Experimental Study on Spray Characteristic of Air-assist Swirl Nozzle in Confined Space

doi:10.3969/j.issn.1000-1093.2015.10.009

Abstract

Abstract: To investigate the spray characteristic of an air-assist swirl nozzle in confined space,the distributions of Sauter mean diameter (SMD) and axial velocity of droplets are measured, respectively, using laser phase Dopper analyzer (PDA). The spray parameters in atmospheric environment and confined space are compared and analyzed. The results indicate that the mean diameter of droplets is determined by liquid pressure and gas pressure. With the increase in the distance between the measuring point and the nozzle, the mean diameter of droplets increases firstly and then decreases, and the axial velocity of droplets decreases. When the liquid pressure is constant and the gas pressure improves, the mean diameter of droplets decreases and the axial velocity increases. When the gas pressure is constant and the liquid pressure improves, the mean diameter of droplets increases while the axial velocity changes slightly.

Key words: engineering thermophysics, air-assist nozzle, pressure swirl, spray, confined space

CLC Number:

V434⁺.3

LIU Kun, YU Yong-gang， ZHAO Na. Experimental Study on Spray Characteristic of Air-assist Swirl Nozzle in Confined Space[J]. Acta Armamentarii, 2015, 36(10): 1882-1887.

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