Yaw stabilization and maneuvering control of tailless flying wing by co-directional fluidic thrust vectoring

Fluidic Thrust Vectoring (FTV) is used for the yaw attitude control of tailless flying wing, which can significantly improve stealth performance, maneuverability and lateral/heading maneuverability. The FTV control scheme of co-directional secondary flow was designed based on a 30 kgf thrust turbojet engine, an equivalent rudder deflection control variable of Mass Flow Combination (MFC) was proposed, and a control model was established to form a FTV control system scheme, which was integrated with the flight control system of a 100 kg tailless flying wing with medium aspect ratio to achieve closed-loop control of the yaw attitude based on FTV. The heading stability augmentation and maneuvering control characteristics and time response characteristics of tailless flying wing by FTV were quantitatively studied through virtual flight test in a wind tunnel at a wind speed of 35 m/s. The results show that the control strategy based on MFC achieves bidirectional continuous and stable control of thrust vector angle in a range of ±11°, and the thrust vector angle varies monotonically with MFC; the co-directional FTV realizes bidirectional continuous and stable control of the yaw attitude of tailless flying wing, without longitudinal/lateral coupling moment. The increment of the maximum yawing moment coefficient is 0.0029, the maximum yaw rate is 7.55 (°)/s, and the response time of the yaw rate of the vectoring nozzle actuated by the secondary flow is about 0.06 s, which satisfies the heading stability augmentation and maneuvering control response requirements of the aircraft with statically unstable heading, and provides new control means for the heading rudderless attitude control of tailless flying wing.