Reducing the consumption of secondary flow is of significance to future development of fluidic thrust vectoring (FTV) technology. A new coflow FTV control method based on sweeping jet (SWJ) excitation is proposed for the deflection of primary jets, and its performance is comparatively examined against conventional steady jet (SJ) excitation. Schlieren visualization using a high-speed camera is applied to provide insights into the flowfields. The results show that at the same mass flow rate of the secondary coflow injection and for Mach numbers of primary flow up to 0.35 SWJ excitation achieves a larger primary flow deflection angle than the SJ excitation does. To examine the flow control mechanisms, clear flow structures are extracted from noisy images by using robust principal component analysis. Moreover, dynamic mode decomposition is applied to investigate the flow dynamics of the primary flow. The SWJ is found to be more capable of enhancing the flow mixing than the SJ is. Furthermore, the SWJ ensures that the primary jet attaches to the nozzle surface and produces a larger deflection angle, which leads to the higher efficiency in coflow vectoring control.

减少二次流的消耗对未来流体推力矢量（FTV）技术的发展具有重要意义。针对主射流的偏转，提出了一种基于扫掠射流（SWJ）激励的新型coflow FTV控制方法，并将其性能与常规稳定射流（SJ）激励进行了比较。使用高速相机的纹影可视化被用于提供对流场的洞察。结果表明，在二次协流注入的相同质量流量下，对于马赫数高达 0.35 SWJ 的一次流，激发实现了比 SJ 激发更大的一次流偏转角。为了检查流动控制机制，使用稳健的主成分分析从嘈杂的图像中提取清晰的流动结构。而且，应用动态模式分解来研究主流的流动动力学。发现 SWJ 比 SJ 更有能力增强流动混合。此外，SWJ 确保主射流附着在喷嘴表面并产生更大的偏转角，从而提高协流矢量控制的效率。