6th INTERNATIONAL SYMPOSIUM ON MINE SAFETY SCIENCE AND ENGINEERING

137 / 2023-06-28 21:22:29

The Design and spray characteristics of the De-Laval supersonic pneumatic atomizer

supersonic atomization mechanism; the De-Laval supersonic pneumatic atomizing nozzle; droplet particle size; Droplet speed

In order to effectively remove respiratory dust in mining production, this article adopts supersonic pneumatic atomization dust reduction technology to solve the problem of respiratory dust pollution in mining production. Based on the supersonic pneumatic atomization mechanism, De-laval supersonic atomization nozzle is designed. And the comsol software was used to establish the particle tracking model of liquid droplet breaking in the transonic flow of compressible fluid based on the Spline cubic spline fitting parameter equation, and the spray characteristics of the De-Laval Supersonic atomizing nozzle were analyzed and studied with the experimental measurement method.The results showed that under the same aerodynamic pressure, the droplet particle velocity of the De-Laval supersonic atomizing nozzle increased first and then decreased in the near fog field;As the aerodynamic pressure continued to increase, the droplet velocity of the De-Laval supersonic aerodynamic atomizing nozzle increased, while the droplet size of the De-Laval supersonic aerodynamic atomizing nozzle decreased.At the same aerodynamic pressure, the D₁₀, D₅₀, D90, standardized mean difference (SMD), and volume average (VAD) of the De-Laval supersonic atomizing nozzle first increased, then decreased, and then increased with the increase of distance;Compared with the traditional pressure nozzle, the De-Laval supersonic atomizing nozzle effectively improved the atomizing efficiency of the nozzle. Under different pressure, the average particle size was reduced by40.64%~52.32%. In the distance of 0~140cm, the maximum particle size decreased by 38.89%. The research results provided a theoretical basis for the development of supersonic atomizing nozzles and an effective means for mine treatment of respirable dust.