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Flame propagation visualization in a spark-ignition engine using laser-induced fluorescence of cool-flame species

Bladh, Henrik LU ; Brackmann, C; Dahlander, P; Denbratt, I and Bengtsson, Per-Erik LU (2005) In Measurement Science & Technology 16(5). p.1083-1091
Abstract
The flame propagation in a spark-ignition engine has been studied using laser-induced fluorescence (LIF) of species formed during the first ignition stage of hydrocarbon combustion. The detected two-dimensional LIF images showed the distribution of unburned regions. For the excitation, two Nd:YAG lasers operating at 355 mn were used for two consecutive measurements within the same engine cycle with adjustable time separation between the pulses. Two ICCD cameras that were synchronized to each of the laser pulses recorded pairs of fluorescence images, i.e. the movement of the flame front could be tracked. It is well known that formaldehyde is excited using a wavelength of 355 nm and a spectral signature of this species was also identified in... (More)
The flame propagation in a spark-ignition engine has been studied using laser-induced fluorescence (LIF) of species formed during the first ignition stage of hydrocarbon combustion. The detected two-dimensional LIF images showed the distribution of unburned regions. For the excitation, two Nd:YAG lasers operating at 355 mn were used for two consecutive measurements within the same engine cycle with adjustable time separation between the pulses. Two ICCD cameras that were synchronized to each of the laser pulses recorded pairs of fluorescence images, i.e. the movement of the flame front could be tracked. It is well known that formaldehyde is excited using a wavelength of 355 nm and a spectral signature of this species was also identified in engine LIF spectra. Programme routines were developed and used for evaluation of the flame propagation velocity from the fluorescence images. This paper presents the potential and the characteristics of the experimental technique as well as the evaluation procedure. The measurements of cool-flame intermediates have also been compared with measurements of fuel-tracer as an indicator of unburned fuel-air mixture. A good agreement between position and shape of the signal areas was obtained at crank angles where both fluorescence signal from cool-flame species excited at 355 nm and added 3-pentanone excited at 266 nm could be detected. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
combustion diagnostics, spark-ignition, engine, flame propagation, laser-induced fluorescence
in
Measurement Science & Technology
volume
16
issue
5
pages
1083 - 1091
publisher
IOP Publishing
external identifiers
  • wos:000229468800007
  • scopus:24144477571
ISSN
0957-0233
DOI
10.1088/0957-0233/16/5/006
language
English
LU publication?
yes
id
b6f30f62-4b3e-4869-a13e-85858319b9a9 (old id 238685)
date added to LUP
2007-08-13 12:22:46
date last changed
2017-02-19 04:18:00
@article{b6f30f62-4b3e-4869-a13e-85858319b9a9,
  abstract     = {The flame propagation in a spark-ignition engine has been studied using laser-induced fluorescence (LIF) of species formed during the first ignition stage of hydrocarbon combustion. The detected two-dimensional LIF images showed the distribution of unburned regions. For the excitation, two Nd:YAG lasers operating at 355 mn were used for two consecutive measurements within the same engine cycle with adjustable time separation between the pulses. Two ICCD cameras that were synchronized to each of the laser pulses recorded pairs of fluorescence images, i.e. the movement of the flame front could be tracked. It is well known that formaldehyde is excited using a wavelength of 355 nm and a spectral signature of this species was also identified in engine LIF spectra. Programme routines were developed and used for evaluation of the flame propagation velocity from the fluorescence images. This paper presents the potential and the characteristics of the experimental technique as well as the evaluation procedure. The measurements of cool-flame intermediates have also been compared with measurements of fuel-tracer as an indicator of unburned fuel-air mixture. A good agreement between position and shape of the signal areas was obtained at crank angles where both fluorescence signal from cool-flame species excited at 355 nm and added 3-pentanone excited at 266 nm could be detected.},
  author       = {Bladh, Henrik and Brackmann, C and Dahlander, P and Denbratt, I and Bengtsson, Per-Erik},
  issn         = {0957-0233},
  keyword      = {combustion diagnostics,spark-ignition,engine,flame propagation,laser-induced fluorescence},
  language     = {eng},
  number       = {5},
  pages        = {1083--1091},
  publisher    = {IOP Publishing},
  series       = {Measurement Science & Technology},
  title        = {Flame propagation visualization in a spark-ignition engine using laser-induced fluorescence of cool-flame species},
  url          = {http://dx.doi.org/10.1088/0957-0233/16/5/006},
  volume       = {16},
  year         = {2005},
}