Abstract:

Multiphase flows (liquid/gas) in propulsion-relevant sprays, such as doublet and triplet impinging jet sprays popular for fuel delivery in liquid rocket engines, can have very high optical depths. These flows are typically hard to probe with visible laser diagnostics due to the presence of multiple scattering, paving the way for X-ray based diagnostics to instead be utilized. This talk will cover the specific developments made in the current Ph.D. thesis work for the quantitative characterization of key flow parameters in liquid sprays. Material characterization using synchrotron-based X-ray scattering measurements for spatially resolved mapping of temperature and mixture fraction distributions will be shown in sprays of single- and multi-component liquid fuels. Temporally resolved tomography (“4D”) measurements using a modular table-top tube source X-ray radiography setup will also be briefly discussed for mass distribution characterizations of the near-injector region of similar spray geometries. The data analysis techniques covered include linear regression modeling, computer vision and 3D data visualization, and non-linear optimization. The advancements made in this work will lead to improved experimental inputs for modeling of multiphase flows.

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