Modeling Study to Evaluate the Ionic Mechanism of Soot Formation in Flames PDF Download
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Languages : en
Pages : 37
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Book Description
A study is underway to evaluate the proposed ionic mechanism of soot formation by developing a computer model and comparing it with experimental results and with equivalent models based on neutral species. During the present report period both the thermodynamic and reaction kinetic dat base for ion- molecule reactions have been updated and expanded. The CHEMKIN-II flame code, revised last report period, to handle ions is now operating routinely and has bee used to calculate ion profiles for the standard acetylene/oxygen flame. The results are generally in good agreement with experiment, except for the benzotropylium ion, for which the calculated value is about three orders of magnitude less than the experimental value. Poor thermodynamics are suspected. A comparison of data in the literature on the effect of equivalence ratio on acetylene and soot yield with values calculated by thermodynamic equilibrium for a number of fuels show that in general measured acetylene and soot concentrations are far in excess of equilibrium, especially below the threshold soot index. The standard acetylene/oxygen flame seems to be an exception. The results continue to support an ionization mechanism of soot formation ... Soot Formation, Ionic Mechanism, Thermodynamics, Ion-Molecule Reactions, Computer Modeling.
Author:
Publisher:
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Category :
Languages : en
Pages : 37
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Book Description
A study is underway to evaluate the proposed ionic mechanism of soot formation by developing a computer model and comparing it with experimental results and with equivalent models based on neutral species. During the present report period both the thermodynamic and reaction kinetic dat base for ion- molecule reactions have been updated and expanded. The CHEMKIN-II flame code, revised last report period, to handle ions is now operating routinely and has bee used to calculate ion profiles for the standard acetylene/oxygen flame. The results are generally in good agreement with experiment, except for the benzotropylium ion, for which the calculated value is about three orders of magnitude less than the experimental value. Poor thermodynamics are suspected. A comparison of data in the literature on the effect of equivalence ratio on acetylene and soot yield with values calculated by thermodynamic equilibrium for a number of fuels show that in general measured acetylene and soot concentrations are far in excess of equilibrium, especially below the threshold soot index. The standard acetylene/oxygen flame seems to be an exception. The results continue to support an ionization mechanism of soot formation ... Soot Formation, Ionic Mechanism, Thermodynamics, Ion-Molecule Reactions, Computer Modeling.
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Category :
Languages : en
Pages : 0
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Book Description
Development of a thermochemical data base containing seventy cations of possible importance in soot formation was completed. The results were generalized for the estimation of the Gibbs energies of cations not included in the data base. The chemical kinetic model was expanded to include the chemiionization step by adding concentration profiles of O atoms and electronically excite CH as inputs to the program. The computer code was modified to include the chemiionization step, electron attachment and cation-anion recombination. Under some conditions the computer model and experiment were in excellent agreement, but questions remained. Analysis performed in this project indicated that gas sample cooling by the mass spectrometer sampling cone could have, for some cations, caused reactions to occur so that the mass analysis indicated a different ion from that in the flame. Calculations showed that energy liberated in rapid ion-molecule reactions accumulates in the product cation complicating the reaction kinetics. A survey of published flame measurements found that only ions dramatically change at soot threshold, but no explanation for this change was identified. The possible importance of choosing a neutral or ionic mechanism on the results of modeling soot formation in turbulent flow was considered.
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Category : Denver (Colo.)
Languages : en
Pages : 26
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Author:
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Category : Aeronautics
Languages : en
Pages : 464
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Author: David M. Mann
Publisher:
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Category : Chemical reactions
Languages : en
Pages : 302
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Partial contents: Supercritical droplet behavior; Fundamentals of acoustic instabilities in liquid-propellant rockets; Modeling liquid jet atomization proceses; Liquid-propellant droplets dynamics and combustions in supercritical forced convective environments; Contributions of shear coaxial injectors to liquid rocket motor combustion instabilities; High pressure combustion studies under combustion driven oscillatory flow conditions; Droplet collision on liquid propellant combustion; Combustion and plumes; Development of a collisional radiative emission model for strongly nonequilibrium flows; Energy transfer processes in the production of excited states in reacting rocket flows; modeling nonequilibrium radiation in high altitude plumes; kinetics of plume radiation, and of HEDMs and metallic fuels combustion; Nonsteady combustion mechanisms of advanced solid propellants; Chemical mechanisms at the burning surface. p15
Author: Henning Bockhorn
Publisher: Springer Science & Business Media
ISBN: 3642851673
Category : Science
Languages : en
Pages : 595
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Book Description
Soot Formation in Combustion represents an up-to-date overview. The contributions trace back to the 1991 Heidelberg symposium entitled "Mechanism and Models of Soot Formation" and have all been reedited by Prof. Bockhorn in close contact with the original authors. The book gives an easy introduction to the field for newcomers, and provides detailed treatments for the specialists. The following list of contents illustrates the topics under review:
Author:
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ISBN:
Category : Power resources
Languages : en
Pages : 444
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Author: H. F. Calcote
Publisher:
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Category : Carbon
Languages : en
Pages :
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Author:
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ISBN:
Category : Science
Languages : en
Pages : 784
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Author:
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ISBN:
Category : Weights and measures
Languages : en
Pages : 476
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