ENHANCED MANEUVERABILITY BY ACTIVE VORTEX CONTROL WITH MOVEABLE BLOWING JET

摘要

Water tunnel experiments were conducted on arn65u0001 delta wing/centerbody half-model to explorernthe effectiveness of blowing into the leadingedgernvortex through a moveable nozzle torncontrol its breakdown. Tests conducted with thernnozzle moving along the leading edge, wingrnsurface and centerbody, revealed that therncontrol power required to influence thernbreakdown process is a highly non-linearrnfunction of blowing location when the jetrnimpinges on the vortex near its breakdown.rnThe positive feedback implicit in the breakdownrnprocess is exploited to minimize the controlrnmass flow required to position the breakdown atrna desired location. Physical explanations arernprovided to explain the experimentalrnobservations. A novel concept, based on thernabove considerations, is proposed to enhancernthe maneuverability and controllability ofrnadvanced vehicles by using a moveable blowingrnjet impinging with a certain orientation at thernoptimum distance to the vortex breakdownrnlocation. Given the dominant effect ofrnbreakdown on airloads at high incidence andrnhigh angular rates, the proposed method can bernused to control lift, pitching and rollingrnmoment.