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Title: Effects of repetitive pulsing on multi-kHz planar laser-induced incandescence imaging in laminar and turbulent flames

Abstract

Planar laser-induced incandescence (LII) imaging is reported at repetition rates up to 100 kHz using a burst-mode laser system to enable studies of soot formation dynamics in highly turbulent flames. Furthermore, to quantify the accuracy and uncertainty of relative soot volume fraction measurements, the temporal evolution of the LII field in laminar and turbulent flames is examined at various laser operating conditions. Under high-speed repetitive probing, it is found that LII signals are sensitive to changes in soot physical characteristics when operating at high laser fluences within the soot vaporization regime. For these laser conditions, strong planar LII signals are observed at measurement rates up to 100 kHz but are primarily useful for qualitative tracking of soot structure dynamics. However, LII signals collected at lower fluences allow sequential planar measurements of the relative soot volume fraction with a sufficient signal-to-noise ratio at repetition rates of 10–50 kHz. Finally, guidelines for identifying and avoiding the onset of repetitive probe effects in the LII signals are discussed, along with other potential sources of measurement error and uncertainty.

Authors:
 [1];  [1];  [2];  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1235264
Alternate Identifier(s):
OSTI ID: 1222293
Report Number(s):
SAND-2015-1719J
Journal ID: ISSN 0003-6935; APOPAI; 579744
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Applied Optics
Additional Journal Information:
Journal Volume: 54; Journal Issue: 11; Journal ID: ISSN 0003-6935
Publisher:
Optical Society of America (OSA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

Michael, James B., Venkateswaran, Prabhakar, Shaddix, Christopher R., and Meyer, Terrence R. Effects of repetitive pulsing on multi-kHz planar laser-induced incandescence imaging in laminar and turbulent flames. United States: N. p., 2015. Web. doi:10.1364/AO.54.003331.
Michael, James B., Venkateswaran, Prabhakar, Shaddix, Christopher R., & Meyer, Terrence R. Effects of repetitive pulsing on multi-kHz planar laser-induced incandescence imaging in laminar and turbulent flames. United States. https://doi.org/10.1364/AO.54.003331
Michael, James B., Venkateswaran, Prabhakar, Shaddix, Christopher R., and Meyer, Terrence R. Wed . "Effects of repetitive pulsing on multi-kHz planar laser-induced incandescence imaging in laminar and turbulent flames". United States. https://doi.org/10.1364/AO.54.003331. https://www.osti.gov/servlets/purl/1235264.
@article{osti_1235264,
title = {Effects of repetitive pulsing on multi-kHz planar laser-induced incandescence imaging in laminar and turbulent flames},
author = {Michael, James B. and Venkateswaran, Prabhakar and Shaddix, Christopher R. and Meyer, Terrence R.},
abstractNote = {Planar laser-induced incandescence (LII) imaging is reported at repetition rates up to 100 kHz using a burst-mode laser system to enable studies of soot formation dynamics in highly turbulent flames. Furthermore, to quantify the accuracy and uncertainty of relative soot volume fraction measurements, the temporal evolution of the LII field in laminar and turbulent flames is examined at various laser operating conditions. Under high-speed repetitive probing, it is found that LII signals are sensitive to changes in soot physical characteristics when operating at high laser fluences within the soot vaporization regime. For these laser conditions, strong planar LII signals are observed at measurement rates up to 100 kHz but are primarily useful for qualitative tracking of soot structure dynamics. However, LII signals collected at lower fluences allow sequential planar measurements of the relative soot volume fraction with a sufficient signal-to-noise ratio at repetition rates of 10–50 kHz. Finally, guidelines for identifying and avoiding the onset of repetitive probe effects in the LII signals are discussed, along with other potential sources of measurement error and uncertainty.},
doi = {10.1364/AO.54.003331},
journal = {Applied Optics},
number = 11,
volume = 54,
place = {United States},
year = {Wed Apr 08 00:00:00 EDT 2015},
month = {Wed Apr 08 00:00:00 EDT 2015}
}

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Cited by: 19 works
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Works referencing / citing this record:

Laser-induced incandescence versus photo-acoustics: implications for qualitative soot size diagnostics
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Intrusive effects of repetitive laser pulsing in high-speed tracer-LIF measurements
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