Topic
Diffusion flame
About: Diffusion flame is a research topic. Over the lifetime, 9266 publications have been published within this topic receiving 233522 citations.
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TL;DR: In this paper, the Damkohler number and the deviations from chemical equilibrium were varied for a number of jet diffusion flames and the resulting effects on the nitric oxide emission index were measured and compared with existing analysis.
170 citations
TL;DR: In this paper, an experimental study on combustion instability is presented with focus on oxy-fuel type combustion, where an acoustic model of the system coupled with a time-lag based flame model made it possible to elucidate the acoustic mode selection in the system as a function of laminar flame speed and Reynolds number.
169 citations
TL;DR: In this paper, a simple laboratory-scale diffusion flame is demonstrated for the synthesis of single-wall nanotubes via a simple single-dimensional diffusion flame, and the results using different hydrocarbon reagents, the effects of dilution with an inert, the role of hydrogen and processes likely responsible for the deactivation of the catalyst particles are illustrated and discussed.
168 citations
01 Jan 1998
TL;DR: In this article, the results of two-dimensional numerical computations of turbulent methane flames using detailed and reduced chemistry are analyzed in the context of a new theory for premixed turbulent combustion for high turbulence intensity.
Abstract: Results of two-dimensional numerical computations of turbulent methane flames using detailed and reduced chemistry are analyzed in the context of a new theory for premixed turbulent combustion for high turbulence intensity. This theory defines the thin reaction zones regime, where the Kolmogorov scale is smaller than the preheat zone thickness, but larger than the reaction zone thickness. The two numerical computations considered in this paper fall clearly within this regime. A lean and a stoichiometric flame are considered. The former is characterized by a large ratio of the turbulence intensity to the laminar burning velocity and the latter by a smaller value of that ratio.
168 citations
15 Dec 2001
TL;DR: In this paper, the surface growth rate of premixed ethylene/air flames with C/O ratios of 0.78-0.98 was found to be due to reduced H atom concentrations as temperatures decrease as a result of radiative heat losses.
Abstract: Abstract Soot formation was studied within laminar premixed ethylene/air flames (C/O ratios of 0.78–0.98) stabilized on a flat-flame burner operating at atmospheric pressure. Measurements included soot volume fractions by both laser extinction and gravimetric methods, temperatures by multiline emission, soot structure by thermophoretic sampling and transmission electron microscopy, major gas species concentrations by sampling and gas chromatography, concentrations of condensable hydrocarbons by gravimetric sampling, and velocities by laser velocimetry. These data were used to find soot surface growth rates and primary soot particle nucleation rates along the axes of the flames. Present measurements of soot surface growth rates were correlated successfully by predictions based on typical hydrogen-abstraction/carbon-addition (HACA) mechanisms of Frenklach and co-workers and Colket and Hall. These results suggest that reduced soot surface growth rates with increasing residence time seen in the present and other similar flames were mainly caused by reduced rates of surface activation due to reduced H atom concentrations as temperatures decrease as a result of radiative heat losses. Primary soot particle nucleation rates exhibited variations with temperature and acetylene concentrations that were similar to recent observations for diffusion flames; however, nucleation rates in the premixed flames were significantly lower than in the diffusion flames for reasons that still must be explained. Finally, predictions of yields of major gas species based on mechanisms from both Frenklach and co-workers and Leung and Lindstedt were in good agreement with present measurements and suggest that H atom concentrations (relevant to HACA mechanisms) approximate estimates based on local thermodynamic equilibrium in the present flames.
168 citations