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Thermometry Using Laser-Induced Emission from Thermographic Phosphors: Development and Applications in Combustion

Omrane, Alaa LU (2005)
Abstract
Temperature is a fundamental thermodynamic parameter used to describe physical, chemical and biological processes. Much effort is made to measure temperature accurately in a wide variety of applications, making temperature one of the most extensively measured parameters. In combustion as in many other applications, temperature plays a substantial role in helping to maintain an efficient and clean environment. Being able to measure temperature accurately in combustion and in fire-related applications is important for giving a better understanding of heat transfer phenomena and improving existing models.



A method based on the spectroscopy of inorganic luminescent materials is described here and is employed in experiments... (More)
Temperature is a fundamental thermodynamic parameter used to describe physical, chemical and biological processes. Much effort is made to measure temperature accurately in a wide variety of applications, making temperature one of the most extensively measured parameters. In combustion as in many other applications, temperature plays a substantial role in helping to maintain an efficient and clean environment. Being able to measure temperature accurately in combustion and in fire-related applications is important for giving a better understanding of heat transfer phenomena and improving existing models.



A method based on the spectroscopy of inorganic luminescent materials is described here and is employed in experiments related to combustion. The method involves use of thermographic phosphors which enable remote temperature diagnostics to be performed with a high degree of sensitivity and accuracy. The technique is superior to those based on thermocouples and pyrometry, particularly in the vicinity of flames and when the measured surface is subjected to random movements. Thermographic phosphors are applied here to temperature measurements in one-point and in two-dimensions within flamespread scenarios. Results obtained in this small-scale flamespread scenario served as input data to various subprojects within the framework of a more extensive flamespread project. The technique was also employed in pyrolysis experiments involving different construction materials and polymers. The experiments included simultaneous measurements of surface temperature and mass-loss rate for the verification of a pyrolysis model applied to the decomposition of these materials. Thermographic phosphors have the property of being insensitive to variations in pressure up to 1 GPa. This property extends the use and development of thermographic thermometry to other domains, such as internal combustion engines. Surface temperatures of the piston and valves of gasoline engines of the direct-injection type were investigated. The temperature was measured at one point and in two dimensions inside the combustion chamber. The results suggest that developing the technique for thermometry of diesel engine pistons could be promising. Simultaneous measurements of piston temperature were performed with use of thermographic phosphors and thermocouples. The complex procedures required to implement the use of thermocouples inside an engine make thermocouples an expensive choice, especially with the only very limited possibilities this provides of investigating different engine geometries and components. Thermographic phosphors were also employed in gas turbine applications. Temperature imaging of the afterburner of a full-size aircraft engine was performed in combination with fuel visualisation by use of laser-induced fluorescence. The experiments were aimed at studying the effects of various engine loads on wall temperatures and fuel efficiency.



Thermographic phosphors were used to study the temperature of droplets in relation to spray generation. In spray dynamics, temperature is a crucial parameter for gaining an understanding of atomisation, of evaporation and of heat convection from the surrounding gases. Although the technique is in first stage of its development, promising results for mono-dispersed droplets and sprays were obtained. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • Dr Allison, Stephen, Oak Ridge National Laboratory, USA
organization
publishing date
type
Thesis
publication status
published
subject
keywords
framdrivningssystem, Motorer, Motors and propulsion systems, Laser technology, Laserteknik, Teknik, Technological sciences, Physics, Pyrolysis, Flame spread, Droplet, Engine, Imaging, Temperature, Thermographic phosphors, Combustion, Fysik, Laser diagnostics
pages
276 pages
publisher
KFS AB
defense location
Room B, Department of Physics Professorsgatan 1, Lund Institute of Technology
defense date
2005-04-15 10:15:00
external identifiers
  • other:ISRN: LUTFD2/TFCP--105--SE
ISBN
91-628-6469-6
language
English
LU publication?
yes
additional info
Alaa Omrane, Ulf Göransson, Frederik Ossler and Marcus Aldén. 2002. Surface temperature measurement of flame spread using thermographic phosphors Fire safety science-proceedings of the seventh international symposium, pp 144--152.
Alaa Omrane, Frederik Ossler and Marcus Aldén. 2002. Two-dimensional surface temperature measurement of burning materials Proceedings of the Combustion Institute, vol 29 pp 2653--2659.
Alaa Omrane, Frederik Ossler, Marcus Aldén, Jenny Svensson and Jan Petterson. 2005. Surface temperature of decomposing construction materials studied by laser-induced phophorescence Fire and Materials, vol 29 pp 39--51.
Jenny Svensson, Jenny Petterson, Alaa Omrane, Frederik Ossler, Marcus Aldén, Michel Bellais, Truls Liliedahl and Krister Sjöström. 2005. Surface temperature of wood particles during rapid pyrolysis: Laser-induced phosphorescence measurements and modeling Proceedings of the science in thermal and chemical biomas conversion conference, (inpress)
Alaa Omrane, Ulf Göransson, Yong Wang, Göran Holmstedt and Marcus Aldén. 2005. Intumescent paint temperature evaluation in a cone calorimeter: laser-induced phosphorescence and modeling Fire Safety Journal, (submitted)
Alaa Omrane, Greger Juhlin, Marcus Aldén, Göran Josefsson, Johan Engström and Timothy Benham. 2004. Two-dimensional temperature characterization of valves and piston of a GDI optical engine SAE, vol 2004-01-0609
Tobias Husberg, Savo Girja, Ingemar Denbratt, Alaa Omrane, Marcus Aldén and Johan Engström. 2005. Piston temperature measurement by use of thermographic phosphors and thermocouples in a heavy-duty Diesel engine run under partly premixed conditions SAE, vol 2005-01-1646
Hans Seyfried, Gustaf Särner, Alaa Omrane, Mattias Richter, Håkan Schmidt and Marcus Aldén. 2005. Optical diagnostics for characterization of a full-size fighter-jet after-burner ASME, vol GT2005-69058
Alaa Omrane, Greger Juhlin, Frederik Ossler and Marcus Aldén. 2004. Temperature measurements of single droplets using laser-induced phosphorescence Applied Optics, vol 43 pp 3523--3529.
Alaa Omrane, Gustaf Särner and Marcus Aldén. 2004. 2D-temperature imaging of single droplets and sprays using thermographic phosphors Applied Physics B, vol 79 pp 431--434.
Alaa Omrane, Sabina Santesson, Staffan Nilsson and Marcus Aldén. 2004. Laser techniques in acoustically levitated micro droplets Lab Chip Journal, vol 4 pp 287--291.
Johan Hult, Alaa Omrane, Jenny Nygren, Clemens Kaminski, Boman Axelsson, Robert Collin, Per-Erik Bengtsson and Marcus Aldén. 2002. Quantitative three-dimensional imaging of soot volume fraction in turbulent non-premixed flames Experiments in Fluids, vol 33 pp 265--269.
id
a360508c-765a-49b2-8b48-3e46f048857d (old id 544543)
date added to LUP
2016-04-01 15:50:59
date last changed
2018-11-21 20:36:51
@phdthesis{a360508c-765a-49b2-8b48-3e46f048857d,
  abstract     = {{Temperature is a fundamental thermodynamic parameter used to describe physical, chemical and biological processes. Much effort is made to measure temperature accurately in a wide variety of applications, making temperature one of the most extensively measured parameters. In combustion as in many other applications, temperature plays a substantial role in helping to maintain an efficient and clean environment. Being able to measure temperature accurately in combustion and in fire-related applications is important for giving a better understanding of heat transfer phenomena and improving existing models.<br/><br>
<br/><br>
A method based on the spectroscopy of inorganic luminescent materials is described here and is employed in experiments related to combustion. The method involves use of thermographic phosphors which enable remote temperature diagnostics to be performed with a high degree of sensitivity and accuracy. The technique is superior to those based on thermocouples and pyrometry, particularly in the vicinity of flames and when the measured surface is subjected to random movements. Thermographic phosphors are applied here to temperature measurements in one-point and in two-dimensions within flamespread scenarios. Results obtained in this small-scale flamespread scenario served as input data to various subprojects within the framework of a more extensive flamespread project. The technique was also employed in pyrolysis experiments involving different construction materials and polymers. The experiments included simultaneous measurements of surface temperature and mass-loss rate for the verification of a pyrolysis model applied to the decomposition of these materials. Thermographic phosphors have the property of being insensitive to variations in pressure up to 1 GPa. This property extends the use and development of thermographic thermometry to other domains, such as internal combustion engines. Surface temperatures of the piston and valves of gasoline engines of the direct-injection type were investigated. The temperature was measured at one point and in two dimensions inside the combustion chamber. The results suggest that developing the technique for thermometry of diesel engine pistons could be promising. Simultaneous measurements of piston temperature were performed with use of thermographic phosphors and thermocouples. The complex procedures required to implement the use of thermocouples inside an engine make thermocouples an expensive choice, especially with the only very limited possibilities this provides of investigating different engine geometries and components. Thermographic phosphors were also employed in gas turbine applications. Temperature imaging of the afterburner of a full-size aircraft engine was performed in combination with fuel visualisation by use of laser-induced fluorescence. The experiments were aimed at studying the effects of various engine loads on wall temperatures and fuel efficiency.<br/><br>
<br/><br>
Thermographic phosphors were used to study the temperature of droplets in relation to spray generation. In spray dynamics, temperature is a crucial parameter for gaining an understanding of atomisation, of evaporation and of heat convection from the surrounding gases. Although the technique is in first stage of its development, promising results for mono-dispersed droplets and sprays were obtained.}},
  author       = {{Omrane, Alaa}},
  isbn         = {{91-628-6469-6}},
  keywords     = {{framdrivningssystem; Motorer; Motors and propulsion systems; Laser technology; Laserteknik; Teknik; Technological sciences; Physics; Pyrolysis; Flame spread; Droplet; Engine; Imaging; Temperature; Thermographic phosphors; Combustion; Fysik; Laser diagnostics}},
  language     = {{eng}},
  publisher    = {{KFS AB}},
  school       = {{Lund University}},
  title        = {{Thermometry Using Laser-Induced Emission from Thermographic Phosphors: Development and Applications in Combustion}},
  year         = {{2005}},
}