In this paper, the internal flow field and external spray characteristics of the\nspray gun were simulated and analyzed by establishing a coupling model of\nthe gas-liquid two-phase flow of the spray gun. The spray particle size and\ncone angle under different gas path pressures were mainly studied. The calculation\nresults showed that the spray particle size distribution had a large\nspan, but the overall spray particle size was small. The liquid flow and the air\npressure had a little influence on the spray cone angle. The spray SMD was\ntested by a three-dimensional particle dynamic analyzer (PDA), and the spray\ncone angle was photographed with a high-speed camera. The test data was\nbasically consistent with the simulation results. The experimental results\nshowed that the model can accurately simulate the internal flow field of the\nspray gun and the atomization process of urea. It can be used to analyze the\ncharacteristics of urea spray and provide a theoretical basis for the optimal\ndesign of urea spray gun.
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