关键词: 偏航控制, 射流舵, 流体推力矢量, 内外流耦合, 分布式控制

Abstract: To address the large mechanical weight, poor low-speed control effectiveness, and severe cross-axis coupling caused by yaw control of stealth-constrained flying wings using split-drag rudders, this paper proposes an innovative distributed jet-rudder yaw-control method. Unlike existing active flow-control approaches that primarily regulate the momentum coefficient, the proposed system maintains a constant momentum coefficient while rapidly switching jet-deflection combinations to form different yaw-control schemes and achieve discretely tunable yaw-moment outputs. A wind-tunnel wing model with distributed jet rudders was built, and six yaw-control schemes were designed. The control effectiveness and cross-axis coupling of the distributed jet rudder and split-drag rudder were compared, and particle image velocimetry (PIV) was used to quantify trailing-edge flow structures before and after actuation. Results show that, over angles of attack from ?6° to 6°, the optimal jet-rudder scheme yields a drag increment exceeding that of an 80°-deflected split-drag rudder and a yawing moment larger than that of a 60°-deflected split-drag rudder. Over ?6° to 14°, the mean rolling-moment increment is 4.38%, indicating reduced coupling. Flow analysis shows a “virtual hump” induced by the jet rudder blocks the incoming flow, contributing to drag and yawing-moment generation. The distributed jet rudder can potentially assist or replace split-drag rudders for yaw control of advanced tailless aircraft.

Key words: Yaw Control, Jet Rudder , Fluidic Thrust Vectoring, Internal–External Flow Coupling, distributed control