Campus Units

Mechanical Engineering, Chemical and Biological Engineering

Document Type

Conference Proceeding


50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

Publication Version

Published Version

Publication Date


Journal or Book Title

50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference

First Page




Conference Title

AIAA Propulsion and Energy Forum

Conference Date

July 28-30, 2014


Cleveland, OH


The spray characteristics of a liquid-liquid double swirl coaxial injector were studied using non-invasive optical, laser, and X-ray diagnostics. Phase Doppler interferometry was used to characterize droplet statistics and non-dimensional droplet parameters over a range of inlet conditions and for various fluids allowing for a study on the role of fluid properties on atomization. Based on the atomization statistics and observed trends from high-speed images, a description of breakup regimes over a range of Reynolds and Weber numbers was created. Next, X-ray computed tomography scans revealed that the spray cone was distinctively non-uniform and comprised of several pockets of increased mass concentration which varied with injection pressure. Finally, a parametric study of injector exit geometry demonstrated that spray breakup time, breakup type, and sheet stability could be controlled with exit geometry. Implications for these data on injector stability and atomization efficiency are discussed considering the desired performance characteristics of liquid-liquid rocket injectors.


This proceeding is published as Radke, Christopher D., Theodore J. Heindel, and Terrence R. Meyer. "Effect of Injector Exit Geometry on Atomization of a Liquid-Liquid Double Swirl Coaxial Injector using Non-Invasive Laser, Optical, and X-ray Techniques." In 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference, p. 3787. 2014. DOI: 10.2514/6.2014-3787. Posted with permission.


Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.



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