Abstract
Laser-Doppler measurements are presented for a highly curved flow resulting from the collision of plane turbulent wall jet with a boundary layer. This configuration can be found in the case of impinging jets of a V/STOL aircraft operating in ground vicinity. The experiments were carried out for boundary layer to wall jet velocity ratio of 0.5. The results include mean and turbulent velocity characteristics of the flow field as well as the characterization of the vorticity. The results revealed the existence of very small recirculation zones located upstream the separation point that co-exist and interact with the very well known VSTOL ground vortex. Nomenclature D = diameter of the jet at the nozzle exit (VSTOL application) f = frequency of oscillation of the ground vortex h = height of the rectangular jet nozzle slit (present geometry) H = distance from the nozzle exit to the ground plane hv = ground vortex height u, U, u’ = instantaneous, mean, turbulent horizontal velocity component, ′
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