The mechanism of the self-excited oscillation pulsed jet is still in a period of continuous improvement, and the application breadth and depth of the self-excited oscillation nozzle are significantly limited since the turbulent flow field inside the self-excited oscillation nozzle is exceptionally complex. In this study, computational fluid dynamics numerical simulation and experimental research methods are combined. By changing the structural parameters of self-excited oscillating nozzles, the velocity and pressure characteristics of the self-excited oscillating nozzles were compared and analyzed to determine the important factors that influenced the effect of pulsed jet. These findings demonstrated that the periodic expansion and contraction of the low-pressure vortex ring in the self-excited oscillation nozzle chamber will cause the pressure of the nozzle outlet section to change periodically. The periodic high-voltage blocking and low-pressure speedup of the outlet directly correlate with the pulsed jet. This study shows the reasonable size design range of the self-excited oscillation nozzle, which can guide the design and practical application of the nozzle, as well as provide the theoretical basis for perfecting the self-excited oscillation pulsed jet theory.

自激振荡脉冲射流的机理仍处于持续改进的时期，并且由于自激振荡喷嘴内部的湍流场极其复杂，自激振荡喷嘴的应用广度和深度受到极大限制。 。本研究将计算流体动力学数值模拟与实验研究方法相结合。通过改变自激振荡喷嘴的结构参数，对自激振荡喷嘴的速度和压力特性进行比较和分析，以确定影响脉冲喷射效果的重要因素。这些发现表明，在自激振荡喷嘴室中低压涡流环的周期性膨胀和收缩将导致喷嘴出口部分的压力周期性地变化。出口的周期性高压阻塞和低压加速与脉冲射流直接相关。本研究表明了自激振荡喷嘴的合理尺寸设计范围，可以指导自激振荡喷嘴的设计和实际应用，并为完善自激振荡脉冲射流理论提供理论依据。