Investigation of droplet aerobreakup using non-intrusive diagnostics and numerical simulations

Document Type

Conference Proceeding

Publication Date

1-1-2023

Abstract

Applications of liquid jets and sprays in a crossflow can widely range from aerospace combustion to heavy-duty diesel after-treatment systems. While computational fluid dynamics are frequently used for modeling such sprays, additional experimental data is always needed for continued model validation and development. We present time-resolved X-ray radiography and high-speed phase contrast imaging measurements of a pressure-swirl after-treatment injector in a crossflow. The projected density distributions at two different crossflow velocities show an initial transient spray behavior as the injector opens, as well as a steady-state spray structure. Comparisons in the spray density between the two flow velocities are highlighted. The phase contrast images show qualitative spray characteristics as the liquid cone structure sheds ligaments and droplets. The images also provide quantitative metrics on the spray cone structure that can be compared to the radiography data. These measurements also provide quantitative data for spray predictive model development.

Publication Source (Journal or Book title)

AIAA SciTech Forum and Exposition, 2023

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