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

Journal Article · · Applied Optics
DOI:https://doi.org/10.1364/AO.54.003331· OSTI ID:1235264
 [1];  [1];  [2];  [1]
  1. Iowa State Univ., Ames, IA (United States)
  2. Sandia National Lab. (SNL-CA), Livermore, CA (United States)

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.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1235264
Alternate ID(s):
OSTI ID: 1222293
Report Number(s):
SAND-2015-1719J; APOPAI; 579744
Journal Information:
Applied Optics, Vol. 54, Issue 11; ISSN 0003-6935
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (7)

Laser-induced incandescence versus photo-acoustics: implications for qualitative soot size diagnostics journal June 2019
Intrusive effects of repetitive laser pulsing in high-speed tracer-LIF measurements journal April 2017
Experimental investigation on an acoustically forced flame with simultaneous high-speed LII and stereo PIV at 20  kHz journal January 2019
4D spatiotemporal evolution of combustion intermediates in turbulent flames using burst-mode volumetric laser-induced fluorescence journal January 2017
Single-camera, single-shot, time-resolved laser-induced incandescence decay imaging journal January 2018
Burst-mode laser architecture for the generation of high-peak-power MHz-rate femtosecond pulses journal January 2019
Ultra-high-speed Pulse-burst Phase Conjugate Digital In-line Holography for Imaging Through Shock-wave Distortions conference January 2019