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Modeling and analysis of chemilumine...

Georgia Institute of Technology.

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Modeling and analysis of chemiluminescence sensing for syngas, methane and Jet-A combustion.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Modeling and analysis of chemiluminescence sensing for syngas, methane and Jet-A combustion./
Author:	Nori, Venkata Narasimham.
Description:	187 p.
Notes:	Adviser: Jerry M. Seitzman.
Contained By:	Dissertation Abstracts International69-09B.
Subject:	Engineering, Aerospace. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3327632
ISBN:	9780549800712

Modeling and analysis of chemiluminescence sensing for syngas, methane and Jet-A combustion.
Nori, Venkata Narasimham.

Modeling and analysis of chemiluminescence sensing for syngas, methane and Jet-A combustion. - 187 p.

Adviser: Jerry M. Seitzman.

Thesis (Ph.D.)--Georgia Institute of Technology, 2008.

Flame chemiluminescence has received increasing attention for its potential sensor and diagnostic applications in combustors. A number of studies have used flame chemiluminescence to monitor flame status, and combustor performance. While most of these studies have been empirical in nature, chemiluminescence modeling has the potential to provide a better understanding of the chemiluminescence processes and their dependence on various combustion operating conditions.

ISBN: 9780549800712Subjects--Topical Terms:

1018395
Engineering, Aerospace.

Modeling and analysis of chemiluminescence sensing for syngas, methane and Jet-A combustion.
LDR:03670nam 2200325 a 45 001 861538
005 20100719
008 100719s2008 ||||||||||||||||| ||eng d
020 $a 9780549800712
035 $a (UMI)AAI3327632
035 $a AAI3327632
040 $a UMI $c UMI
100 1 $a Nori, Venkata Narasimham. $3 1029251
245 1 0 $a Modeling and analysis of chemiluminescence sensing for syngas, methane and Jet-A combustion.
300 $a 187 p.
500 $a Adviser: Jerry M. Seitzman.
500 $a Source: Dissertation Abstracts International, Volume: 69-09, Section: B, page: 5561.
502 $a Thesis (Ph.D.)--Georgia Institute of Technology, 2008.
520 $a Flame chemiluminescence has received increasing attention for its potential sensor and diagnostic applications in combustors. A number of studies have used flame chemiluminescence to monitor flame status, and combustor performance. While most of these studies have been empirical in nature, chemiluminescence modeling has the potential to provide a better understanding of the chemiluminescence processes and their dependence on various combustion operating conditions.
520 $a The primary objective of this research was to identify and validate the important chemiluminescence reaction mechanisms for OH*, CH* and CO2 *. To this end, measurements were performed at various operating conditions, primarily in laminar, premixed flames, fueled with methane, syngas (H 2/CO) and Jet-A. The results are compared to 1-d laminar flame simulations employing the chemiluminescence mechanisms. The secondary objective was to use the experiments and validated chemiluminescence reaction mechanisms to evaluate the usefulness of flame chemiluminescence as a combustion diagnostic, particularly for heat release rate and equivalence ratio.
520 $a The validation studies were able to identify specific mechanisms for OH*, CH* and CO2* that produced excellent agreement with the experimental data in most cases. The mechanisms were able to predict the variation of the chemiluminescence signals with equivalence ratio but not with pressure and reactant preheat. The reasons causing this disagreement could be due to the inaccuracies in the basic chemical mechanism used in the simulations, lack of accurate quenching data (for CH*), thermal excitation (for OH*) and radiative trapping (for OH* and CO2*) and interference from the emissions of other species (such as HCO and H2O), for CO2*.
520 $a Regarding the utility of chemiluminescence for sensing, a number of observations can be made. In syngas-air flames, CO2* is a reasonable heat release rate marker, at least for very lean conditions. OH* shows some advantage in atmospheric-pressure methane and Jet-A flames in general, while CH* is advantageous at high pressure and very lean conditions at atmospheric pressure. The CO 2*/OH* intensity ratio is not useful for sensing equivalence ratio in syngas flames, except maybe at very lean conditions. However, the CH*/OH* signal ratio is a promising approach for sensing equivalence ratio at low or very high pressure conditions in hydrocarbon flames. Thermal excitation and self-absorption processes for OH* chemiluminescence can become important for combustors operating at high pressure, high preheat and near stoichiometric conditions. Background subtracted chemiluminescence signals are recommended for sensing purposes.
590 $a School code: 0078.
650 4 $a Engineering, Aerospace. $3 1018395
650 4 $a Engineering, Automotive. $3 1018477
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0538
690 $a 0540
690 $a 0548
710 2 $a Georgia Institute of Technology. $3 696730
773 0 $t Dissertation Abstracts International $g 69-09B.
790 $a 0078
790 1 0 $a Seitzman, Jerry M., $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3327632