Research On Active Flow Control Technology For Flying Wing Layout Vehicle Performance Improvement

The flying wing layout aircraft has excellent aerodynamic efficiency and stealth performance because it has eliminated stabilizers such as flat tail,vertical tail,and duck wing.However,when flying at a high angle of attack,flow separation is prone to occur,which greatly threatens flight safety.Active flow control is to change the structure of the flow field by applying appropriate disturbances in the flow field to couple the flow with the input disturbance.The purpose of this study is to improve the flow field characteristics of the flying wing layout aircraft through active flow control,and then improve its flight performance,which will have guiding significance for the flow control of the flying wing layout aircraft.Taking flying wing layout aircraft as the research object,using NS-DBD’s active flow control technology and numerical simulation as a means to study the effects of low speed and subsonic conditions on the performance of the aircraft;and changing the parameters to study the subsonic conditions The parameter that has the greatest influence on the control effect.The results show that the nanosecond pulsed dielectric barrier discharge has a good control effect on the wing layout aircraft at low speeds,and can increase or decrease drag;the control of the leading edge vortex of the wing is the flow control of the wing layout aircraft After the excitation of the leading edge of the wing,the wave generated by the excitation effectively restrained the vortex breaking of the leading edge and produced a good control effect.The maximum increase effect can reach16.5%.The selection of excitation parameters under subsonic conditions needs to be greatly increased compared to low speed conditions.The discharge frequency has a greater impact on the control effect,which can effectively improve the control effect;the increase in energy density changes the moment when the lift coefficient peak appears in the excitation period,but has no significant effect on the control effect;increasing the pulse width also has a control effect Little impact.Under subsonic conditions,it has certain control effect on the flow field characteristics.