# title
Rayleigh Imaging from CO2 Clusters in an Underexpanded Jet

# abstract
View Video Presentation: https://doi.org/10.2514/6.2021-3115.vid CO2 condensation, growth, and evaporation in an underexpanded jet flow are experimentally and theoretically investigated with pure CO2 and CO2-air mixtures. Single-shot, high-repetition-rate, two-dimensional Rayleigh scattering imaging has been demonstrated to visualize the supersonic flow structure and provide quantitative measurements of CO2 cluster growth and evaporation in the flow region. A quasi-one-dimensional expanding flow model is applied to predict the evolution of CO2 cluster, including nucleation, growth, and evaporation in the supersonic flow, and the resulting strength of light scattering. The quantitative model prediction is directly compared with experimental data showing reasonable agreement. The entire work provides a proof-of-principle demonstration of signal prediction for CO2 cluster scattering measurements.

# publisher.label
American Institute of Aeronautics and Astronautics (AIAA)

# keywords[]
4012 Fluid Mechanics And Thermal Engineering