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Phosphor Thermometry: Advances in Technique Development and Applications

Abou Nada, Fahed LU (2016)
Abstract
Understanding the mechanisms that govern the combustion processes is important for being able to further increase the efficiency of
combustion devices. Temperature is considered to be one of the most important parameters controlling the progression and final
products of combustion. Regulating the temperature in combustion devices enables higher degrees of efficiency to be achieved. The
engine components in combustion devices are subjected to high levels of thermal load. These can strain many of the engine components
and if it is unattended to can lead to catastrophic engine failure. Temperature information can help to assess the thermal load the engine
is experiencing and as a result can increase the longevity of the... (More)
Understanding the mechanisms that govern the combustion processes is important for being able to further increase the efficiency of
combustion devices. Temperature is considered to be one of the most important parameters controlling the progression and final
products of combustion. Regulating the temperature in combustion devices enables higher degrees of efficiency to be achieved. The
engine components in combustion devices are subjected to high levels of thermal load. These can strain many of the engine components
and if it is unattended to can lead to catastrophic engine failure. Temperature information can help to assess the thermal load the engine
is experiencing and as a result can increase the longevity of the engine while at the same time enabling higher levels of efficiency to be
attained. In addition, the production of emission gases is closely correlated to the temperature present during the combustion of fuel.
Comprehending the spatial and temporal distribution of temperature can aid in finding measures to reduce the levels of emission
generated by a combustion engine.

Although several different temperature-probing techniques that can provide temperature information are available, the harsh and
reactive nature of the experimental conditions present within combustion engines can severely limit the applicability of such techniques.
Phosphor thermometry excels in delivering precise and accurate temperature information concerning harsh environments such as those
present in combustion engines. It is a remote technique that is minimally intrusive and is highly robust. Phosphor thermometry utilizes
the temperature-dependent characteristic emission of thermographic phosphors to retrieve temperature information concerning a
surface or a fluid. The temperatures can be determined either on the basis of the temperature dependence of the decay time of the
phosphorescence or on the basis of temperature-dependent changes in the spectral distribution of the phosphorescence.

The thesis presents the efforts that were made to develop the phosphor thermometry technique further. It involves demonstrations of
use of this technique in combustion engines of different types. The results of the thesis work are reported in two major parts. In the
first part, developments that were made in regard to certain fundamentals of the technique so as to improve its accuracy and precision
are documented. This includes the development of an automatic calibration routine, a more precise characterization of the detector
response, and investigation of the effects of engine lubricant oil on the performance of several different thermographic phosphors. The
second part of the thesis reports on several applications of phosphor thermometry technique to remote probing of the temperature of
different motor components, such as the piston, the cylinder wall, and the burner tip of the combustor. The overall aim of the work
conducted was to improve the precision and the accuracy of decay time-based phosphor thermometry as well as to enhance its
applicability under a wider range of experimental conditions than studied previously. (Less)
Please use this url to cite or link to this publication:
author
supervisor
opponent
  • PhD Eldridge, Jeffrey, NASA Glenn Research Center, USA
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Phosphor thermometry, Laser-based combustion diagnostics, Decay time phosphor thermometry, Fysicumarkivet A:2016:Abou Nada
pages
172 pages
publisher
Division of Combustion Physics, Department of Physics, Lund University
defense location
Rydbergsalen, Fysicum, Professorsgatan 1, Lund University, Faculty of Engineering.
defense date
2016-12-09 09:15
ISBN
978-91-7753-017-6
978-91-7753-016-9
language
English
LU publication?
yes
id
d1326fed-8ead-4e29-bd6c-b5c531c15f67
date added to LUP
2016-11-08 11:42:33
date last changed
2017-01-25 14:57:25
@phdthesis{d1326fed-8ead-4e29-bd6c-b5c531c15f67,
  abstract     = {Understanding the mechanisms that govern the combustion processes is important for being able to further increase the efficiency of<br/>combustion devices. Temperature is considered to be one of the most important parameters controlling the progression and final<br/>products of combustion. Regulating the temperature in combustion devices enables higher degrees of efficiency to be achieved. The<br/>engine components in combustion devices are subjected to high levels of thermal load. These can strain many of the engine components<br/>and if it is unattended to can lead to catastrophic engine failure. Temperature information can help to assess the thermal load the engine<br/>is experiencing and as a result can increase the longevity of the engine while at the same time enabling higher levels of efficiency to be<br/>attained. In addition, the production of emission gases is closely correlated to the temperature present during the combustion of fuel.<br/>Comprehending the spatial and temporal distribution of temperature can aid in finding measures to reduce the levels of emission<br/>generated by a combustion engine.<br/><br/>Although several different temperature-probing techniques that can provide temperature information are available, the harsh and<br/>reactive nature of the experimental conditions present within combustion engines can severely limit the applicability of such techniques.<br/>Phosphor thermometry excels in delivering precise and accurate temperature information concerning harsh environments such as those<br/>present in combustion engines. It is a remote technique that is minimally intrusive and is highly robust. Phosphor thermometry utilizes<br/>the temperature-dependent characteristic emission of thermographic phosphors to retrieve temperature information concerning a<br/>surface or a fluid. The temperatures can be determined either on the basis of the temperature dependence of the decay time of the<br/>phosphorescence or on the basis of temperature-dependent changes in the spectral distribution of the phosphorescence.<br/><br/>The thesis presents the efforts that were made to develop the phosphor thermometry technique further. It involves demonstrations of<br/>use of this technique in combustion engines of different types. The results of the thesis work are reported in two major parts. In the<br/>first part, developments that were made in regard to certain fundamentals of the technique so as to improve its accuracy and precision<br/>are documented. This includes the development of an automatic calibration routine, a more precise characterization of the detector<br/>response, and investigation of the effects of engine lubricant oil on the performance of several different thermographic phosphors. The<br/>second part of the thesis reports on several applications of phosphor thermometry technique to remote probing of the temperature of<br/>different motor components, such as the piston, the cylinder wall, and the burner tip of the combustor. The overall aim of the work<br/>conducted was to improve the precision and the accuracy of decay time-based phosphor thermometry as well as to enhance its<br/>applicability under a wider range of experimental conditions than studied previously.},
  author       = {Abou Nada, Fahed},
  isbn         = {978-91-7753-017-6},
  keyword      = {Phosphor thermometry,Laser-based combustion diagnostics,Decay time phosphor thermometry,Fysicumarkivet A:2016:Abou Nada},
  language     = {eng},
  month        = {10},
  pages        = {172},
  publisher    = {Division of Combustion Physics, Department of Physics, Lund University},
  school       = {Lund University},
  title        = {Phosphor Thermometry: Advances in Technique Development and Applications},
  year         = {2016},
}