[article]
Titre : |
Assessment of current chemiluminescence kinetics models at engine conditions |
Type de document : |
texte imprimé |
Auteurs : |
Eric Petersen, Auteur ; Madeleine Kopp, Auteur ; Nicole Donato, Auteur ; Felix Güthe, Auteur |
Année de publication : |
2012 |
Article en page(s) : |
07 p. |
Note générale : |
Génie mécanique |
Langues : |
Anglais (eng) |
Mots-clés : |
Chemiluminescence Engines Gas turbines Reaction kinetics |
Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
Résumé : |
Chemiluminescence continues to be of interest as a cost-effective optical diagnostic for gas turbine combustor health monitoring. However, most chemical kinetics mechanisms of the chemiluminescence of target species such as OH*, CH*, and CO2* were developed from atmospheric-pressure data. The present paper presents a study wherein the ability of current kinetics models to predict the chemiluminescence trends at engine pressures was assessed. Shock-tube experiments were performed in highly diluted mixtures of H2/O2/Ar at a wide range of pressures to evaluate the ability of a current kinetics model to predict the measured trends. At elevated pressures up to 15 atm, the currently used reaction rate of H + O + M = OH* + M (i.e., without any pressure dependence) significantly over predicts the amount of OH* formed. Other important chemiluminescence species include CH* and CO2*, and separate experiments were performed to assess the validity of existing chemical kinetics mechanisms for both of these species at elevated pressures. A pressure excursion using methane-oxygen mixtures highly diluted in argon was performed up to about 15 atm, and the time histories of CH* and CO2* were measured over a range of temperatures from about 1700 to 2300 K. It was found that the existing CH* mechanism captured the T and P trends rather well, but the CO2* mechanism did a poor job of capturing both the temperature and pressure behavior. With respect to the modeling of collider species, it was found that the current OH* model performs well for N2, but some improvements can be made for CO2. |
DEWEY : |
620.1 |
ISSN : |
0742-4795 |
En ligne : |
http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000134000005 [...] |
in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 134 N° 5 (Mai 2012) . - 07 p.
[article] Assessment of current chemiluminescence kinetics models at engine conditions [texte imprimé] / Eric Petersen, Auteur ; Madeleine Kopp, Auteur ; Nicole Donato, Auteur ; Felix Güthe, Auteur . - 2012 . - 07 p. Génie mécanique Langues : Anglais ( eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 134 N° 5 (Mai 2012) . - 07 p.
Mots-clés : |
Chemiluminescence Engines Gas turbines Reaction kinetics |
Index. décimale : |
620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux |
Résumé : |
Chemiluminescence continues to be of interest as a cost-effective optical diagnostic for gas turbine combustor health monitoring. However, most chemical kinetics mechanisms of the chemiluminescence of target species such as OH*, CH*, and CO2* were developed from atmospheric-pressure data. The present paper presents a study wherein the ability of current kinetics models to predict the chemiluminescence trends at engine pressures was assessed. Shock-tube experiments were performed in highly diluted mixtures of H2/O2/Ar at a wide range of pressures to evaluate the ability of a current kinetics model to predict the measured trends. At elevated pressures up to 15 atm, the currently used reaction rate of H + O + M = OH* + M (i.e., without any pressure dependence) significantly over predicts the amount of OH* formed. Other important chemiluminescence species include CH* and CO2*, and separate experiments were performed to assess the validity of existing chemical kinetics mechanisms for both of these species at elevated pressures. A pressure excursion using methane-oxygen mixtures highly diluted in argon was performed up to about 15 atm, and the time histories of CH* and CO2* were measured over a range of temperatures from about 1700 to 2300 K. It was found that the existing CH* mechanism captured the T and P trends rather well, but the CO2* mechanism did a poor job of capturing both the temperature and pressure behavior. With respect to the modeling of collider species, it was found that the current OH* model performs well for N2, but some improvements can be made for CO2. |
DEWEY : |
620.1 |
ISSN : |
0742-4795 |
En ligne : |
http://asmedl.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ000134000005 [...] |
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