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Analysis of the Ionization Equilibrium in the Post-Flame Zone

Franke, Axel LU ; Einewall, Patrik LU ; Larsson, Anders and Reinmann, Raymond (2003) In SAE Technical Papers
Abstract
A combined experimental and theoretical effort has been made to identify the most important contributors to equilibrium ionization in the post-flame gas. In the past, nitric oxide (NO) has always been assumed to be the main electron donor in the compressed hot post-flame gases. However, correlations observed between the amount of NO in the exhaust gases and the current amplitude may be deceiving due to the fact that both the formation of NO and the ionization process are strongly temperature dependent.



The temperature-current relationship in data from various experiments in constant volume combustion chambers and engines was utilized to check the hypothesis that NO acts as the major contributor to ionization. Based on a... (More)
A combined experimental and theoretical effort has been made to identify the most important contributors to equilibrium ionization in the post-flame gas. In the past, nitric oxide (NO) has always been assumed to be the main electron donor in the compressed hot post-flame gases. However, correlations observed between the amount of NO in the exhaust gases and the current amplitude may be deceiving due to the fact that both the formation of NO and the ionization process are strongly temperature dependent.



The temperature-current relationship in data from various experiments in constant volume combustion chambers and engines was utilized to check the hypothesis that NO acts as the major contributor to ionization. Based on a well-motivated model for the current, the effect of temperature and electron donor concentration has been separated. The results indicate that species with much lower ionization energy than NO make a significant contribution to the conductivity of the gas in the post- flame zone. Assuming realistic concentrations of the most abundant alkali metals in air, an analysis of the ionization equilibrium has been performed. The results substantiate the experimental findings. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
combustion Engines combustion physics laserdiagnostic
in
SAE Technical Papers
publisher
Society of Automotive Engineers
external identifiers
  • Scopus:80055067607
language
English
LU publication?
yes
id
66518817-2915-4e49-8326-31cfe34eb65a (old id 707694)
alternative location
http://www.sae.org/technical/papers/2003-01-0715
date added to LUP
2007-12-07 14:07:15
date last changed
2016-11-15 13:22:53
@misc{66518817-2915-4e49-8326-31cfe34eb65a,
  abstract     = {A combined experimental and theoretical effort has been made to identify the most important contributors to equilibrium ionization in the post-flame gas. In the past, nitric oxide (NO) has always been assumed to be the main electron donor in the compressed hot post-flame gases. However, correlations observed between the amount of NO in the exhaust gases and the current amplitude may be deceiving due to the fact that both the formation of NO and the ionization process are strongly temperature dependent. <br/><br>
<br/><br>
The temperature-current relationship in data from various experiments in constant volume combustion chambers and engines was utilized to check the hypothesis that NO acts as the major contributor to ionization. Based on a well-motivated model for the current, the effect of temperature and electron donor concentration has been separated. The results indicate that species with much lower ionization energy than NO make a significant contribution to the conductivity of the gas in the post- flame zone. Assuming realistic concentrations of the most abundant alkali metals in air, an analysis of the ionization equilibrium has been performed. The results substantiate the experimental findings.},
  author       = {Franke, Axel and Einewall, Patrik and Larsson, Anders and Reinmann, Raymond},
  keyword      = {combustion Engines
combustion physics
laserdiagnostic},
  language     = {eng},
  publisher    = {ARRAY(0x8d6f3c0)},
  series       = {SAE Technical Papers},
  title        = {Analysis of the Ionization Equilibrium in the Post-Flame Zone},
  year         = {2003},
}