Experimental and simulation study on the influencing factors of atomization of internal mixing air atomizing nozzles
In order to study the applicability of three types of internal mixing air atomization nozzles,the atomization characteristics of the air atomization nozzles were analyzed,and the influence of structural parameters on the atomization characteristics of the nozzles was determined.A three-dimensional steady-state model was established based on the VOF two-phase flow model and Realizable k-ε turbulence model to analyze the atomization process,pressure and velocity variations within the mixing chamber of these nozzles.An atomization experimental platform was set up to study their atomization characteristics.The results indicate that the droplet size of the nozzles is negatively related to air supply pressure and positively related to water pressure.Droplet velocity shows an increasing trend with higher water and air supply pressure.The atomization of the 1st nozzle is significantly influenced by operational parameters,it can achieve an atomization angle of around 90°,a range of 4.7 m,and a minimum droplet size of 8 μm,demonstrating excellent overall atomization performance.The 2nd nozzle compresses large droplets with air,dispersing them to the sides,resulting in a spray angle of approximately 141° and a range of about 1.5 m.The 3rd nozzle concentrates the liquid phase under action of compressed air in the center,producing an atomization angle of around 20°,a range of up to 3.7 m,and a droplet velocity of approximately 28 m/s.The research results provide theoretical guidance for nozzle design and improvement of spray dust suppression system.
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