Abstract: The pulsed oscillation nozzle, distinct from traditional nozzles, is an innovative design whose internal structural parameters significantly influence atomization performance. To further investigate the internal turbulence effects and atomization efficiency of this nozzle, this study employed COMSOLfluid simulation software to analyze and simulate the internal jet nozzle length, aspect ratio, and inlet diameter of the pulsed oscillation nozzle. The simulation results indicate that, due to the unique structure of the pulsed oscillation nozzle, turbulent vortices can spontaneously form inside the nozzle. These vortices enhance the further breakup of the fluid within the nozzle, thereby effectively improving atomization performance. Experiments revealed that the atomization effect is optimal when the jet nozzle length is 2 mm, and further increasing the jet nozzle length leads to a decline in fluid velocity inside the nozzle. Simulation experiments with three different aspect ratios showed that as the aspect ratio increases, the kinetic energy of the fluid inside the nozzle continues to rise. Additionally, the inlet diameter significantly affects both the internal fluid velocity and the outlet velocity of the nozzle; an excessively large diameter reduces atomization performance. Experimental results demonstrated that when the inlet diameter is between 8 mm and 10 mm, the fluid velocity inside the nozzle is relatively high, resulting in better atomization performance.