scholarly journals X-ray phase contrast and absorption imaging for the quantification of transient cavitation in high-speed nozzle flows

2021 ◽  
Vol 33 (3) ◽  
pp. 032102
Author(s):  
I. K. Karathanassis ◽  
M. Heidari-Koochi ◽  
Q. Zhang ◽  
J. Hwang ◽  
P. Koukouvinis ◽  
...  
Keyword(s):  
High Speed ◽  
Phase Contrast ◽  
X Ray ◽  
Absorption Imaging ◽  
Nozzle Flows

X-Ray Phase Contrast Imaging of Liquid Film and Spray Development Inside an Aircraft Engine Swirler

2019 ◽  
Vol 141 (12) ◽  
Author(s):  
Brandon A. Sforzo ◽  
Alan L. Kastengren ◽  
Katarzyna E. Matusik ◽  
Felipe Gomez del Campo ◽  
Christopher F. Powell
Keyword(s):  
Liquid Film ◽  
High Speed ◽  
Phase Contrast ◽  
Air Flow ◽  
High Energy ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
Spray Cone ◽  
Validation Data ◽  
X Ray

Abstract Modern aircraft engines combine liquid fuel and air using an intricate flow device with many fuel and air flow passages. To date, the process by which the fuel atomizes within this swirler set has not been examined directly due to optical access limitations. In this work, high-speed X-ray phase-contrast imaging of a liquid spray inside a gas turbine engine swirler geometry is presented. Measurements were carried out at the 7-BM beamline of the Advanced Photon Source at Argonne National Laboratory using the high-energy broadband X-ray beam. The synchrotron X-ray source provides the necessary photon energy and flux to capture time-resolved fluid phenomena within the confines of the relevant geometry while liquid and air are flowing. Spray nozzle hardware and geometries were provided by the National Jet Fuels Combustion Program (NJFCP), allowing for characterization of the spray using a commercially relevant configuration. Modified swirlers were three-dimensional printed with acrylic to improve imaging access while maintaining influential internal features. Water was used as a surrogate fluid for these studies to demonstrate the visualization capabilities. The experiments were conducted at atmospheric exit pressure conditions with a pressure drop of 6% across the swirler. High-speed imaging of the pilot spray cone revealed sheet breakup several millimeters downstream of the orifice exit, upon interaction with the radial assist air flow. These droplets and ligaments were observed to impinge on the inner filming surface of the swirler and flow toward the exit while developing a tangential flow. Under these conditions, the liquid film grows up to several hundred microns in thickness on the filming surface, and subsequently forms ligaments up to several millimeters in length before breaking up. This work demonstrates the capability of X-ray diagnostics in visualizing liquid flows within solid geometries of technical relevance. Furthermore, the spatial quantification of filming flows and liquid interaction with the swirler air provides validation data for modeling of the multiphase flows and surface interactions within the swirler.

High speed synchrotron x-ray phase contrast imaging of dynamic material response to split Hopkinson bar loading

2013 ◽  
Vol 84 (2) ◽  
pp. 025102 ◽  
Author(s):  
M. Hudspeth ◽  
B. Claus ◽  
S. Dubelman ◽  
J. Black ◽  
A. Mondal ◽  
...  
Keyword(s):  
High Speed ◽  
Phase Contrast ◽  
Hopkinson Bar ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
Material Response ◽  
X Ray ◽  
Split Hopkinson Bar ◽  
Split Hopkinson

scholarly journals In situ observation of fracture processes in high-strength concretes and limestone using high-speed X-ray phase-contrast imaging

2017 ◽  
Vol 375 (2085) ◽  
pp. 20160178 ◽  
Author(s):  
Niranjan D. Parab ◽  
Zherui Guo ◽  
Matthew Hudspeth ◽  
Benjamin Claus ◽  
Boon Him Lim ◽  
...  
Keyword(s):  
Dynamic Loading ◽  
High Speed ◽  
Phase Contrast ◽  
High Strength ◽  
Phase Contrast Imaging ◽  
In Situ Observation ◽  
Contrast Imaging ◽  
X Ray ◽  
Reactive Powder

The mechanical properties and fracture mechanisms of geomaterials and construction materials such as concrete are reported to be dependent on the loading rates. However, the in situ cracking inside such specimens cannot be visualized using traditional optical imaging methods since the materials are opaque. In this study, the in situ sub-surface failure/damage mechanisms in Cor-Tuf (a reactive powder concrete), a high-strength concrete (HSC) and Indiana limestone under dynamic loading were investigated using high-speed synchrotron X-ray phase-contrast imaging. Dynamic compressive loading was applied using a modified Kolsky bar and fracture images were recorded using a synchronized high-speed synchrotron X-ray imaging set-up. Three-dimensional synchrotron X-ray tomography was also performed to record the microstructure of the specimens before dynamic loading. In the Cor-Tuf and HSC specimens, two different modes of cracking were observed: straight cracking or angular cracking with respect to the direction of loading. In limestone, cracks followed the grain boundaries and voids, ultimately fracturing the specimen. Cracks in HSC were more tortuous than the cracks in Cor-Tuf specimens. The effects of the microstructure on the observed cracking behaviour are discussed. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

scholarly journals High speed X-ray phase contrast imaging of energetic composites under dynamic compression

2016 ◽  
Vol 109 (13) ◽  
pp. 131903 ◽  
Author(s):  
Niranjan D. Parab ◽  
Zane A. Roberts ◽  
Michael H. Harr ◽  
Jesus O. Mares ◽  
Alex D. Casey ◽  
...  
Keyword(s):  
High Speed ◽  
Phase Contrast ◽  
Dynamic Compression ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Energetic Composites

scholarly journals Real-time damage characterization for GFRCs using high-speed synchrotron X-ray phase contrast imaging

2021 ◽  
Vol 207 ◽  
pp. 108565
Author(s):  
Jinling Gao ◽  
Nesredin Kedir ◽  
Cody D. Kirk ◽  
Julio Hernandez ◽  
Junyu Wang ◽  
...  
Keyword(s):  
Real Time ◽  
High Speed ◽  
Phase Contrast ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Damage Characterization

Microstructural transformations and kinetics of high-temperature heterogeneous gasless reactions by high-speed x-ray phase-contrast imaging

2009 ◽  
Vol 80 (22) ◽  
Author(s):  
Robert V. Reeves ◽  
Jeremiah D. E. White ◽  
Eric M. Dufresne ◽  
Kamel Fezzaa ◽  
Steven F. Son ◽  
...  
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Phase Contrast ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Kinetics Of

High-speed synchrotron X-ray phase contrast imaging for analysis of low-Z composite microstructure

2012 ◽  
Vol 43 (6) ◽  
pp. 885-892 ◽  
Author(s):  
J.D. Yeager ◽  
S.N. Luo ◽  
B.J. Jensen ◽  
K. Fezzaa ◽  
D.S. Montgomery ◽  
...  
Keyword(s):  
High Speed ◽  
Phase Contrast ◽  
Phase Contrast Imaging ◽  
Contrast Imaging ◽  
X Ray ◽  
Composite Microstructure
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