Supersonic antigravity aerodynamic atomization dusting nozzle based on the Laval nozzle and probe jet

Abstract

To improve the trapping efficiency of respiratory dust by aerodynamic atomization and to maintain the health and safety of workers, a numerical simulation (droplet fragmentation and particle tracking in a high Mach number flow) and an aerodynamic atomization experiment were adopted on the basis of the existing supersonic aerodynamic atomization nozzles that utilize the Laval nozzle as the core. A new type of this kind of nozzle based on a probe structure was designed and optimized. Both the simulation and experimental results have shown that the probe injection method is more suitable for the progress of supersonic aerodynamic atomization. The new nozzle inherits the characteristics of fast droplet speed, conservation of water and pressure, long-range and slow attenuation. The atomization performance of the new nozzle is better than that of traditional nozzles at the same power, and the new nozzle has a larger atomization angle, smaller atomization granularity, lower noise and a more stable atomization output. For the first time, the process of breaking particles by using supersonic gas in the field of dust removal is truly realized. When the pressure is more than 0.1 MPa, antigravity water absorption can be realized. The dust removal rate can be approximately twice as high as that of the traditional ultrasonic atomization method. Compared with the traditional ultrasonic atomization method (84.75%), the dust isolation efficiency can reach 94.07%. The droplets of ultra-fine size with high-speed produced by the new nozzle will have a strong trapping effect on respiratory dust and will save more energy by the vacuum force siphon than currently used nozzles (the amount of gas saved by the same efficiency is 40% and the amount of water saved is 45%).