Airblast atomization at conditions of low air velocity
The process of prefilming airblast atomization under conditions of reduced air velocity is examined. Spray quality is determined by a series of measurements of drop size distribution and mean drop size. A two-dimensional atomizer which produces a flat liquid sheet of variable thickness between two coflowing nitrogen gas streams is used. The results confirm that spray quality improves when air velocity and air/liquid mass flow ratio are increased and liquid surface tension and viscosity are decreased. It is suggested that a threshold of relative velocity exists below which atomization is not possible for a given set of conditions. The dependence of the spray Sauter mean diameter on initial liquid film thickness is weak for the system studied. It is suggested that this is because the airstreams impinge on the liquid sheet at a 30 deg angle and extrude the sheet between the two colliding streams, thus nullifying the influence of the initial sheet thickness. 11 references.
- OSTI ID:
- 6101366
- Report Number(s):
- AIAA-Paper-89-0217; CONF-890123-
- Country of Publication:
- United States
- Language:
- English
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