Abstract
To examine the jet mixing in air-blast twin fluid atomization, the sonic and supersonic air jet developments have been exclusively visualized using the Rayleigh scattering principle and the development of liquid spray has been separately visualized using the Mie scattering principle from spray drops. A comparative study of images of the spray and the air jet has been conducted in an attempt to study the jet-spray interactions. Both under-expanded sonic and over-expanded supersonic air jets have been examined to determine their effects on atomization. After a successful implementation of the Rayleigh/Mie scattering system, the visualization experiment has been repeated for a wide range of the stagnation pressure to cover the subsonic, sonic, and supersonic jets. For the Mie scattering visualization, the injected water flow rate has been also varied to observe different spray development behaviors for different airto-water ratios (AWR). Digitized images of the recordings have been analyzed to identify the mixing/no-mixing zones between the jet and ambient, the shear interaction between the jet and liquid, and the overall spray development depending upon the jet Mach number.
Kim, Tae-Kyun (1996). Investigation of sonic/subsonic air-blast atomization using Rayleigh- and Mie-scattering visualization techniques. Master's thesis, Texas A&M University. Available electronically from
https : / /hdl .handle .net /1969 .1 /ETD -TAMU -1996 -THESIS -K5676.