Abstract
Measurements of the mean drop size (Sauter mean diameter) produced by a plain-jet airblast atomizer were carried out using the well-established light-scattering technique. Specially prepared liquids were employed to distinguish between the separate effects on SMD of viscosity, surface tension, and density. Atomizing air velocities of up to 180 m/s were used in order to cover the range of interest for the gas turbine. The effect of atomizer size on SMD was studied using several geometrically similar systems in which the fuel injection orifices varied between 0.397 and 1.588 mm in diameter. The results of the investigation generally confirmed those obtained in previous studies in regard to the effects of liquid properties, air velocity, and air/liquid ratio on atomization quality. The effect of fuel orifice diameter D was found to be quite small, except for liquids of high viscosity, where SMD varied roughly in proportion with Z>°-. Analysis of the experimental data revealed that under comparable operating conditions the performance of the plain-jet airblast atomizer is inferior to that of the widely used thin-sheet airblast atomizer.
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