Author: Kenneth B. Jordan
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 208
Book Description
Comparison of Detailed Chemical Kinetics Mechanisms for Modeling Nitric Oxide Formation in Premixed Ethane Flames
Author: Kenneth B. Jordan
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 208
Book Description
Publisher:
ISBN:
Category : Chemical kinetics
Languages : en
Pages : 208
Book Description
Measurements and Modeling of Nitric Oxide Formation in Counterflow, Premixed Ch4/O2/N2 Flames
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721932672
Category :
Languages : en
Pages : 286
Book Description
Laser-induced fluorescence (LIF) measurements of NO concentration in a variety of CH4/O2/N2 flames are used to evaluate the chemical kinetics of NO formation. The analysis begins with previous measurements in flat, laminar, premixed CH4/O2/N2 flames stabilized on a water-cooled McKenna burner at pressures ranging from 1 to 14.6 atm, equivalence ratios from 0.5 to 1.6, and volumetric nitrogen/oxygen dilution ratios of 2.2, 3.1 and 3.76. These measured results are compared to predictions to determine the capabilities and limitations of the comprehensive kinetic mechanism developed by the Gas Research Institute (GRI), version 2.11. The model is shown to predict well the qualitative trends of NO formation in lean-premixed flames, while quantitatively underpredicting NO concentration by 30-50%. For rich flames, the model is unable to even qualitatively match the experimental results. These flames were found to be limited by low temperatures and an inability to separate the flame from the burner surface. In response to these limitations, a counterflow burner was designed for use in opposed premixed flame studies. A new LIF calibration technique was developed and applied to obtain quantitative measurements of NO concentration in laminar, counterflow premixed, CH4/O2/N2 flames at pressures ranging from 1 to 5.1 atm, equivalence ratios of 0.6 to 1.5, and an N2/O2 dilution ratio of 3.76. The counterflow premixed flame measurements are combined with measurements in burner-stabilized premixed flames and counterflow diffusion flames to build a comprehensive database for analysis of the GRI kinetic mechanism. Pathways, quantitative reaction path and sensitivity analyses are applied to the GRI mechanism for these flame conditions. The prompt NO mechanism is found to severely underpredict the amount of NO formed in rich premixed and nitrogen-diluted diffusion flames. This underprediction is traced to uncertainties in the CH kinetics as well as in the nitrogen oxidation chemistry. S
Publisher: Createspace Independent Publishing Platform
ISBN: 9781721932672
Category :
Languages : en
Pages : 286
Book Description
Laser-induced fluorescence (LIF) measurements of NO concentration in a variety of CH4/O2/N2 flames are used to evaluate the chemical kinetics of NO formation. The analysis begins with previous measurements in flat, laminar, premixed CH4/O2/N2 flames stabilized on a water-cooled McKenna burner at pressures ranging from 1 to 14.6 atm, equivalence ratios from 0.5 to 1.6, and volumetric nitrogen/oxygen dilution ratios of 2.2, 3.1 and 3.76. These measured results are compared to predictions to determine the capabilities and limitations of the comprehensive kinetic mechanism developed by the Gas Research Institute (GRI), version 2.11. The model is shown to predict well the qualitative trends of NO formation in lean-premixed flames, while quantitatively underpredicting NO concentration by 30-50%. For rich flames, the model is unable to even qualitatively match the experimental results. These flames were found to be limited by low temperatures and an inability to separate the flame from the burner surface. In response to these limitations, a counterflow burner was designed for use in opposed premixed flame studies. A new LIF calibration technique was developed and applied to obtain quantitative measurements of NO concentration in laminar, counterflow premixed, CH4/O2/N2 flames at pressures ranging from 1 to 5.1 atm, equivalence ratios of 0.6 to 1.5, and an N2/O2 dilution ratio of 3.76. The counterflow premixed flame measurements are combined with measurements in burner-stabilized premixed flames and counterflow diffusion flames to build a comprehensive database for analysis of the GRI kinetic mechanism. Pathways, quantitative reaction path and sensitivity analyses are applied to the GRI mechanism for these flame conditions. The prompt NO mechanism is found to severely underpredict the amount of NO formed in rich premixed and nitrogen-diluted diffusion flames. This underprediction is traced to uncertainties in the CH kinetics as well as in the nitrogen oxidation chemistry. S
Measurements and Modeling of Nitric Oxide Formation in Counterflow, Premixed CH4/O2/N2 Flames
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
Book Description
Chemical Kinetic Models for Combustion of Hydrocarbons and Formation of Nitric Oxide
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725555693
Category :
Languages : en
Pages : 34
Book Description
The formation of nitrogen oxides NOx during combustion of methane, propane, and a jet fuel, JP-4, was investigated in a jet stirred combustor. The results of the experiments were interpreted using reaction models in which the nitric oxide (NO) forming reactions were coupled to the appropriate hydrocarbon combustion reaction mechanisms. Comparison between the experimental data and the model predictions reveals that the CH + N2 reaction process has a significant effect on NO formation especially in stoichiometric and fuel rich mixtures. Reaction models were assembled that predicted nitric oxide levels that were in reasonable agreement with the jet stirred combustor data and with data obtained from a high pressure (5.9 atm (0.6 MPa)), prevaporized, premixed, flame tube type combustor. The results also suggested that the behavior of hydrocarbon mixtures, like JP-4, may not be significantly different from that of pure hydrocarbons. Application of the propane combustion and nitric oxide formation model to the analysis of NOx emission data reported for various aircraft gas turbines showed the contribution of the various nitric oxide forming processes to the total NOx formed. Jachimowski, C. J. and Wilson, C. H. Langley Research Center NASA-TP-1794, L-14106 RTOP 506-52-33-01...
Publisher: Createspace Independent Publishing Platform
ISBN: 9781725555693
Category :
Languages : en
Pages : 34
Book Description
The formation of nitrogen oxides NOx during combustion of methane, propane, and a jet fuel, JP-4, was investigated in a jet stirred combustor. The results of the experiments were interpreted using reaction models in which the nitric oxide (NO) forming reactions were coupled to the appropriate hydrocarbon combustion reaction mechanisms. Comparison between the experimental data and the model predictions reveals that the CH + N2 reaction process has a significant effect on NO formation especially in stoichiometric and fuel rich mixtures. Reaction models were assembled that predicted nitric oxide levels that were in reasonable agreement with the jet stirred combustor data and with data obtained from a high pressure (5.9 atm (0.6 MPa)), prevaporized, premixed, flame tube type combustor. The results also suggested that the behavior of hydrocarbon mixtures, like JP-4, may not be significantly different from that of pure hydrocarbons. Application of the propane combustion and nitric oxide formation model to the analysis of NOx emission data reported for various aircraft gas turbines showed the contribution of the various nitric oxide forming processes to the total NOx formed. Jachimowski, C. J. and Wilson, C. H. Langley Research Center NASA-TP-1794, L-14106 RTOP 506-52-33-01...
Chemical Kinetic Models for Combustion of Hydrocarbons and Formation of Nitric Oxide
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Book Description
Chemical Kinetic Models for Combustion of Hydrocarbons and Formation of Nitric Oxide
Author: Casimir J. Jachimowski
Publisher:
ISBN:
Category : Hydrocarbons
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Hydrocarbons
Languages : en
Pages : 36
Book Description
Kinetic Mechanisms for Premixed, Laminar, Steady State Hydrogen/Nitrous Oxide Flames
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
Book Description
This report pertains to the detailed kinetics governing premixed, laminar, one-dimensional hydrogen/nitrous oxide flames. The long range goal is to understand the kinetics governing propellant decomposition, where nitrogen chemistry is important. Hydrogen/nitrous oxide flames are the simplest case of a flame controlled by nitrogen chemistry. A model has been developed for premixed, laminar, one-dimensional hydrogen/nitrous oxide flames. Results have been compared with a range of experimental data. The present model roughly reproduces the data, but inaccuracies still exist. Sensitivity and screening analyses have been used to indicate the additional experimental data needed to improve the model. Keywords: Burning Velocity.
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
Book Description
This report pertains to the detailed kinetics governing premixed, laminar, one-dimensional hydrogen/nitrous oxide flames. The long range goal is to understand the kinetics governing propellant decomposition, where nitrogen chemistry is important. Hydrogen/nitrous oxide flames are the simplest case of a flame controlled by nitrogen chemistry. A model has been developed for premixed, laminar, one-dimensional hydrogen/nitrous oxide flames. Results have been compared with a range of experimental data. The present model roughly reproduces the data, but inaccuracies still exist. Sensitivity and screening analyses have been used to indicate the additional experimental data needed to improve the model. Keywords: Burning Velocity.
Experimental and Analytical Study of Nitric Oxide Formation During Combustion of Propane in a Jet-stirred Combustor
Author: N. T. Wakelyn
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 36
Book Description
Publisher:
ISBN:
Category : Combustion
Languages : en
Pages : 36
Book Description
Applied Combustion Diagnostics
Author: Katharina Kohse-Hoinghaus
Publisher: CRC Press
ISBN: 1498719414
Category : Technology & Engineering
Languages : en
Pages : 734
Book Description
The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measuremen
Publisher: CRC Press
ISBN: 1498719414
Category : Technology & Engineering
Languages : en
Pages : 734
Book Description
The editors have assembled a world-class group of contributors who address the questions the combustion diagnostic community faces. They are chemists who identify the species to be measured and the interfering substances that may be present; physicists, who push the limits of laser spectroscopy and laser devices and who conceive suitable measuremen
Detailed and Reduced Kinetic Mechanisms in Low-emission Combustion Processes
Author: Sylvie Honnet
Publisher: Cuvillier Verlag
ISBN: 386727391X
Category :
Languages : en
Pages : 147
Book Description
Publisher: Cuvillier Verlag
ISBN: 386727391X
Category :
Languages : en
Pages : 147
Book Description