A novel method is proposed for the dynamic manipulation offorebody vortices of high-performance aircraft during flight at highincidence to provide increased lateral controllability when the controlauthority available from conventional control surfaces is dramaticallydegraded due to severe flow separation. The method takes advantage ofthe inherently bistable nature of the forebody vortices by deliberatelyswitching them between their two stable states at a high frequency. Dutycycle modulation of the alternating blowing from two forward facingnozzles is used to control the mean lateral aerodynamic forces andmoments. A series of wind- and water-tunnel experiments onogive-cylinders and a schematic aircraft configuration have shown thatby appropriately placing the nozzles, it is possible to obtain a linearrelationship between duty cycle and mean control load, a highlydesirable characteristic from a flight control point of view
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