The formation of a ground vortex at the inlet of a cylindrical nacelle operating in suction near a ground plane in the presence of crosswind is significantly delayed in wind tunnel experiments using aerodynamic bleed. Peripheral bleed actuation of the external airstream is utilized to alter and delay the near-ground flow reversal on the leeward side, which precedes the vortex initiation. It is shown that azimuthally symmetric or asymmetric bleed configurations can significantly delay the ground vortex formation, although at the expense of the decreased total pressure recovery. Utilization of about 21% global porosity over the upper inlet surface can delay the vortex formation to over 300% of the required dimensionless inlet momentum flux in the absence of control. Moreover, the circulation of a ground vortex that eventually forms in the presence of the asymmetric bleed actuation is reduced by nearly 40% compared to the corresponding ground vortex in the absence of control.
Control of a Nacelle Inlet Ground Vortex in Crossflow
AIAA Journal ; 63 , 6 ; 2199-2210
01.06.2025
Aufsatz (Konferenz) , Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Control of a Nacelle Inlet Ground Vortex
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