Abstract
Studies on pressure-swirl atomizers have mainly focused on pressure-swirl atomizers with tangential input, however research on pressure-swirl atomizers with spiral path have been very limited and only the effect of some key parameters on the main properties of spray has been studied. In this research, using experimental methods and numerical details, detailed investigation has been carried out on pressure-swirl atomizers with spiral paths to better understand the effects of changes in the inlet pressure and Reynolds number on a variety of parameters of spray. In summary, the results indicated that by increasing the inlet pressure from 2.6 bar to 9.3 bar, the discharge coefficient, fluid film thickness and droplet diameters in the first and second phases of atomization decreased by 56.52, 34.48, 41.51 and 45.61%, respectively. In addition, in general, by increasing the Reynolds number from 0.21 (* 104) to 0.69 (* 104), the fluid’s film thickness and the average diameter of the droplets in the first and second phases of breakup are reduced by 22.58, 51.24 and 35.42%, respectively.It is important to note that the numerical results are in good agreement with the experimental data.
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