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Title: High-resolution X-ray tomography of Engine Combustion Network diesel injectors

Abstract

The flow inside direct injection diesel nozzles is strongly influenced by the local geometry. Deviations from the design geometry and nonuniformities along the fuel’s flow path can alter the expected spray behavior. The influence of small– scale variations in the internal geometry is not well understood due to a lack of data available to experimentalists and modelers that resolve such features. Additionally, manufacturing repeatability restricts the universality of experimental measurements. To address the need for more accurate geometry measurements that also quantify the error bounds on manufacturing variability, the 7–BM beamline of the Advanced Photon Source at Argonne National Laboratory has been customized to obtain high–resolution x–ray tomography of injection nozzles. In this paper, we present results for several single and multi–hole diesel injectors provided by the Engine Combustion Network. The imaging setup was optimized to measure dense metallic samples at high signal–to–noise ratio with a spatial resolution of 1.17 µm using projection imaging. To improve contrast, multiple images were recorded at each rotation angle. Phase shifting effects, which amplify the uncertainty in locating nozzle boundaries, were minimized by reducing the propagation distance of the x–rays between the nozzle and detector. Such improvements to the imaging technique enabled the nozzlemore » hole diameter to be measured with an accuracy of 1.8 µm. In addition to profiling nozzle features such as hole inlet and outlet diameters, eccentricity, length, and drill angle, the high spatial resolution allows the nozzle hole inlet corner radius to be azimuthally resolved. For the sample set under consideration, these new measurements reveal that non–hydroground injectors do not have a characteristic mean inlet corner radius, but rather a distribution of radii which typically vary by more than a factor of two. An azimuthally–varying radius of curvature at the hole inlet is expected to result in highly asymmetric cavitation. Finally, skeletal wireframe models of the nozzle hole geometries suitable for CFD mesh generation have been developed, in addition to full three–dimensional isosurfaces; these data have been made available online for public use.« less

Authors:
 [1];  [2];  [3];  [1];  [1];  [1]
  1. Energy Systems Division, Argonne National Laboratory, Lemont, IL, USA
  2. Energy Systems Division, Argonne National Laboratory, Lemont, IL, USA, Laboratory for Turbulence Research in Aerospace and Combustion, Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC, Australia
  3. X-ray Science Division, Argonne National Laboratory, Lemont, IL, USA
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V)
OSTI Identifier:
1479583
Alternate Identifier(s):
OSTI ID: 1487202
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Published Article
Journal Name:
International Journal of Engine Research
Additional Journal Information:
Journal Name: International Journal of Engine Research Journal Volume: 19 Journal Issue: 9; Journal ID: ISSN 1468-0874
Publisher:
SAGE
Country of Publication:
United Kingdom
Language:
English
Subject:
42 ENGINEERING; ECN; diesel; direct injection; fuel spray; geometry; x-ray tomography

Citation Formats

Matusik, Katarzyna E., Duke, Daniel J., Kastengren, Alan L., Sovis, Nicholas, Swantek, Andrew B., and Powell, Christopher F. High-resolution X-ray tomography of Engine Combustion Network diesel injectors. United Kingdom: N. p., 2017. Web. doi:10.1177/1468087417736985.
Matusik, Katarzyna E., Duke, Daniel J., Kastengren, Alan L., Sovis, Nicholas, Swantek, Andrew B., & Powell, Christopher F. High-resolution X-ray tomography of Engine Combustion Network diesel injectors. United Kingdom. doi:10.1177/1468087417736985.
Matusik, Katarzyna E., Duke, Daniel J., Kastengren, Alan L., Sovis, Nicholas, Swantek, Andrew B., and Powell, Christopher F. Tue . "High-resolution X-ray tomography of Engine Combustion Network diesel injectors". United Kingdom. doi:10.1177/1468087417736985.
@article{osti_1479583,
title = {High-resolution X-ray tomography of Engine Combustion Network diesel injectors},
author = {Matusik, Katarzyna E. and Duke, Daniel J. and Kastengren, Alan L. and Sovis, Nicholas and Swantek, Andrew B. and Powell, Christopher F.},
abstractNote = {The flow inside direct injection diesel nozzles is strongly influenced by the local geometry. Deviations from the design geometry and nonuniformities along the fuel’s flow path can alter the expected spray behavior. The influence of small– scale variations in the internal geometry is not well understood due to a lack of data available to experimentalists and modelers that resolve such features. Additionally, manufacturing repeatability restricts the universality of experimental measurements. To address the need for more accurate geometry measurements that also quantify the error bounds on manufacturing variability, the 7–BM beamline of the Advanced Photon Source at Argonne National Laboratory has been customized to obtain high–resolution x–ray tomography of injection nozzles. In this paper, we present results for several single and multi–hole diesel injectors provided by the Engine Combustion Network. The imaging setup was optimized to measure dense metallic samples at high signal–to–noise ratio with a spatial resolution of 1.17 µm using projection imaging. To improve contrast, multiple images were recorded at each rotation angle. Phase shifting effects, which amplify the uncertainty in locating nozzle boundaries, were minimized by reducing the propagation distance of the x–rays between the nozzle and detector. Such improvements to the imaging technique enabled the nozzle hole diameter to be measured with an accuracy of 1.8 µm. In addition to profiling nozzle features such as hole inlet and outlet diameters, eccentricity, length, and drill angle, the high spatial resolution allows the nozzle hole inlet corner radius to be azimuthally resolved. For the sample set under consideration, these new measurements reveal that non–hydroground injectors do not have a characteristic mean inlet corner radius, but rather a distribution of radii which typically vary by more than a factor of two. An azimuthally–varying radius of curvature at the hole inlet is expected to result in highly asymmetric cavitation. Finally, skeletal wireframe models of the nozzle hole geometries suitable for CFD mesh generation have been developed, in addition to full three–dimensional isosurfaces; these data have been made available online for public use.},
doi = {10.1177/1468087417736985},
journal = {International Journal of Engine Research},
number = 9,
volume = 19,
place = {United Kingdom},
year = {2017},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1177/1468087417736985

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Cited by: 4 works
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