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JSIR Vol.66 [2007] >
JSIR Vol.66(07) [July 2007] >
| Title: | Temperature and soot formation in a natural gas diffusion flame |
| Authors: | Ofodu, J C
Hart, H I |
| Keywords: | Diffusion flame
Natural gas
Soot
Temperature |
| Issue Date: | Jul-2007 |
| Publisher: | CSIR |
| Abstract: | Study presents temperature and soot formation profile within a natural gas diffusion flame under the equivalence
ratios of 0.35, 0.90, 1.70 and 2.56. An in-house combustion Test-Rig designed for diffusion flame studies was used for
temperature distribution and gravimetric soot mass. The soot was samples with an isokinetic probe insert, from this; a fairly
accurate value of the soot number density and volume fraction was computed. There was sharp increases in the line-of-sight
flame temperature within the centerline with peak values occurring at some distances of 6, 12, 12 and 9 cm from the burner
rim, corresponding to 0.35, 0.90, 1.70 and 2.56 equivalence ratios respectively, after which it decreases gradually. A clear
marked reduction was observed in temperature values as the condition of fuel mixture changes from lean to heavy rich. This
reduced temperature that was most evident of flame equivalence ratio of 2.56 has been traced to be as a result of high sooty
condition imposed by this fuel rich mixture. This condition of soot laden, enhances high rate of heat losses through adverse
radiative heat transfer, thereby decreases flame temperature and combustion efficiencies of the parent user device. It was also
observed that the gravimetric soot mass profile is much regular in behaviour for the lean mixture flames as it increases with
increase in measured temperature values. Contrarily, for a richer mixture of 2.56, it increases with decrease in temperature.j |
| Page(s): | 570-576 |
| ISSN: | 0022-4456 |
| Source: | JSIR Vol.66(07) [July 2007]
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