Book Description
Keywords: diffusion flame, high pressure, soot formation.
Author : Laura Lynne McCrain
Publisher :
Page : 69 pages
File Size : 20,83 MB
Release : 2003
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Keywords: diffusion flame, high pressure, soot formation.
Author :
Publisher :
Page : pages
File Size : 11,45 MB
Release : 2003
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Soot volume fraction (f[subscript sv]) is measured quantitatively in a laminar diffusion flame at elevated pressures up to 25 atmospheres as a function of fuel type in order to gain a better understanding of the effects of pressure on the soot formation process. Methane and ethylene are used as fuels; methane is chosen since it is the simplest hydrocarbon while ethylene represents a larger hydrocarbon with a higher propensity to soot. Soot continues to be of interest because it is a sensitive indicator of the interactions between combustion chemistry and fluid mechanics and a known pollutant. To examine the effects of increased pressure on soot formation, Laser Induced Incandescence (LII) is used to obtain the desired temporally and spatially resolved, instantaneous f[subscript sv] measurements as the pressure is incrementally increased up to 25 atmospheres. The effects of pressure on the physical characteristics of the flame are also observed. A laser light extinction method that accounts for signal trapping and laser attenuation is used for calibration that results in quantitative results. The local peak f[subscript sv] is found to scale with pressure as p[superscript 1.2] for methane and p[superscript 1.7] for ethylene.
Author :
Publisher :
Page : 5 pages
File Size : 13,83 MB
Release : 1885*
Category : Railroads
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Author : L. L. McCrain
Publisher :
Page : pages
File Size : 22,59 MB
Release : 2003
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Page : pages
File Size : 14,55 MB
Release : 2004
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Author : Adel Maurice Iskander
Publisher :
Page : 440 pages
File Size : 44,22 MB
Release : 1987
Category : Flame
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Author : Chul Han Kim
Publisher :
Page : 408 pages
File Size : 36,2 MB
Release : 2005
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Author : Guozheng Lin
Publisher :
Page : 568 pages
File Size : 42,25 MB
Release : 1996
Category : Flame
ISBN :
Author : Henning Bockhorn
Publisher : Springer Science & Business Media
Page : 595 pages
File Size : 27,45 MB
Release : 2013-03-08
Category : Science
ISBN : 3642851673
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 : Decio S. (Decio Santos) Bento
Publisher : Library and Archives Canada = Bibliothèque et Archives Canada
Page : 158 pages
File Size : 48,33 MB
Release : 2005
Category : Combustion
ISBN : 9780494024430
Laminar axisymmetric propane air diffusion flames were studied at pressures 0.1 to 0.725 MPa (1 to 7.25 atm). To investigate the effect of pressure on soot formation, radially resolved soot temperatures and soot volume fractions were deduced from soot radiation emission scans collected at various pressures using spectral soot emission (SSE). Overall flame stability was quite good as judged by the naked eye. Flame heights varied by 15% and flame axial diameters decreased by 30% over the entire pressure range.Analysis of temperature sensitivity to variations in E lambda(m) revealed that a change in E lambda(m) of +/-20% produced a change in local temperature values of about 75 to 100 K or about 5%.Temperatures decreased and soot concentration increased with increased pressure. More specifically, the peak soot volume fraction showed a power law dependence, fv ∝ Pn where n = 2.0 over the entire pressure range. The maximum integrated soot volume fraction also showed a power law relationship with pressure, f ̄v ∝ Pn where n = 3.4 for 1 ≤ P ≤ 2 atm and n = 1.4 for 2 ≤ P ≤ 7.25 atm. The percentage of fuel carbon converted to soot increased with pressure at a rate, etas ∝ Pn where n = 3.3 and n = 1.1 for 1 ≤ P ≤ 2 atm and 2 ≤ P ≤ 7.25 atm respectively.