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Title: Investigation of sampling-probe distorted temperature fields with X-ray fluorescence spectroscopy

Abstract

Flame-sampling experiments, especially in conjunction with laminar low-pressure premixed flames, are routinely used in combustion chemistry studies to unravel the identities and quantities of key intermediates and their pathways. In many instances, however, an unambiguous interpretation of the experimental and modeling results is hampered by the uncertainties about the probe-induced, perturbed temperature profile. To overcome this limitation, two-dimensional perturbations of the temperature field caused by sampling probes with different geometries have been investigated using synchrotron-based X-ray fluorescence spectroscopy. In these experiments, which were performed at the 7-BM beamline of the Advanced Photon Source (APS) at the Argonne National Laboratory, a continuous beam of hard X-rays at 15 keV was used to excite krypton atoms that were added in a concentration of 5 vol.-% to the unburnt gas mixture and the resulting krypton fluorescence at 12.65 keV was subsequently collected. Here, the highly spatially resolved signal was converted into the local flame temperature to obtain temperature fields at various burner-probe separations as functions of the distance to the burner surface and the radial distance from the centerline. Multiple measurements were performed with different probe geometries and because of the observed impact on the temperature profiles the results clearly revealed the needmore » to specify the sampling probe design to enable quantitative and meaningful comparisons of modeling results with flame-sampled mole fraction data.« less

Authors:
 [1];  [2];  [2];  [2];  [2]
  1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1570291
Report Number(s):
SAND-2019-10055J
Journal ID: ISSN 1540-7489; 678836
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the Combustion Institute
Additional Journal Information:
Journal Volume: 37; Journal Issue: 2; Journal ID: ISSN 1540-7489
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; X-ray fluorescence; Low-pressure flame; Temperature; Probe perturbation; Speciation data

Citation Formats

Hansen, Nils, Tranter, R. S., Randazzo, J. B., Lockhart, J. P. A., and Kastengren, A. L. Investigation of sampling-probe distorted temperature fields with X-ray fluorescence spectroscopy. United States: N. p., 2018. Web. doi:10.1016/j.proci.2018.05.034.
Hansen, Nils, Tranter, R. S., Randazzo, J. B., Lockhart, J. P. A., & Kastengren, A. L. Investigation of sampling-probe distorted temperature fields with X-ray fluorescence spectroscopy. United States. doi:10.1016/j.proci.2018.05.034.
Hansen, Nils, Tranter, R. S., Randazzo, J. B., Lockhart, J. P. A., and Kastengren, A. L. Wed . "Investigation of sampling-probe distorted temperature fields with X-ray fluorescence spectroscopy". United States. doi:10.1016/j.proci.2018.05.034. https://www.osti.gov/servlets/purl/1570291.
@article{osti_1570291,
title = {Investigation of sampling-probe distorted temperature fields with X-ray fluorescence spectroscopy},
author = {Hansen, Nils and Tranter, R. S. and Randazzo, J. B. and Lockhart, J. P. A. and Kastengren, A. L.},
abstractNote = {Flame-sampling experiments, especially in conjunction with laminar low-pressure premixed flames, are routinely used in combustion chemistry studies to unravel the identities and quantities of key intermediates and their pathways. In many instances, however, an unambiguous interpretation of the experimental and modeling results is hampered by the uncertainties about the probe-induced, perturbed temperature profile. To overcome this limitation, two-dimensional perturbations of the temperature field caused by sampling probes with different geometries have been investigated using synchrotron-based X-ray fluorescence spectroscopy. In these experiments, which were performed at the 7-BM beamline of the Advanced Photon Source (APS) at the Argonne National Laboratory, a continuous beam of hard X-rays at 15 keV was used to excite krypton atoms that were added in a concentration of 5 vol.-% to the unburnt gas mixture and the resulting krypton fluorescence at 12.65 keV was subsequently collected. Here, the highly spatially resolved signal was converted into the local flame temperature to obtain temperature fields at various burner-probe separations as functions of the distance to the burner surface and the radial distance from the centerline. Multiple measurements were performed with different probe geometries and because of the observed impact on the temperature profiles the results clearly revealed the need to specify the sampling probe design to enable quantitative and meaningful comparisons of modeling results with flame-sampled mole fraction data.},
doi = {10.1016/j.proci.2018.05.034},
journal = {Proceedings of the Combustion Institute},
number = 2,
volume = 37,
place = {United States},
year = {2018},
month = {6}
}

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