GEOMETRIC EFFECTS ON SPRAY CONE ANGLE FOR PLAIN-ORIFICE ATOMIZERS

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Abstract
The effects of nozzle geometry, flow conditions, and manufacturing imperfections on spray cone angle are examined using 40 different plain-orifice atomizers. The length/diameter ratios of the discharge orifices are varied from 2 to 5 while maintaining the orifice diameter constant at 0.254 mm. A universal calibrating fluid, Viscor 1487-C, is injected at pressures up to 109 MPa into air at normal atmospheric pressure. Analysis of the experimental data indicates that the spray cone angle is very dependent on the shape and condition of the orifice inlet. Sharp-edged inlets, rough-edged inlets, and rounded inlets all exhibit different characteristics with regard to the effects of length/diameter ratio and injection pressure on the measure cone angle.

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