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PAHs and soot formation in laminar partially premixed co-flow flames fuelled by PRFs at elevated pressures

Liang, Shuai; Li, Zhongshan LU ; Gao, Jinlong LU ; Ma, Xiao; Xu, Hongming and Shuai, Shijin (2019) In Combustion and Flame 206. p.363-378
Abstract

This study investigated polycyclic aromatic hydrocarbons (PAHs)and soot formation characteristics in laminar jet flames fuelled by primary reference fuels (PRFs)at elevated pressures. Qualitative PAHs and quantitative soot profiles were acquired by using laser-induced fluorescence and laser-induced incandescence, respectively. The backpressure of flames ranged from 1 bar to 5 bar. Proper flames with the volume fraction of iso-octane in PRFs varying between 0% and 100% and flame equivalent ratio varying between 3.0 and 11.4 were stabilised in a pressurised chamber. The effects of backpressure, equivalent ratio and iso-octane ratio on PAHs and soot formation were evaluated. PAHs and soot formation can be promoted by increasing iso-octane... (More)

This study investigated polycyclic aromatic hydrocarbons (PAHs)and soot formation characteristics in laminar jet flames fuelled by primary reference fuels (PRFs)at elevated pressures. Qualitative PAHs and quantitative soot profiles were acquired by using laser-induced fluorescence and laser-induced incandescence, respectively. The backpressure of flames ranged from 1 bar to 5 bar. Proper flames with the volume fraction of iso-octane in PRFs varying between 0% and 100% and flame equivalent ratio varying between 3.0 and 11.4 were stabilised in a pressurised chamber. The effects of backpressure, equivalent ratio and iso-octane ratio on PAHs and soot formation were evaluated. PAHs and soot formation can be promoted by increasing iso-octane ratio, equivalent ratio and backpressure. The data suggest that PAHs with large molecular size are more sensitive to the increase of backpressure compared with those with small molecular size. Backpressure played a positive role in the growth of PAHs size. The averaged soot volume fraction showed an approximate power-law relation with pressure. The measured averaged soot volume fraction was proportional to pn. Pressure exponent n was 1.34–2.17, 1.41–2.12 and 1.56–2.20 at equivalent ratios of 6.2, 8.5 and 11.4, respectively.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Backpressure, LIF, LII, PAH, PRF, Soot
in
Combustion and Flame
volume
206
pages
16 pages
publisher
Elsevier
external identifiers
  • scopus:85066074104
ISSN
0010-2180
DOI
10.1016/j.combustflame.2019.05.007
language
English
LU publication?
yes
id
e721d5e5-27b9-40fa-a572-245a76ac218d
date added to LUP
2019-06-11 09:50:52
date last changed
2019-07-02 04:47:39
@article{e721d5e5-27b9-40fa-a572-245a76ac218d,
  abstract     = {<p>This study investigated polycyclic aromatic hydrocarbons (PAHs)and soot formation characteristics in laminar jet flames fuelled by primary reference fuels (PRFs)at elevated pressures. Qualitative PAHs and quantitative soot profiles were acquired by using laser-induced fluorescence and laser-induced incandescence, respectively. The backpressure of flames ranged from 1 bar to 5 bar. Proper flames with the volume fraction of iso-octane in PRFs varying between 0% and 100% and flame equivalent ratio varying between 3.0 and 11.4 were stabilised in a pressurised chamber. The effects of backpressure, equivalent ratio and iso-octane ratio on PAHs and soot formation were evaluated. PAHs and soot formation can be promoted by increasing iso-octane ratio, equivalent ratio and backpressure. The data suggest that PAHs with large molecular size are more sensitive to the increase of backpressure compared with those with small molecular size. Backpressure played a positive role in the growth of PAHs size. The averaged soot volume fraction showed an approximate power-law relation with pressure. The measured averaged soot volume fraction was proportional to p<sup>n</sup>. Pressure exponent n was 1.34–2.17, 1.41–2.12 and 1.56–2.20 at equivalent ratios of 6.2, 8.5 and 11.4, respectively.</p>},
  author       = {Liang, Shuai and Li, Zhongshan and Gao, Jinlong and Ma, Xiao and Xu, Hongming and Shuai, Shijin},
  issn         = {0010-2180},
  keyword      = {Backpressure,LIF,LII,PAH,PRF,Soot},
  language     = {eng},
  month        = {08},
  pages        = {363--378},
  publisher    = {Elsevier},
  series       = {Combustion and Flame},
  title        = {PAHs and soot formation in laminar partially premixed co-flow flames fuelled by PRFs at elevated pressures},
  url          = {http://dx.doi.org/10.1016/j.combustflame.2019.05.007},
  volume       = {206},
  year         = {2019},
}