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Resonant Laser Techniques for Combustion and Flow Diagnostics

Fritzon, Rolf LU (1998) In Lund reports on combustion physics 38.
Abstract
This thesis presents results from two areas of research. Firstly, the resonant coherent laser techniques polarization spectroscopy (PS), degenerate four-wave mixing (DFWM) and stimulated emission (SE) have been developed in the general field of combustion diagnostics. Secondly, laser induced fluorescence (LIF) has been developed and applied for the visualization of mixture fractions in turbulent nonreacting flows.



PS was developed for instantaneous two-dimensional imaging of minor species in flames, the technique being demonstrated on OH and NO. Various aspects of imaging and of detection in general were investigated. Two-photon induced PS was demonstrated for the detection of NH3, CO and N2 molecules. LIF was monitored... (More)
This thesis presents results from two areas of research. Firstly, the resonant coherent laser techniques polarization spectroscopy (PS), degenerate four-wave mixing (DFWM) and stimulated emission (SE) have been developed in the general field of combustion diagnostics. Secondly, laser induced fluorescence (LIF) has been developed and applied for the visualization of mixture fractions in turbulent nonreacting flows.



PS was developed for instantaneous two-dimensional imaging of minor species in flames, the technique being demonstrated on OH and NO. Various aspects of imaging and of detection in general were investigated. Two-photon induced PS was demonstrated for the detection of NH3, CO and N2 molecules. LIF was monitored simultaneously to allow a quantitative comparison between the techniques. Furthermore, PS and DFWM were developed for instantaneous two-dimensional OH temperature imaging. Through a novel experimental approach based on the use of a dual-wavelength dye laser and a diffraction grating the temperature imaging measurements were performed using only one laser and one CCD camera. A comparison between the two techniques was made. SE was through a crossed-beam arrangement developed for spatially resolved detection of flame species.



Two-dimensional LIF was developed and applied for measuring mixture fractions in the shear layer between two co-flowing turbulent gaseous jets. The technique was further applied in a study of the mixing of a turbulent water jet impinging orthogonally onto a flat surface. Average concentration fields in the center-plane of the jet was compared with results from large eddy simulations and with data from literature. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Prof Taran, J.P.E., Office National d'Études et de Recherches Aérospatiales, France
organization
publishing date
type
Thesis
publication status
published
subject
keywords
species, laser diagnostic techniques, temperature imaging, polarization spectroscopy, stimulated emission, DFWM, Fysik, Physics, turbulent mixing, LIF, Fysicumarkivet A:1998:Fritzon
in
Lund reports on combustion physics
volume
38
pages
230 pages
publisher
Division of Combustion Physics, Department of Physics, Lund University
defense location
Dept. of Physics, Professorsg. 1, Hörsal B
defense date
1998-05-29 10:15
external identifiers
  • other:ISRN: LUTFD2/TFCP--38--SE
ISSN
1102-8718
ISBN
91-628-2957-2
language
English
LU publication?
yes
id
2e221596-bd78-4c99-8250-fde3496ad744 (old id 38789)
date added to LUP
2007-06-21 10:44:44
date last changed
2016-09-19 08:44:52
@phdthesis{2e221596-bd78-4c99-8250-fde3496ad744,
  abstract     = {This thesis presents results from two areas of research. Firstly, the resonant coherent laser techniques polarization spectroscopy (PS), degenerate four-wave mixing (DFWM) and stimulated emission (SE) have been developed in the general field of combustion diagnostics. Secondly, laser induced fluorescence (LIF) has been developed and applied for the visualization of mixture fractions in turbulent nonreacting flows.<br/><br>
<br/><br>
PS was developed for instantaneous two-dimensional imaging of minor species in flames, the technique being demonstrated on OH and NO. Various aspects of imaging and of detection in general were investigated. Two-photon induced PS was demonstrated for the detection of NH3, CO and N2 molecules. LIF was monitored simultaneously to allow a quantitative comparison between the techniques. Furthermore, PS and DFWM were developed for instantaneous two-dimensional OH temperature imaging. Through a novel experimental approach based on the use of a dual-wavelength dye laser and a diffraction grating the temperature imaging measurements were performed using only one laser and one CCD camera. A comparison between the two techniques was made. SE was through a crossed-beam arrangement developed for spatially resolved detection of flame species.<br/><br>
<br/><br>
Two-dimensional LIF was developed and applied for measuring mixture fractions in the shear layer between two co-flowing turbulent gaseous jets. The technique was further applied in a study of the mixing of a turbulent water jet impinging orthogonally onto a flat surface. Average concentration fields in the center-plane of the jet was compared with results from large eddy simulations and with data from literature.},
  author       = {Fritzon, Rolf},
  isbn         = {91-628-2957-2},
  issn         = {1102-8718},
  keyword      = {species,laser diagnostic techniques,temperature imaging,polarization spectroscopy,stimulated emission,DFWM,Fysik,Physics,turbulent mixing,LIF,Fysicumarkivet A:1998:Fritzon},
  language     = {eng},
  pages        = {230},
  publisher    = {Division of Combustion Physics, Department of Physics, Lund University},
  school       = {Lund University},
  series       = {Lund reports on combustion physics},
  title        = {Resonant Laser Techniques for Combustion and Flow Diagnostics},
  volume       = {38},
  year         = {1998},
}