This Paper discusses the results of an experimental study to investigate the performance of a converging nozzle with fluidic thrust vectoring, using secondary-jet injection, through the measurements of various parameters such as thrust, flow rates, and pressures over a range of operating conditions. The thrust coefficient is found to be dependent on the nozzle pressure ratio (NPR) of the primary nozzle and momentum ratio or mass ratio of the primary and secondary mass flows. The vector angle is found to depend only on momentum ratio or mass ratio and independent of the NPR. The secondary-jet injection is observed to increase the magnitude of net thrust by reducing the effective flow area while reducing the thrust coefficient. It is established that four additional parameters, namely, the fluidic thrust vectoring coefficient, nondimensional mass flow rate of the core jet, nondimensional mass flow rate of secondary jet, and mass ratio, are required to describe the vectoring performance comprehensively. The mass ratio appears to be a suitable parameter for developing the control algorithms as the other dependent parameters are linear functions of the mass ratio. Using an example, a procedure to identify the operational zone over the nozzle characteristic map is demonstrated.

本文讨论了一项实验研究的结果，该实验通过测量各种工作条件下的各种参数（例如推力，流量和压力），使用二次喷射喷射来研究具有流体推力矢量的会聚喷嘴的性能。发现推力系数取决于主喷嘴的喷嘴压力比（NPR）以及主质量流量和次质量流量的动量比或质量比。发现矢量角仅取决于动量比或质量比，并且与NPR无关。观察到二次喷射通过减小有效流动面积同时减小推力系数来增加净推力的大小。确定了四个附加参数，即流体推力矢量系数，要全面描述矢量化性能，需要使用芯射流的无量纲质量流量，次级射流的无量纲质量流量以及质量比。质量比似乎是用于开发控制算法的合适参数，因为其他相关参数是质量比的线性函数。通过一个示例，演示了在喷嘴特性图上标识操作区域的过程。