Investigations On Control Characteristics Of Forebody Asymmetric Vortices Based On Alternating Synthetic Jet

In order to improve the feasibility of forebody vortex control based on alternating synthetic jet during the flight,the interference effect produced by dual synthetic jet located on the nose tip on flow field must be greater than the background disturbance.Therefore,under the condition of no cross flow,the influence of synthetic jet on the flow around are studied.The result is the upstream flow is weak,carried by the synthetic jet.Orientation on both sides of the jet,regardless of the coming flow,the deflection direction of the jet is always from high speed side towards the low speed side.The coming flow parallel to the symmetry plane of the double outlet of the synthetic jet,has weakened the interference between the dual outlet,and made the deflection direction of the flow is always from low speed side towards the high speed side.Without yaw/roll,as the frequency is 90 Hz,forebody vortex continuous control based on alternating synthetic jet is achieved,by changing the duty cycle,regardless of the effect of artificial passive disturbance.Changing control frequency,the linear control of section lateral force coefficient is achieved when the control frequency is 50 Hz,with the forebody vortex oscillating sharply under control.When the control frequency is 50 Hz,forebody vortex continuous control is still realized,and the foredody vortex is in a quasi-steady state under control.Under the condition of small yaw angle or roll angle,the ability of active control of forebody vortex based on alternating synthetic jet is verified by experiments.And tail spin control model of flight test verification is studied.