planes parallel to the nozzle axis. The results, which have relevance to flows encountered by powered-lift aircraft operating in ground effect, quantify the structure of the complex ground vortex flow resulting from the collision of a wall jet with a boundary layer. The results revealed the existence of a very low-frequency instability. The source of this low frequency unsteadiness is probably associated with a small vortex located near the separation point. In the central zone of the upwash flow where the maximum values of the vertical velocity component occurs, additional distinct high frequency peaks were also identified.
- Subjects
LASER Doppler velocimeter; AIRCRAFT accidents; GROUND-cushion phenomenon; TURBULENT boundary layer; WALL jets; SPEED; VORTEX motion; BOUNDARY layer (Aerodynamics); UNSTEADY flow
- Publication
International Review of Aerospace Engineering, 2009, Vol 2, Issue 3, p167
- ISSN
1973-7459
- Publication type
Article