期刊
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
卷 29, 期 5, 页码 2259-2267出版社
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-015-0447-9
关键词
Counterflow non-premixed flame; DME; Laser extinction; Laser scattering; Soot; Soot volume fraction
资金
- National Research Foundation of Korea - Korean Government [2010-0004022]
- National Research Foundation of Korea [2010-0004022] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In order to investigate the effect of DME mixing on the number density and size of soot particles, DME was mixed in a counter flow non-premixed ethylene flame with mixture ratios of 5%, 14% and 30%. A laser extinction/scattering technique has been adopted to measure the volume fraction, number density, and mean size of soot particles. The experimental results showed that the highest soot concentrations were observed for flames with mixture ratios of 5% and 14%; however, for a mixture ratio of 30% the soot concentration decreased. Numerical results showed that the concentrations of propargyl radicals (C3H3) at the 5% and 14% ratios were higher than those measured in the ethylene-based flame, and the production of benzene (C6H6) in the 5% and 14% DME mixture flames was also increased. This indicates the crucial role of propargyl in benzene ring formation. These reactions generally become stronger with increased DME mixing, except for Al- + H-2 -> Al + H (-R554) and n-C4H5 + C2H2 -> Al + H (R542). Therefore, it is indicated that adding DME to ethylene flames promotes benzene ring formation. Note that although the maximum C6H6 concentration is largest in the 30% DME mixing flame, the soot volume fraction is smaller than those for the 5% and 14% mixture ratios. This is because the local C6H6 concentration decreases in the relatively low temperature region in the fuel side where soot growth occurs.
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