Characterization of the steady and unsteady spray structures of a liquid jet in supersonic crossflow

Dayna Obenauf,Francois Falempin,Guillermo Paniagua,James Braun,Paul Sojka,Terrence Meyer

doi:10.2218/iclass.2021.6157

Abstract

Characterization of the steady and unsteady spray structures of a liquid jet in supersonic crossflow

Highlights

The breakup of a liquid jet in a supersonic crossflow has been of interest to many researchers for over 50 years. [1,2,3] Understanding the liquid atomization process is essential for predicting the appropriate time and length scales of the primary and secondary atomization processes to better model fuel and air mixing in combustion processes
Numerous groups have attempted experimental measurements and computation modelling of the liquid jet breakup process when injected into a supersonic crossflow
Liquid ethanol was injected into a supersonic crossflow through a 1 mm diameter hole in the top plate of the test section

Summary

Introduction

The breakup of a liquid jet in a supersonic crossflow has been of interest to many researchers for over 50 years. [1,2,3] Understanding the liquid atomization process is essential for predicting the appropriate time and length scales of the primary and secondary atomization processes to better model fuel and air mixing in combustion processes. Numerous groups have attempted experimental measurements and computation modelling of the liquid jet breakup process when injected into a supersonic crossflow. Many more variable that have potential to affect jet breakup have yet to be evaluated, including test section static pressure, multiple injector sizes to compare the effect of liquid mass flow rate, and measurement of the spray at large distances downstream of injection. This present study attempts to fill in some of these gaps by implementing a variety of measurement techniques to both qualitatively and quantitatively describe the spray and surrounding air flow. The liquid temperature was around 290K, the gas temperature was around 290K at the onset of the experiment and decreased due to expansion within the high-pressure storage tank

Backlit Imaging

Conclusions

Findings

Momentum Flux Ratio