Temperature, velocity, and NO(x)/CO emission measurements in turbulent flames: Effects of partial premixing with central fuel injection

Taewoo Lee, A. Mitrovic, T. Wang

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Characteristics of methane-air turbulent partially premixed flames have been determined through flame imaging, flow velocity, and temperature. NO(x)/CO emission indices from these flames were also measured. Varying amounts of fuel were added to a main premixed stream to control the overall stoichiometry. At equivalence ratios from 1.4 to 2.4, the turbulent partially premixed flames exhibit a double-flame structure with a premixed flame near the burner exit and a secondary diffusion flame at a downstream location. This structure persists even with the flame tip opening as the fuel is added coaxially to increase the overall equivalence ratio. The premixed flame near the burner exit tends to keep the temperature at a high level in the region between the two flames. With the flame tip opening, the temperature in this region decreases. The above flame structure has an important effect on the pollutant emission characteristics from these flames. The NO(x) emission index (EINO(x)) continues to increase gradually for overall equivalence ratio starting from 1.5 up to 10. The CO emission index (EICO), on the other hand, remains nearly constant with respect to the variations in the equivalence ratio, and shows a substantial difference depending on the mixing characteristics of the fuel with the main premixed stream. (C) 2000 by The Combustion Institute.

Original languageEnglish (US)
Pages (from-to)378-385
Number of pages8
JournalCombustion and Flame
Volume121
Issue number1-2
DOIs
StatePublished - Apr 2000

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premixing
fuel injection
turbulent flames
Fuel injection
Carbon Monoxide
flames
Fuel burners
premixed flames
equivalence
Methane
Flow velocity
Stoichiometry
Temperature
temperature
burners
Imaging techniques
Air
diffusion flames
contaminants
stoichiometry

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Fuel Technology
  • Mechanical Engineering

Cite this

Temperature, velocity, and NO(x)/CO emission measurements in turbulent flames : Effects of partial premixing with central fuel injection. / Lee, Taewoo; Mitrovic, A.; Wang, T.

In: Combustion and Flame, Vol. 121, No. 1-2, 04.2000, p. 378-385.

Research output: Contribution to journalArticle

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