Soot volume fraction (f<sub>sv</sub>) 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<sub>sv</sub> 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<sub>sv</sub> is found to scale with pressure as <I>p</I><sup>1.2</sup> for methane and <I>p</I><sup>1.7</sup> for ethylene.
Identifer | oai:union.ndltd.org:NCSU/oai:NCSU:etd-07172003-200058 |
Date | 18 July 2003 |
Creators | McCrain, Laura L. |
Contributors | Dr. William L. Roberts, Dr. Stefan Franzen, Dr. Jack R. Edwards |
Publisher | NCSU |
Source Sets | North Carolina State University |
Language | English |
Detected Language | English |
Type | text |
Format | application/pdf |
Source | http://www.lib.ncsu.edu/theses/available/etd-07172003-200058/ |
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