传统机械式推力矢量喷管结构复杂、射流偏转角度大，而流体式推力矢量结构简单、但存在射流偏转角度小、矢量角控制迟滞突跳现象等问题。本文提出一种具有可动Coanda壁面致偏的二元射流控制装置，采用不同长度的可动壁面诱导射流进行大角度偏转。通过开展对其力矢量角度变化规律与流动结构分析的实验研究，给出了射流在不同壁面长度与射流出口高度之比K下的偏转控制特性，同时结合纹影流动显示技术，给出了射流在高速不同NPR下的偏转特性。实验研究结果表明：在可动壁面偏转去回程过程中，射流都会经历附壁、非稳定波动和离壁三种状态；壁面长度会影响射流离壁与附壁的最大偏转角度，K=20时存在3°迟滞，射流可达到最大偏转角度56°，随K值减小，迟滞逐渐消失，K=5时无迟滞，射流可达到42°偏转角度；在高速情况下，NPR=4.5时，射流在壁面诱导仍可以实现31°的偏转角度。

Traditional mechanical thrust vectoring nozzles feature complex structures and large jet deflection angles, whereas fluidic thrust vectoring nozzles possess simple structures but suffer from small jet deflection angles, as well as hysteresis and sudden jump phenomena during vectoring angle control. In this paper, a two-dimensional jet control device deflected by a movable Coanda wall is proposed, which utilizes movable walls of different lengths to induce large-angle jet deflection. Through experimental research on the variation laws of force vector angles and flow structures, the deflection control characteristics of the jet under different ratios of wall length to jet exit height (K) are presented. Additionally, combined with schlieren flow visualization technology, the deflection characteristics of the jet at high speeds under different nozzle pressure ratios (NPR) are obtained.Experimental results indicate that during the deflecting and returning processes of the movable wall, the jet consistently experiences three states: wall attachment, unstable fluctuation, and wall detachment. The wall length affects the maximum deflection angles during jet detachment and attachment. When K = 20, there is a 3° hysteresis, and the jet can reach a maximum deflection angle of 56°. As the K value decreases, the hysteresis gradually disappears. When K = 5, no hysteresis occurs, and the jet can achieve a deflection angle of 42°. Under high-speed conditions with NPR = 4.5, the wall-induced jet can still achieve a deflection angle of 31°.