Abstract：In order to improve the effect of spray nozzle, the ultrasonic theory was applied to the liquid jet atomization, the numerical model of internal flow field characteristics of ultrasonic atomization nozzle were established, and the different nozzle jet pressure inside the distribution of velocity field were simulated by fluid simulation software CFD. The numerical calculation results show that the ultrasonic velocity distribution obviously enhances the nozzl turbulence effect, thus improves the atomization of liquid. Along the axis of the nozzle inside, the parabolic trend of speed show increases firstly and then decreases. With the increase of droplet jet pressure, the internal velocity and turbulence effect is strengthened. The ultrasonic atomization nozzle design provides a good theoretical basis. By comparing to other types of nozzle, ultrasonic atomizing spray nozzle efficiency significantly increased, it shows that ultrasonic is applied to nozzle area is feasible.

Keywords: ultrasonic nozzle; atomization characteristics; velocity distribution