| Swirl atomizer is one of the best devices atomizing liquid. Compared to pneumatic atomizer, it is widely used in petroleum industry, chemical engineering, food, environment and fire protecting industries and so on. Flow state in swirl atomizer is very complicated and it is so difficult to calculate internal flow field accurately. Now atomizer design is based upon diagram and empirical formula which isn't enough accurate and their application scope is small.According to classical maximum flux principle theory of Abramovich, who is a scientist of Soviet Russia, an atomizer was designed and 7 were manufactured following the same drawing.A numerical simulation has been conducted for 3-D flow field in swirl atomizer. First, the physical model and mathematic model of the flow field were built, and a boundary condition was confirmed according to real state of internal flow field. It was obtained that the structure of the flow field consists of liquid film and gas core, the gas-liquid interface was distinguished by the two-phase mixture fraction. The effect of flux on the depth and radius of gas core was got. Analyzing drag character and its influencing factor was carried out.In experimental research, flux character were studied. The change rule of pressure drop of atomizer was investigated along with flux in experiment. The approximated relationship between flow coefficient and pressure drop was figured out by least squares techniques. In the same time, comparison of the numerical result and experimental result was conducted, getting the conclusion that CFD technique could be assisted for calculating flow coefficient. Analyzed effect of atomizer character on process quality and concluded the change rule of spray angle along with pressure drop. |
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